Photosynthetica - Latest articles
Results 151 to 180 of 347:
Physiological changes in winter wheat genotypes in response to the Zymoseptoria tritici infection
G. MIHAILOVA, Z. STOYANOVA, R. RODEVA, B. BANKINA, G. BIMŠTEINE, K. GEORGIEVA
Photosynthetica 2019, 57(2):428-437 | DOI: 10.32615/ps.2019.054
Some physiological aspects of interactions between wheat and Zymoseptoria tritici were studied by measuring changes in some stress markers, photosynthetic activity, and the extent of thermal energy dissipation. Four winter wheat genotypes varying in their level of resistance, determined on the basis of necrotic leaf area and presence of pycnidia, were inoculated at a seedling stage and measurements were performed at 0, 2, 17, and 23 d after the inoculation. Physiological activity of wheat genotypes showed that keeping the membrane integrity and the extent of oxidative stress is of significant importance for pathogen resistance. It could be suggested...
The higher area-based photosynthesis in Gossypium hirsutum L. is mostly attributed to higher leaf thickness
J.M. HAN, Y.J. ZHANG, Z.Y. LEI, W.F. ZHANG, Y.L. ZHANG
Photosynthetica 2019, 57(2):420-427 | DOI: 10.32615/ps.2019.052
There is a trade-off between leaf structures and photosynthesis physiology. While numerous reports have shown a dif- ference in photosynthesis between Gossypium hirsutum L. (upland cotton) and G. barbadense L. (pima cotton), the potential contribution of leaf structures on this difference was not fully clarified. Here, we investigated the differences in area- and mass-based photosynthetic traits and leaf structures between upland and pima cottons. Our results showed that upland cotton had higher area-based net photosynthetic rate (Parea) than that of pima cotton, which was attributed to the coordination of stomatal...
The role of inoculum identity for growth, photosynthesis, and chlorophyll fluorescence of zinnia plants by arbuscular mycorrhizal fungi under varying water regimes
V. BAGHERI, M.H. SHAMSHIRI, H. ALAEI, H. SALEHI
Photosynthetica 2019, 57(2):409-419 | DOI: 10.32615/ps.2019.048
This experiment aimed to determine effects of three arbuscular mycorrhizal fungi (AMF), i.e., Rhizophagus irregularis, Rhizophagus intraradices, and Funneliformis mosseae, either singly or their mix inoculation on dry mass, photosynthesis, chlorophyll (Chl) fluorescence, leaf pigment contents, and water-use efficiency (WUE) in Zinnia elegans (var. Magellan Red) plants under different water regimes (WR). The greenhouse experiment was performed under a complete randomized design at four different WR [100% of field capacity (FC) as control, 80, 60, and 40% FC]. Our results suggested that arbuscular mycorrhizal symbiosis...
Adaptation of photosynthesis to water deficit in the reproductive phaseof a maize (Zea mays L.) inbred line
H.F. ZHENG, L.F. XIN, J.M. GUO, J. MAO, X.P. HAN, L. JIA, B.Y. ZHENG, C.G. DU, R.W. ELMORE, Q.H. YANG, R.X. SHAO
Photosynthetica 2019, 57(2):399-408 | DOI: 10.32615/ps.2019.047
Photosynthesis is sensitive to water deficit (WD) stress. Maize (Zea mays L.) yield is vulnerable to water stress, especially if it occurs during the reproductive stage. In this study, the expression patterns of photosynthesis-related genes, together with photosynthetic gas-exchange and fluorescence parameters were investigated in a maize inbred line exposed to 50% of field water capacity (moderate WD) for 15 d after tassel emergence. The results demonstrated that WD down-regulated expression of psbA, psbB, psbC, psbP, psaA, psaB, and cab, especially at later periods of WD stress. Besides, with the increased WD stress, the steady...
Intelligent image analysis for retrieval of leaf chlorophyll content of rice from digital images of smartphone under natural light
P. JAGAN MOHAN, S. DUTTA GUPTA
Photosynthetica 2019, 57(2):388-398 | DOI: 10.32615/ps.2019.046
The present study describes a new imaging method to acquire rice leaf images under field conditions using a smartphone and modeling approaches to retrieve the leaf chlorophyll (Chl) content from digitized images. Pearson's correlation of image-based color indices of the relative Chl content measured with Soil Plant Analysis Development (SPAD) indicated the suitability of the color models RGB, rgb, and DGCI-rgb. Among the linear regression models, the models based on mean brightness ratio (rgb) alone or in combination with a dark green color index (DGCI-rgb) show a good correlation between the predicted Chl content and relative Chl content. A...
