Photosynthetica - Latest articles
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A comparison of the photosynthesis response to arsenic stress in two Pteris cretica ferns
V. ZEMANOVÁ, D. PAVLÍKOVÁ, F. HNILIČKA, M. PAVLÍK, H. ZÁMEČNÍKOVÁ, T. HLAVSA
Photosynthetica 2021, 59(1):228-236 | DOI: 10.32615/ps.2021.014 
The present study investigated the effect of arsenic (As) on photosynthesis and other selected physiological parameters in two ferns. The ferns (Pteris cretica 'Albo-lineata' and 'Parkerii') subjected to As doses of 100 and 250 mg kg-1 for three months, showed different As accumulation, which was higher in Albo-lineata. Overall, the obtained results indicated significant differences between studied ferns. The individual effects of As and growing period on all parameters were very variable. However, As doses generally caused a decrease of net photosynthetic rate, stomatal conductance, transpiration rate, maximum quantum yield of PSII,...
Improving photosynthetic characteristics and antioxidant enzyme activity of capsule wall and subtending leaves increases cotton biomass under limited irrigation system
N.N. LI, F. SHI, H.Y. GAO, A. KHAN, F.Y. WANG, X.H. KONG, H.H. LUO
Photosynthetica 2021, 59(1):215-227 | DOI: 10.32615/ps.2021.012
The photosynthetic performance of the canopy boll-leaf system (BLS) reflects the material and energy exchange abilities between plant and external environment. A two-year field experiment determined the response to irrigation regimes [600 (W1), 480 (W2), and 360 (W3) m3 ha-1] of cotton BLS physio-biochemical traits. Decreasing irrigation, photochemical quenching coefficient, the electron transfer rate of PSII, chlorophyll, and stomata width of the BLS decreased; nonphotochemical quenching (NPQ), the activity of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), hydrogen peroxide...
Species-specific performance and trade-off between growth and survival in the early-successional light-demanding group
T.O. VIEIRA, L.S. SANTIAGO, I.A. PESTANA, E. ÁVILA-LOVERA, J.L.A. SILVA, A.P. VITÓRIA
Photosynthetica 2021, 59(1):203-214 | DOI: 10.32615/ps.2021.013
We investigated if high irradiance imposes stress conditions and differently affects the performance of species from the early-successional light-demanding group and if the costs associated with plasticity underlie the trade-off between growth and survival. Survival, growth, chlorophyll a fluorescence, and carbon stable isotopic ratio (δ13C) were measured in seedlings of four tree species in a restoration area in the Atlantic Forest under full-sun exposure and partial shading treatments. The maximal quantum yield of PSII indicated stress conditions mainly in the full-sun exposure treatment (values from 0.72 to 0.81). The δ13C...
Uniconazole and nitrogen fertilization trigger photosynthesis and chlorophyll fluorescence, and delay leaf senescence in maize at a high population density
I. AHMAD, S. AHMAD, M. KAMRAN, X.N. YANG, F.J. HOU, B.P. YANG, R.X. DING, T. LIU, Q.F. HAN
Photosynthetica 2021, 59(1):192-202 | DOI: 10.32615/ps.2021.011
Reducing the leaf senescence rate could improve the grain yield in maize. In the present study, maize seeds were treated with uniconazole at concentrations of 0 and 25 mg kg-1, and nitrogen was applied at 0, 150, and 225 kg ha-1 to maize crop planted at a density of 105,000 plants ha-1. Applying uniconazole and nitrogen reduced the leaf senescence rate by increasing the leaf area per plant, chlorophyll content, net photosynthetic rate, stomatal conductance, and transpiration rate. Uniconazole and nitrogen increased the electron transport rate, photochemical quenching coefficient, variable fluorescence, maximal...
Quantifying light response of photosynthesis: addressing the long-standing limitations of non-rectangular hyperbolic model
Z.P. YE, S.H. DUAN, X.M. CHEN, H.L. DUAN, C.P. GAO, H.J. KANG, T. AN, S.X. ZHOU
Photosynthetica 2021, 59(1):185-191 | DOI: 10.32615/ps.2021.009
Light intensity (I) fluctuates rapidly and is the most important environmental factor affecting photosynthesis. Accurate characterization of light-response curve of leaf-scale photosynthesis (PN-I curve) is fundamental for understanding PN-I relations at the whole-plant and ecosystem scales. A robust PN-I model should be accurate in reproducing PN-I curves over light-limited, light-saturated, and photoinhibitory I levels, and ideally returning key quantitative traits defining the curves, including initial slope of increase (α), dark...