Allelopathic effects of phenolic acids on seedling growth and photosynthesis in Rhododendron delavayi Franch.
Y.H. FU, W. X. QUAN, C.C. LI, C.Y. QIAN, F.H. TANG, X.J. CHEN
Photosynthetica 2019, 57(2):377-387 | DOI: 10.32615/ps.2019.045
The effects of different concentrations of ferulic acid, chlorogenic acid, and protocatechuic acid were studied in a pot experiment to assess the response of Rhododendron delavayi seedlings. The results showed that three kinds of phenols promoted increases in chlorophyll (Chl) a, Chl b, total Chl, and carotenoid contents, but inhibited the accumulation of biomass. Low concentrations of ferulic acid significantly inhibited stomatal opening, the stomatal opening ratio, stomatal length and width. Chlorogenic acid and the moderate and high concentrations of ferulic acid also significantly inhibited stomatal density. Ferulic...
Effects of salicylic acid on photosynthetic activity and chloroplast morphology under light and prolonged darkness
P. POÓR, P. BORBÉLY, N. BÓDI, M. BAGYÁNSZKI, I. TARI
Photosynthetica 2019, 57(2):367-376 | DOI: 10.32615/ps.2019.040
Salicylic acid (SA) is a key component of plant defence, which exerts a concentration-dependent effect on photosynthesis under multi-faceted influence of light. Photosynthetic activities and chloroplast morphology were studied in tomato plants after treatment with a sublethal, 0.1 mM, and a cell death-inducing, 1 mM concentrations of SA under normal photoperiod during light phase and after a prolonged dark phase. SA (1 mM) decreased the maximal (Fv/Fm) and effective quantum yields of PSII [Y(II)] and PSI [Y(I)] under both environmental conditions, however, the photoprotective processes were not significantly...
Extended temperature optimum of photosynthetic reaction centers in Rhodobacterales
D. KAFTAN, H. MEDOVÁ, V. SELYANIN, K. KOPEJTKA, M. KOBLÍŽEK
Photosynthetica 2019, 57(2):361-366 | DOI: 10.32615/ps.2019.039
Temperature is one of the most important physical factors affecting microbial and biochemical processes. We investigated the performance of photosynthetic apparatus of marine photoheterotrophic bacterium Dinoroseobacter shibae under various temperatures. The primary photochemistry and electron transport was measured using variable infra-red fluorometry in the cells grown between 8-35°C. It was found that the photosynthetic electron transport had a broad temperature optimum between 25-50°C. Moreover, the primary charge separation stayed functional even after rising temperature up to 55°C. The same phenomenon was observed also in other phototrophic...
Tolerance of the photosynthetic apparatus in recombinant lines of wheat adapting to water stress of varying intensity
S.V. OSIPOVA, A.V. PERMYAKOV, M.D. PERMYAKOVA, E.G. RUDIKOVSKAYA
Photosynthetica 2019, 57(1):160-169 | DOI: 10.32615/ps.2019.007
The stress tolerance index (STI) of leaf photosynthetic parameters was analysed in recombinant introgression lines of spring wheat (Triticum aestivum L.) grown under water stress of varying intensity in the simulated conditions of soil and soil-atmospheric drought. STI for the chlorophyll content was >1 regardless of experimental conditions. Carotenoids content increased only when soil drought occurred. Maximum quantum yield of PSII photochemistry was the most stable and stress-resistant parameter. Minimal fluorescence yield of the dark-adapted state was only sensitive to soil-atmospheric drought. Nonphotochemical quenching decreased under...
Editorial 2019Editorial
Helena Synková
Photosynthetica 2019, 57(1):i
At the end of 2018, Photosynthetica was pressed to close one period of its existence under wings of the international giant, Springer Nature, which had arranged our distribution since 1997. Starting January 2019, Photosynthetica has become an open-access journal with our old, but ever present publisher, Institute of Experimental Botany, ASCR, Prague. We had to switch also from our previous online peer-review system, ScholarOne, into the new one, Actavia.
Photosynthetic capacity, osmotic adjustment and antioxidant system in sugar beet (Beta vulgaris L.) in response to alkaline stress
C.L. ZOU, Y.B. WANG, L. LIU, D. LIU, P.R. WU, F.F. YANG, B. WANG, T. TONG, X.M. LIU, C.F. LI
Photosynthetica 2019, 57(1):350-360 | DOI: 10.32615/ps.2019.010
Photosynthetic characteristics of sugar beet cultivars KWS0143 and Beta464 were studied under alkaline conditions, including 0 (A0, control), 25 (A1), 50 (A2), 75 (A3), and 100 mM of mixed alkali (Na2CO3:NaHCO3, 1:2). A2, A3, and A4 reduced net photosynthetic rate (PN), stomatal conductance, and transpiration rate, but rose intercellular CO2 concentration. Reduction in PN occurred probably due to nonstomatal limitation. The decrease in efficiency of photosynthetic electron transport might be the main reason for the...
Comprehensive effects of exogenous salicylic acid and light on chlorophyll fluorescence parameters and photosynthetic oxygen evolution in Ulva prolifera
P.L. ZHUO, Y.H. LI, J.L. ZHONG, M.S. ZHENG, W.R. ZHU, N.J. XU
Photosynthetica 2019, 57(1):342-349 | DOI: 10.32615/ps.2019.035
Ulva prolifera is one of the causative species of green tides. Salicylic acid (SA) alleviated the high-temperature damage by up-regulating a portion of antioxidant-related proteins, however, little is understood regarding the impacts of SA under high light in this species. In order to study the regulation effects of SA on U. prolifera under different light conditions, we grew this species under three SA concentrations (0, 2.5, 5.0 µg mL-1) and three light levels [high light (HL): 400 μmol(photon) m-2 s-1, medium light (ML): 160 μmol(photon) m-2 s-1, and low light (LL): 70 μmol(photon)...
Identification of a GLDH-overexpressing Arabidopsis mutant and its responses to high-light stress
X.T. ZHENG, X.H. ZHANG, Y.Z. WANG, M.L. CAI, M. LI, T.J. ZHANG, C.L. PENG
Photosynthetica 2019, 57(1):332-341 | DOI: 10.32615/ps.2019.038
Ascorbic acid (AsA) is an important antioxidant protecting plant against environmental stresses. L-galactono-1,4-lactone dehydrogenase (GLDH) is a key enzyme in AsA synthesis pathway. To investigate the roles of AsA in mitigating high light (HL) damage, Arabidopsis GLDH mutants SALK_060087 and SALK_008236 with altered GLDH-expression were screened for homozygotes. No homozygotes were identified from SALK_060087, but most individuals of the SALK_008236 line (GLDH-236OE) were GLDH-overexpressing homozygous mutants accumulating more AsA than wild type (WT). An investigation of the physiological responses to HL demonstrated...
Transcriptome analysis revealed the effect of a combination of red and blue LEDs on photosynthesis, chlorophyll and carotenoid biosynthesis in Brassica campestris L.
T. ZHANG, Y.Y. SHI, F.Z. PIAO, N.S. DU, Z.Q. SUN
Photosynthetica 2019, 57(1):320-331 | DOI: 10.32615/ps.2019.034
Here, we analyzed the transcriptomes of Brassica campestris L. ssp. chinensis Makino under the treatment of a combination of red (R) and blue (B) light. In total, 5,643 differentially expressed genes (DEGs) were found under the R and B combination compared with the white light. An analysis of the DEGs enriched in photosynthesis and antenna proteins showed that there were many more upregulated subunits in PSII than those in PSI. The DEGs encoding the cytochrome b6f complex, photosynthetic electron transport, ATP synthases, and key genes involved in chlorophyll (Chl) and carotenoids (Car) biosynthesis were also...
Intraspecific variation in photosynthetic nitrogen-use efficiency is positively related to photosynthetic rate in rice (Oryza sativa L.) plants
M. YE, S.B. PENG, Y. LI
Photosynthetica 2019, 57(1):311-319 | DOI: 10.32615/ps.2019.011
To explore the natural variation in leaf photosynthesis and investigate its relations with leaf nitrogen (N) status, 121 rice cultivars were pot-grown and their leaf photosynthetic rate (PN) and N content were measured on the flag leaves at heading stage before anthesis. The results showed that there were substantial natural variations in PN, leaf N content based on leaf area and leaf mass, and photosynthetic N-use efficiency (PNUE). PN ranged between 15.4 and 32.6 μmol m-2 s-1; PN and PNUE of four widely grown cultivars in China were significantly lower...