Physiological changes of three woody plants exposed to progressive salt stress
Y. LU, F.J. ZENG, X.Y. LI, B. ZHANG
Photosynthetica 2021, 59(1):171-184 | DOI: 10.32615/ps.2021.007
The saline character of water imposes restrictions on plant growth and survival in the Taklamakan Desert, China. Experiments were conducted on woody plant species, Tamarix ramosissima, Populus euphratica, and Haloxylon ammodendron grown under different levels of salinity to elucidate their adaptation to a saline environment. H. ammodendron accumulated large amounts of Na+ and Cl- in leaves. P. euphratica restricted redundant Na+ and Cl- transport to the shoots treated with lower NaCl concentrations. Na+ in leaves of T. ramosissima accumulated significantly...
Photosynthesis of grape leaves with 'OSC' trellis and cordon based on data model fitting
F.C. ZHANG, H.X. ZHONG, X.M. ZHOU, S.A. HAN, M. WANG, J.Z. HAO, X.Y. WU, M.Q. PAN
Photosynthetica 2021, 59(1):160-170 | DOI: 10.32615/ps.2021.010
The photosynthetic parameters of 'Flame Seedless' and 'Red Globe' grape leaves in oblique single cordon (OSC) vine along the ditch and traditional single cordon (TSC) vine were determined using the CIRAS-2 photosynthetic system. The photosynthesis of leaves was studied using the Gaussian multi-peak model, Yezipiao's model, and the extended Freundlich's model fitting methods. The results showed that the correlation coefficients of the three data models fitting the field data were between 0.89 and 0.97. The three models can be used to analyze photosynthesis of grape leaves. In this paper, the physical significance of indicators obtained by extended...
Inhibition of photosynthesis in Melia azedarach and Ligustrum lucidum induced by manganese toxicity using OJIP chlorophyll a fluorescence transient
M.S. LIU, X.H. HUANG, R.J. WANG, H.Y. XU, F. ZHU
Photosynthetica 2021, 59(1):148-159 | DOI: 10.32615/ps.2021.006
Manganese (Mn) excess is a major abiotic stress for plant growth. In the present study, we investigated the effects of Mn on photosynthesis in Ligustrum lucidum and Melia azedarach leaves using chlorophyll fluorescence transients. Both plant species were exposed to two Mn concentrations (0.5 and 1 mmol) for 10 and 30 d. Results showed that excess Mn significantly inhibited photosynthesis. With the increase of Mn concentration and stress time, the inhibition was more serious. Mn stress impaired PSII at the donor and the acceptor side by damaging the oxygen-evolving complex and limiting electron transport downstream of QA in...
Adaptation of Amorpha fruticosa to different habitats is enabled by photosynthetic apparatus plasticity
S. MLINARIĆ, T. ŽUNA PFEIFFER, Lj. KRSTIN, D. ŠPOLJARIĆ MARONIĆ, M. OŽURA, F. STEVIĆ, M. VARGA
Photosynthetica 2021, 59(1):137-147 | DOI: 10.32615/ps.2021.008
The rapid growth and spreading of invasive plant species could be related to their efficient photosynthesis performance. We analysed and compared photosynthetic efficiency of invasive indigo bush (Amorpha fruticosa L.) and noninvasive native Quercus robur L., Alnus glutinosa L., Populus alba L., and Cornus sanguinea L. with the overlapping distribution. The study was performed at two lowland areas at the beginning of the vegetation season (May) and during the flowering period (July). At both study sites, indigo bush showed better photosynthetic performance than native plants. Negative L- and K-bands in indigo bush...
Potassium deficiency impact on the photosynthetic apparatus efficiency of radish
M. KUSAKA, H.M. KALAJI, G. MASTALERCZUK, P. DĄBROWSKI, K. KOWALCZYK
Photosynthetica 2021, 59(1):127-136 | DOI: 10.32615/ps.2020.077
Potassium is an essential nutrient for plants and its limited resources impose the improvement of the fertilizer-use efficiency. To address this issue, it is important to understand its roles in the photosynthesis and to provide a quick, noninvasive method for diagnosing its deficiency in plants. The impact of potassium deficiency on the photochemical phase of photosynthesis has not been well understood. In this work, we present the K+-deficiency effect on gas exchange, chlorophyll content, and electron transport chain in two hybrid cultivars of radish. Our results showed that one of the cultivars proved to be tolerant and maintained the...
Adaptability variations and differences in photoprotection of young leaves of two tree species of subtropical forest to the light environment
Z.-C. YU, Y.-N. LUO, W.-Y. SHI, W. LIN, C.-L. PENG
Photosynthetica 2021, 59(1):116-126 | DOI: 10.32615/ps.2021.004
In the high-light environment, young leaves accumulate anthocyanins as a photoprotection strategy. However, anthocyanin biosynthesis-related enzymes gene sequence is still unknown in the leaves of subtropical forest plants. There are thus few reports on the relationship between the expression level of these genes and photoprotection. In this study, Machilus chinensis and Castanopsis chinensis were taken as plant material in a subtropical forest. Non-full-length nucleotide sequences of chalcone synthase, dihydroflavonol 4-reductase, anthocyanin synthase, and β-tubulin gene were obtained by homologous and...
Heterosis effects on photosynthesis of upland cotton (Gossypium hirsutum) hybrid cultivars
H. ZHOU, Y. ZHANG, W.Q. DONG, X.M. XU, C.M. TANG
Photosynthetica 2021, 59(1):106-115 | DOI: 10.32615/ps.2020.081
The relationship between the environment and heterosis effects on the photosynthesis of upland cotton (Gossypium hirsutum) is unknown. No significant differences for net photosynthetic rate (PN), stomatal conductance (gs), and transpiration rate (E) were found between two studied cotton varieties Siza 3 and Zhongmiansuo 48. The PN and gs of Siza 3 demonstrated heterosis compared with its parents. The higher the effective photosynthetic radiation and CO2 concentration were, the more obvious the over better-parent heterosis (OH) of the PN...
Responses of thallus anatomy and chlorophyll fluorescence-based photosynthetic characteristics of two Antarctic species of genus Usnea to low temperature
J. HÁJEK, A. HOJDOVÁ, K. TRNKOVÁ, P. VÁCZI, M. BEDNAŘÍKOVÁ, M. BARTÁK
Photosynthetica 2021, 59(1):95-105 | DOI: 10.32615/ps.2021.002
Biometrical parameters of two fruticose lichens from Antarctica (Usnea aurantiaco-atra, U. sphacelata) were studied using thallus cross-sections at basal, middle, and apical parts of thallus. The thallus diameter (TD), the thickness of the upper cortex (UCT), distribution of symbiotic alga (Trebouxia sp.) in the algal layer, the thickness of medulla (MT), central cord diameter, and area (CCD, CCA) were measured. U. sphacelata had comparable relative UCT (0.080-0.110, relative to diameter) to U. aurantiaco-atra (0.085-0.130). The relative MT was higher in U. sphacelata (0.240-0.300) than U. aurantiaco-atra...
Exogenous salicylic acid ameliorates waterlogging stress damages and improves photosynthetic efficiency and antioxidative defense system in waxy corn
J. WANG, S.H. SHI, D.Y. WANG, Y. SUN, M. ZHU, F.H. LI
Photosynthetica 2021, 59(1):84-94 | DOI: 10.32615/ps.2021.005
Salicylic acid (SA) is an endogenous growth regulator. It is vital for the growth and development, photosynthesis, disease resistance, and abiotic stress tolerance of plants. This study aimed to investigate the effects of exogenous SA on photosynthetic characteristics and antioxidant system in the four-leaf-stage waxy corn inbred seedlings SY-MY13 (waterlogging-resistant) and SY-XT1 (waterlogging-sensitive) under waterlogging stress. Waterlogging stress negatively influenced the morphology, plant height, biomass, photosynthetic characteristics, and chlorophyll content of waxy corn seedlings, obstructing their growth and development. SY-MY13 exhibited...
Photosynthetic activity of Triticum dicoccum × Triticum aestivum alloplasmic lines during vegetation in connection with productivity traits under varying moister conditions
N.V. TERLETSKAYA, V.YU. STUPKO, N.A. ALTAYEVA, N.O. KUDRINA, I.V. BLAVACHINSKAYA, M.S. KURMANBAYEVA, U. EREZHETOVA
Photosynthetica 2021, 59(1):74-83 | DOI: 10.32615/ps.2021.003
Drought is a key stressor under global climate change conditions around the world. Triticum dicoccum Shuebl is a species with high potential drought tolerance. Photosynthesis is the primary physiological process affected by water deficit. Rapid light curves (RLCs), recorded using PAM-fluorometers, appear suitable for drought tolerance determination in breeding material. Chlorophyll fluorescence parameters at different vegetation stages, morphophysiological traits, and their relationship with the productivity were analyzed in nine alloplasmic lines (allolines) of T. dicoccum Shuebl × T. aestivum L. partially exposed to drought...