Shading of mature leaves systemically regulates photosynthesis and leaf area of new developing leaves via hormones
Y.S. WU, W.Z. GONG, Y.M. WANG, W.Y. YANG
Photosynthetica 2019, 57(1):303-310 | DOI: 10.32615/ps.2019.021
In order to explore whether leaf area of developing leaves was regulated by systemic irradiance signal from mature leaves, we investigated the leaf area, leaf anatomy, photosynthesis, auxin, gibberellin, and cytokinin contents of new developing leaves in soybean growing under conditions of shaded mature leaves (MS), shaded whole plants (WS), and under full sunlight (NS). The results showed that developing leaves under MS exhibited the higher leaf area and leaf mass than that of WS. Blade thickness, palisade tissue thickness, sponge tissue thickness, cell size, cell numbers, net photosynthetic rate, stomatal conductance, transpiration rate, and cytokinin...
The nutritional status and fluorescence characteristics of maize cultivars with different chlorophyll content and yields
Y. WANG, Z.C. AN, R.K. Li, X. YANG, Y.F. HUANG, R.X. SHAO, Y.L. YE
Photosynthetica 2019, 57(1):295-302 | DOI: 10.32615/ps.2019.032
Chlorophyll (Chl) is generally positively related to corn grain yields; however, light-leaf-colored maize may also achieve high yields. Thus, Chl is seemingly not a key parameter for maize producers. Modern maize cultivars (55) were divided into four types, based on grain yields and ear leaf SPAD readings. The results revealed that there was no correlation between the SPAD readings and corn grain yields across different maize cultivars. High-yield maize possessed higher nitrogen, phosphorus, and potassium accumulation and utilization compared to that of low-yield maize; the N-transport efficiency of low yield and high SPAD was the lowest among various...
Effects of exogenous glucose and sucrose on photosynthesis in triticale seedlings under salt stress
L.H. WANG, G.L. LI, S. WEI, L. J. LI, S.Y. ZUO, X. LIU, W.R. GU, J. LI
Photosynthetica 2019, 57(1):286-294 | DOI: 10.32615/ps.2019.030
Salinization disturbs metabolic processes of plants and results in reduced growth and productivity. In our study, the Dongnong 8809 variety of triticale (×Triticosecale Wittmack) was evaluated for its physiological responses to salt stress during the seedling stage. We evaluated biomass production, relative chlorophyll content, chlorophyll fluorescence, and leaf gas-exchange parameters. Our results indicated that salt stress greatly reduced matter accumulation, SPAD value, photosynthetic capacity. However, seedlings treated with exogenous sugars showed significantly enhanced matter accumulation, SPAD value, quantum yield of PSII, electron transport...
Diurnal and seasonal variations in the photosynthetic performance and chlorophyll fluorescence of cassava 'Rayong 9' under irrigated and rainfed conditions
K. VONGCHAROEN, S. SANTANOO, P. BANTERNG, S. JOGLOY, N. VORASOOT, P. THEERAKULPISUT
Photosynthetica 2019, 57(1):268-285 | DOI: 10.32615/ps.2019.027
Diurnal photosynthesis responses of cassava cultivar Rayong 9 ('RY9') three months after planting, grown in a field conditions under irrigated and rainfed conditions, were evaluated during the rainy, cool, and hot seasons. Under the mild conditions of the rainy and cool seasons, net photosynthetic rates (PN) increased in parallel with light intensity and attained the maximum at 13.00 or 11.00 h. In the hot season, PN attained the prominent peak at 9.00 h, after which stomatal conductance decreased rapidly coordinated with declining PN and nonphotochemical quenching was enhanced. Photosynthetically...
Allocation pattern, photosynthetic performance and sugar metabolism in hydroponically grown seedlings of loquat (Eriobotrya japonica Lindl.) subjected to salinity
M.-I.N. SOTIRAS, I.E. PAPADAKIS, M. LANDI, G. TSANIKLIDIS, P.I. TSIANTAS, M. PSYCHOYOU
Photosynthetica 2019, 57(1):258-267 | DOI: 10.32615/ps.2019.018
Hydroponically grown loquat seedlings were subjected to increasing NaCl concentrations (0, 12, 24, and 48 mM) for 42 d. At the whole plant level, Na+ and Cl- accumulated proportionally to the salt treatments; however, Na+ accumulated prevalently in leaves whilst Cl- accumulated prevalently in stems. Reduction of leaf biomass was only observed in seedlings grown with 48 mM NaCl, whereas net photosynthesis declined along with increasing NaCl concentration and salinity led to general accumulation of glucose, reduction of mannitol and sorbitol, and changes in pigment composition in loquat leaves. Increasing level...
Interactive effects of temperature and phosphorus nutrition on soybean: leaf photosynthesis, chlorophyll fluorescence, and nutrient efficiency
S.K. SINGH, V.R. REDDY, D.H. FLEISHER, D.J. TIMLIN
Photosynthetica 2019, 57(1):248-257 | DOI: 10.32615/ps.2019.036
An experiment was conducted to assess interactive effects of temperature (22, 26, 30, and 34°C daily mean T) and phosphorus (P) fertilization (sufficient, 0.5 mM, and deficient, 0.08 mM P) on soybean physiological traits. The P deficiency decreased leaf P concentration over approximately 50% across temperature regimes. However, a marked decrease in physiological traits under P deficiency was primarily observed below and at optimum temperature (26°C) but not at warmer temperatures. This resulted in a significant P × T interaction for parameters such as net photosynthetic rate (PN), stomatal conductance, quantum yield of PSII (ΦPSII),...
Genotypic differences in leaf gas exchange and growth responses to deficit irrigation in reticulatus and inodorus melons (Cucumis melo L.)
S.P. SHARMA, D.I. LESKOVAR, K.M. CROSBY
Photosynthetica 2019, 57(1):237-247 | DOI: 10.32615/ps.2019.022
Leaf gas exchange and growth responses of three melon cultivars, i.e., Mission, Da Vinci (var. reticulatus), and Super Nectar (var. inodorus) to two irrigation regimes, 50 and 100% crop evapotranspiration (ETc) were investigated under water-limited conditions of southwest Texas. In 2012, deficit irrigation (50% ETc) significantly decreased above-ground biomass, leaf area, leaf number, and specific leaf area, while leaf gas exchange, relative water content, water potential, chlorophyll fluorescence (Fv/Fm), and chlorophyll content (SPAD index) were not affected. However, in the drier year 2011, deficit irrigation...
Activation state of Rubisco decreases with the nitrogen accumulation during the reproductive stage in soybean [Glycine max (L.) Merr.]
K. SAKODA, S. SUZUKI, H. FUKAYAMA, Y. TANAKA, T. SHIRAIWA
Photosynthetica 2019, 57(1):231-236 | DOI: 10.32615/ps.2019.002
The CO2 assimilation rate, N content, Rubisco activation state, and protein distribution to Rubisco and Rubisco activase in the leaf were analyzed for four soybean genotypes at two growth stages under field conditions. The CO2 assimilation rate was largely constant except for one genotype during the reproductive stage. Rubisco activation state significantly decreased with the increase of N content during this period in three of four genotypes. When standardized by total soluble protein amount, Rubisco activase amount was constant during this period in three genotypes. The results in the present study showed the deactivation of...
Machine learning in determination of water saturation deficit in wheat leaves on basis of Chl a fluorescence parameters
K. RYBKA, M. JANASZEK-MAŃKOWSKA, P. SIEDLARZ, D. MAŃKOWSKI
Photosynthetica 2019, 57(1):226-230 | DOI: 10.32615/ps.2019.017
Water saturation deficit (WSD) is a parameter commonly used for detection of plant tolerance to temporary water shortages. However, this parameter does not meet criteria set for screening. On the other hand, measurement of chlorophyll (Chl) a fluorescence is a fast and high-throughput method. This work presents the application of learning systems to set up a model between WSD and Chl a fluorescence parameters allowed for development of a new screening test. Multilayer perceptron (MLP) was trained to predict WSD values on the basis of Chl a fluorescence. The best MLP consisted of three inputs: maximal quantum yield of PSII photochemistry,...
Morphological, anatomical and physiological traits of Euryodendron excelsum as affected by conservation translocation (augmentation vs. conservation introduction) in South China
H. REN, H.L. YI, Q.M. ZHANG, J. WANG, X.Y. WEN, Q.F. GUO, H. LIU
Photosynthetica 2019, 57(1):217-225 | DOI: 10.32615/ps.2019.024
Euryodendron excelsum is a rare and endangered evergreen tree in South China. We conducted two experimental translocations (augmentation and conservation introduction) on this species and assessed morphological, anatomical and physiological traits of leaves after translocation. The introduction plants showed smaller specific leaf area, less developed palisade tissues, smaller palisade/spongy tissue ratio, stomata density and anthocyanin content, lower values of maximal quantum yield of PSII photochemistry, photochemical quenching coefficient, net photosynthetic rate, light-saturated net photosynthetic rate, light-saturation point, but higher light-compensation...