Performing gas-exchange measurements on excised branches - evaluation and recommendations
J.E.C. MISSIK, A.C. OISHI, M.C. BENSON, V.J. MERETSKY, R.P. PHILLIPS, K.A. NOVICK
Photosynthetica 2021, 59(1):61-73 | DOI: 10.32615/ps.2020.079
In forest canopies, it is common to perform leaf-level gas-exchange measurements on recently excised branches, often without testing for excision-related biases. We conducted a formal test of excision effects using gas-exchange measurements from cut and uncut canopy branches of three deciduous hardwoods - sugar maple (Acer saccharum Marsh.), tulip poplar (Liriodendron tulipifera L.), and white oak (Quercus alba L.). Across all species, excision immediately reduced photosynthesis and stomatal conductance by 27-62% relative to pre-excision rates. In white oak, which had particularly long (> 100 cm) vessels, gas exchange was more...
Stomatal, mesophyll and biochemical limitations to soil drought and rewatering in relation to intrinsic water-use efficiency in Manchurian ash and Mongolian oak
K. ZHU, F.H. YUAN, A.Z. WANG, J.B. WU, D.X. GUAN, C.J. JIN, J. FLEXAS, C.J. GONG, H.X. ZHANG, Y.S ZHANG
Photosynthetica 2021, 59(1):49-60 | DOI: 10.32615/ps.2020.084
The balance between stomatal and mesophyll conductance has been reported to directly influence intrinsic water-use efficiency (WUEi), but it is unclear whether variations in stomatal and mesophyll limitations (lsc and lm, respectively) affect WUEi during soil drought and rewatering. Limitations (lsc, lm and biochemical limitation, lb) and WUEi were measured in Manchurian ash (Fraxinus mandshurica Rupr.) and Mongolian oak (Quercus mongolica Fish. ex Ledeb) saplings exposed to two levels of water stress (moderate and...
Chlorophyll retention caused by STAY-GREEN (SGR) gene mutation enhances photosynthetic efficiency and yield in soybean hybrid Z1
P. WANG, S.Y. HOU, H.W. WEN, Q.Z. WANG, G.Q. LI
Photosynthetica 2021, 59(1):37-48 | DOI: 10.32615/ps.2020.076
To study the effect of a stay-green mutation on photosynthetic efficiency in hybrid offspring of soybean (Glycine max [L.] Merr.), the parameters of photosynthesis and chlorophyll (Chl) fluorescence were compared between a new stay-green variety Jinda Zhilv No. 1 (Z1) and one of its parents Jinda No. 74 (JD74). During leaf natural senescence, the Chl degradation attenuated in Z1. The net photosynthetic rate, stomatal conductance, and transpiration rate were consistently higher in Z1 than that in JD74 after flowering. The decreases of maximum photochemical efficiency of PSII, actual photochemical efficiency of PSII, and photochemical quenching...
Transcriptome sequence and physiological analysis revealed the roles of carotenoids and photosynthesis under low temperature combined with low-light stress on pepper (Capsicum annuum L.)
J. LI, J.M. XIE, J.H. YU, J. LYV, E.P. BAKPA, X.D. ZHANG, J. ZHANG, C.N. TANG, D.X DING, N.H. LI, F. GAO, C. WANG
Photosynthetica 2021, 59(1):24-36 | DOI: 10.32615/ps.2020.083
Low temperature combined with low light (LL) is an adverse factor seriously affecting pepper productivity and quality. However, little is known about the molecular mechanisms related to LL stress responses. Therefore, transcriptome and physiological changes in Hangjiao No. 2 (H2) and Xiangtela No. 2 (X2) pepper were studied under normal conditions and LL. We found 8,392 and 8,028 differentially expressed genes in H2 and X2, respectively, significantly associated with photosynthesis, photosynthesis antenna proteins, and carotenoids, were enriched in 27 and 40 gene ontology terms in H2 and X2, respectively, and 14 and 16 Kyoto Encyclopedia of Gene and...
In memory of George Papageorgiou, the father of biophysics of photosynthesis in Greece
M. TSIMILLI-MICHAEL
Photosynthetica 2021, 59(1):23 | DOI: 10.32615/ps.2021.001
Dr. George Papageorgiou, former Research Director of the Laboratory of Membrane Biophysics and Biotechnology at the National Centre for Scientific Research ‘Demokritos’, Athens, Greece, passed away on November 21, 2020.
Light quality-dependent regulation of photoprotection and antioxidant properties in rice seedlings grown under different light-emitting diodes
L.H. TRAN, D.G. LEE, S. JUNG
Photosynthetica 2021, 59(1):12-22 | DOI: 10.32615/ps.2020.082
We examined light quality-dependent regulation of photoprotection and antioxidant properties in rice seedlings. Seedlings grown under red or green light-emitting diodes (LEDs) showed declines in quantum yield of electron transport through PSII, maximum relative electron transport rates, and photochemical quenching compared to the white and blue LED, but no difference in maximum photochemical efficiency of PSII was found. Blue LED treatment resulted in greater increases in not only nonphotochemical quenching, but also zeaxanthin formation, expressions of β-carotene hydroxylase and violaxanthin de-epoxidase, and anthocyanin compared...
The quantitative proteomic analysis provides insight into the effects of drought stress in maize
H.-J. LI, Y.-F. WANG, C.-F. ZHAO, M. YANG, G.-X. WANG, R.-H. ZHANG
Photosynthetica 2021, 59(1):1-11 | DOI: 10.32615/ps.2020.078
Drought stress is one of the major environmental factors that limit maize yield in agriculture. However, few studies have analyzed how proteins respond to different degrees of drought at the proteome level. In this study, physiological characteristics and comparative tandem mass tag proteomics were used to analyze the responses of maize seedlings to mild and severe drought stresses in pot experiments. A total of 104 and 464 proteins were differentially expressed under mild and severe drought, respectively, but only 30 proteins were overlapped. Further Gene Ontology enrichment analysis showed maize can adapt to mild drought by activating antioxidant...
Effect of drought and heat stresses on photosynthesis, pigments, and xanthophyll cycle in alfalfa (Medicago sativa L.)
C. XU, C.G. HE, Y.J. WANG, Y.F. BI, H. JIANG
Photosynthetica 2020, 58(5):1226-1236 | DOI: 10.32615/ps.2020.073
Climate changes severely influence photosynthetic activity of plants. Studies on the combined effect of drought and heat stress on photosynthesis, pigments, and xanthophyll cycle particularly in alfalfa (Medicago sativa L.) are limited. Thus, this study investigated the combined effects of drought and heat stress in two alfalfa varieties ('Deqin' and 'Algonguin'). Results revealed that the values of the net photosynthetic rate demonstrated a significantly decreasing tendency under stresses. The effect of stresses on ribulose 1,5-bisphosphate carboxylase activity in both varieties showed a trend of first declining and then rising. Meanwhile,...
Photosynthetic machinery and antioxidant status of wheat genotypes under drought stress followed by rewatering
D.R. ALIYEVA, L.M. AYDINLI, A.N. PASHAYEVA, I.S. ZULFUGAROV, I.M. HUSEYNOVA
Photosynthetica 2020, 58(5):1217-1225 | DOI: 10.32615/ps.2020.074
Land plants shorten their vegetation period during water deficiency. Under water stress, wheat plants undergo several changes at the morphophysiological level. We tried to elucidate the role of the morphophysiological parameters and the photosynthetic machinery in response to drought followed by rewatering. Therefore, some morphophysiological traits of two bread wheat genotypes (drought-tolerant Gobustan, drought-sensitive Tale 38) were studied. The H2O2 content increased under drought in both genotypes but recovered in the Gobustan genotype after rewatering. The isozymes of peroxidase manifested dynamic changes under drought....
Phenolic acids inhibit the photosynthetic productivity of poplar
K. LI, T. ZHANG, H. LI, L.D. ZHANG, F. LI
Photosynthetica 2020, 58(5):1210-1216 | DOI: 10.32615/ps.2020.071
Barriers to continuous cropping of poplar plantations are closely related to the accumulation of phenolic acids in the soil. The purpose of this study was to explore the mechanism through which phenolic acid stress affects poplar productivity. The results showed that phenolic acids had a significant inhibitory effect on the photosynthesis of poplar. The inhibition of photosynthesis due to phenolic acids occurred mainly because, during electron transfer at the PSII reaction center, the primary quinone acceptor of PSII (QA) in the oxidized state was reduced, and excess light energy was lost in the form of heat dissipation; thus, poplar productivity...