Phytotoxic effect of silver nanoparticles in Triticum aestivum: Improper regulation of photosystem I activity as the reason for oxidative damage in the chloroplast
A. RASTOGI, M. ZIVCAK, D.K. TRIPATHI, S. YADAV, H.M. KALAJI
Photosynthetica 2019, 57(1):209-216 | DOI: 10.32615/ps.2019.019
Silver nanoparticles (AgNPs) are used in several industries and their continuous release into environment can damage the ecosystem. Our study observed the impact of two concentrations of AgNPs (1 and 5 mM) on wheat seedlings. In this study, the treatment of AgNPs was found to have a significant impact on growth parameters, such as root and shoot length of wheat seedlings, in addition to that biochemical parameters, such as activity of catalase, glutathione, flavonoid, and chlorophyll concentrations, were also affected. AgNPs apparently suppressed the photosynthetic activity of the seedlings, with a clear destruction of photosystems at 5 mM concentration....
Leaf rolling as indicator of water stress in Cistus incanus from different provenances
G. PUGLIELLI, L. GRATANI, L. VARONE
Photosynthetica 2019, 57(1):202-208 | DOI: 10.32615/ps.2019.014
Leaf movements such as leaf rolling affect plant physiological performance by reducing light capture. The relationship between leaf rolling and physiological traits under imposed water stress conditions was analyzed in two population of Cistus incanus. We tested the hypothesis that leaf rolling reflected physiological changes occurring during water stress irrespective of the different acclimation in order to cope with water stress. On the whole, our results confirmed our hypothesis since leaf rolling significantly reflected physiological activity changes. Moreover, leaf rolling might be involved in protecting the PSII complex under water...
Changes in foliar epicuticular wax and photosynthesis metabolism in evergreen woody species under different soil water availability
S. PEREIRA, K. FIGUEIREDO-LIMA, A.F. M. OLIVEIRA, M.G. SANTOS
Photosynthetica 2019, 57(1):192-201 | DOI: 10.32615/ps.2019.013
Epicuticular waxes (EW) are important for plant physiology as a protective barrier against water loss. Thus, the main goal of this study was to evaluate the ecophysiological performance of Cynophalla flexuosa, an evergreen woody species, under different foliar EW contents. The study was conducted during three periods throughout the year in a seasonally dry tropical forest area. The xylem water potential decreased to 70% at midday. The main EW components were n-alkane chains, effective in keeping the cuticle impermeability. We analyzed intact leaves and leaves with EW removed. C. flexuosa did not alter its photosynthetic...
Brassinosteroids increase electron transport and photosynthesis in soybean plants under water deficit
Y.C. PEREIRA, W.S. RODRIGUES, E.J.A. LIMA, L.R. SANTOS, M.H.L. SILVA, A.K.S. LOBATO
Photosynthetica 2019, 57(1):181-191 | DOI: 10.32615/ps.2019.029
Drought frequently results in significant losses in agricultural systems, including the soybean yield. Brassinosteroids exhibit multiple actions on essential processes, including chlorophyll fluorescence and gas exchange. Considering that the electron transport rate (ETR) into photosystems can exercise interference on net photosynthetic rate (PN), this research aims to determine whether 24-epibrassinolide (EBR) affects electron transport and find out if there is any repercussion on photosynthesis in soybean plants affected by the water deficit. The experiment was performed using a randomized factorial design, with two water conditions...
Chlorophyll fluorescence and initial growth of two liana species, Cuspidaria sceptrum (Cham.) L.G. Lohmann and Fridericia florida (DC) L.G. Lohmann, under changes of natural light conditions
S.M. PAULA, M.A. BOSELLI, M.C. SANCHES
Photosynthetica 2019, 57(1):170-180 | DOI: 10.32615/ps.2019.004
The physiological alterations as well as the growth were evaluated in seedlings of two liana species, Cuspidaria sceptrum and Fridericia florida, which were transferred from shade to full sunlight conditions. We cultivated one group of seedlings under full sunlight, the second group under natural shade beneath canopy, and the third group was transferred from shade to full sunlight. Reductions on the potential quantum yield of PSII (Fv/Fm) during predawn was detected under full sunlight, but these responses were more pronounced when the plants were transferred from shade to full sunlight. C. cuspidaria...