Effect of simultaneous shade and drought stress on morphology, leaf gas exchange, and yield parameters of different soybean cultivars
I. SHAFIQ, S. HUSSAIN, B. HASSAN, M. SHOAIB, M. MUMTAZ, B. WANG, A. RAZA, A. MANAF, M. ANSAR, W. YANG, F. YANG
Photosynthetica 2020, 58(5):1200-1209 | DOI: 10.32615/ps.2020.067
An interactive effect of simultaneous shade and drought stress on drought-tolerant and drought-sensitive cultivars of soybean was studied. As drought stress intensified, the net photosynthetic rate decreased in both cultivars due to reduced leaf area, relative water content, transpiration rate, stomatal conductance, chlorophyll content, and Rubisco activity which ultimately led to yield reduction. Moreover, the chlorophyll fluorescence parameters also decreased. Interestingly, a moderate shade was found helpful in alleviating the adverse effects of drought stress, specifically in resistant cultivar N12 where seed yield improved significantly under...
Silencing of the receptor-like cytoplasmic kinase gene TaRKL1 reduces photosynthetic capacity in wheat
Y. YING, F.F. LIU, G.P. LI, Q. ZHENG, B. LI, Z.S. LI, J.F. CHENG, H.W. LI
Photosynthetica 2020, 58(5):1188-1199 | DOI: 10.32615/ps.2020.069
To explore the role of receptor-like kinases in the regulation of photosynthesis, an uncharacterized TaRKL1 encoding a receptor-like cytoplasmic kinase was investigated in Triticum aestivum cv. Xiaoyan 101 with Barley stripe mosaic virus-induced gene silencing system (BSMV-VIGS). The results showed that the CO2 assimilation rate, stomatal conductance, and transpiration rate were significantly lower in the BSMV:TaRKL1 plants than those in the BSMV:γ00 plants (control). Moreover, the maximum photochemical efficiency and electron transport flux decreased while the dissipated energy flux was enhanced...
Disturbance mechanism of coal mining subsidence to typical plants in a semiarid area using O-J-I-P chlorophyll a fluorescence analysis
Y. LIU, S.G. LEI, X.Y. CHEN, M. CHEN, X.Y. ZHANG, L.L. LONG
Photosynthetica 2020, 58(5):1178-1187 | DOI: 10.32615/ps.2020.072
The response of individual plants to coal mining subsidence disturbance reflects the micro-ecological mechanism implied in the macro-response, which is the basis of studying the rule of vegetation disturbance of large-scale coal mining. In this study, O-J-I-P chlorophyll a fluorescence analysis was used to diagnose the disturbance mechanism of typical individual plants by coal mining subsidence in a semiarid area. The results showed that the groundwater level and soil water content decreased due to the disturbance of coal mining subsidence and the plant growth was affected by drought stress. The rapid chlorophyll fluorescence induction curve...
Differences in leaf anatomy, photosynthesis, and photoprotective strategies in the yellow-green leaf mutant and wild type of Rosa beggeriana Schrenk
S.H. YANG, J.J. WEI, F. YAN, R.D. JIA, X. ZHAO, Y. GAN, H. GE
Photosynthetica 2020, 58(5):1167-1177 | DOI: 10.32615/ps.2020.059
Although the underlying mechanisms of chlorophyll biosynthesis have been intensively deciphered in model plants, leaf color mutants have not yet been fully studied in woody species. In this study, leaf anatomy, diurnal changes in photosynthesis and photoprotection were investigated in the yellow-green leaf (ygl) mutant of Rosa beggeriana. Chloroplast ultrastructure, pigment biosynthesis, and photosynthesis were impaired and led to photoinhibition at noon in the ygl mutant. The negative changes in leaf anatomy increased the risk of excess light absorption in the mutant. Moreover, the ygl mutant preferred to consume the excited...
Relationship of fertilizer and periodic drought on biomass allocation in greenhouse-grown sunflower
Z.Y. LI, B.L. DUNN, C. FONTANIER
Photosynthetica 2020, 58(5):1160-1166 | DOI: 10.32615/ps.2020.061
The objective was to analyze organ plasticity in biomass allocation in response to limited resources and its influence on commercial traits of potted sunflower production. Although drought dramatically increased net photosynthetic rate and water-use efficiency, total leaf area, leaf dry mass, and total dry mass with drought stress decreased at rates of 20.9, 21.8, 23.0, and 9.9%, respectively. Irrigation positively affected specific leaf area, stem mass fraction, and root mass fraction. Adversely, fertilizer had a negative effect on stem mass fraction, root mass fraction, and root/shoot ratio. Interestingly, leaf mass fraction was not affected by them....