Photosynthetica - Latest articles
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Evaluation of morpho-physiological traits under drought stress conditions in barley (Hordeum vulgare L.)
T. ISTANBULI, M. BAUM, H. TOUCHAN, A. HAMWIEH
Photosynthetica 2020, 58(4):1059-1067 | DOI: 10.32615/ps.2020.041
Drought stress is one of the major constraints limiting the production and productivity of barley. We tried to identify some indicators related to plant productivity by analyzing some agro-morphological and physiological traits in recombinant inbred lines (RILs). Plants were exposed to three water treatments: well-watered at 70% available water content (AWC), mild drought stress at 35% AWC, and severe drought stress at 10% AWC. Our results revealed that drought significantly affected most of the studied morpho-physiological traits resulting in strong decreases in yield and the studied traits. We did not observe a significant difference in water-use...
Spectroscopic study of the light-induced changes of the core antenna complex CP43 in photosystem II
Y.G. QU, F. ZHOU, T.Y. KUANG
Photosynthetica 2020, 58(4):1053-1058 | DOI: 10.32615/ps.2020.062
In this study, spectroscopic approaches were used to evaluate light-induced changes in chlorophyll protein 43 (CP43). Upon illumination, we observed chlorophyll (Chl) a bleaching with the complete opening of the tetrapyrrole ring. Electronic transition frequencies to different energy levels of the second singlet electronic state (S2) were changed. In addition, we observed altered rotational and vibrational transitions of Chl a and the CP43 apoprotein as well as variations in the microenvironment surrounding Chl a. CP43 contains three β-carotene (β-Car) and five Chl a molecules, which are involved in...
Drought tolerance of faba bean (Vicia faba L.) can be improved by specific LED light wavelengths
L. HUANG, Y. XIAO, J. RAN, L. WEI, Z. LI, Y. LI, X. ZHANG, L. LIAO, D. WANG, X. ZHAO, Q. XIAO, Y. GUO
Photosynthetica 2020, 58(4):1040-1052 | DOI: 10.32615/ps.2020.052
A light wavelength affects both plant photomorphogenesis and stress resistance. In this study, the phenotypic plasticity (growth parameters and cuticular waxes) and physiological adaptation (photosynthetic properties and antioxidant enzyme activities) of faba bean subjected to specific LED lights, red, yellow, blue, violet, and white, were analyzed under two water conditions (normal and drought). The plants grown under red and yellow lights possessed the smaller leaf size and the higher leaf relative water content. The blue light had a positive effect on improving stomatal conductance and net photosynthetic rate of faba bean leaves, and the plants...
Photosynthesis and nutrient-use efficiency in response to N and P addition in three dominant grassland species on the semiarid Loess Plateau
Z.F. CHEN, P.F. XIONG, J.J. ZHOU, S.B. LAI, C.X. JIAN, Z. WANG, B.C. XU
Photosynthetica 2020, 58(4):1028-1039 | DOI: 10.32615/ps.2020.056
Understanding the ecophysiological and nutrient-use strategies of dominant species is important for clarifying plant growth and an ecological process in their community under unbalanced N and P inputs. This study investigated effects of N and P addition [main plot: 0, 25, 50, and 100 kg(N) ha-1 year-1; subplot: 0, 20, 40, and 80 kg(P) ha-1 year-1] on leaf N and P contents (LNCa and LPCa), photosynthetic capacity (PNmax) and photosynthetic N- and P-use efficiencies (PNUE and PPUE) in three species (Stipa bungeana, Bothriochloa ischaemum, and Lespedeza...
Effects of hybridization on the determinants of photosynthetic capacity in Buddleja F1 hybrids
W.C. GONG, Y.Q. CHEN, J. WANG, H. YUAN
Photosynthetica 2020, 58(4):1019-1027 | DOI: 10.32615/ps.2020.054
Photosynthetic capacity plays an important role in plant vegetative growth, and is often regarded as a key determinant of adaptability in plant species, including the hybrids. Interspecific hybridizations are common and can easily occur in Buddleja. The F1 hybrid investigated in this study is a newly discovered interspecific hybrid between B. crispa and B. officinalis, and it was found in the Sino-Himalayan region. In this study, the morphological traits, the stoichiometric characteristics and the gas-exchange traits in F1 hybrids and their parents were measured under the cultivation conditions. Buddleja F1 hybrids showed...
Sugarcane leaf photosynthetic light responses and their difference between varieties under high temperature stress
Y.Y. LIU, J. LI, S.C. LIU, Q. YU, X.J. TONG, T.T. ZHU, X.X. GAO, L.X. YU
Photosynthetica 2020, 58(4):1009-1018 | DOI: 10.32615/ps.2020.038
Leaf photosynthetic light response (PLR) of six sugarcane (Saccharum officinarum L.) varieties with a high sugar content was measured in the field. PLR curves were fitted by the rectangular hyperbola (RH) model, the nonrectangular hyperbola (NRH) model, and the Ye model, respectively. Photoinhibition occurred under warm and humid environment for all tested sugarcane varieties except for GT02-467 with the photosynthetic rate reduced significantly. The Ye model was the best for PLR curve fitting, especially when photoinhibition occurred. Nearly all PLR parameters estimated by the Ye model were better than the other two models. Some PLR parameters...
Implications of intra-seasonal climate variations on chlorophyll a fluorescence and biomass in winter barley breeding program
L. BEGOVIĆ, V. GALIĆ, I. ABIČIĆ, Z. LONČARIĆ, A. LALIĆ, S. MLINARIĆ
Photosynthetica 2020, 58(4):995-1008 | DOI: 10.32615/ps.2020.053
This study aimed to explore how ten selected winter barley genotypes responded to variations in environmental conditions during the growth season by using fast chlorophyll a fluorescence and normalized difference vegetation index (NDVI) at the booting, anthesis and early grain-filling stage. Lower amount of rainfall during the anthesis induced instability in the function of PSII, observed as the positive K-band in six and the positive L-band in seven genotypes. At grain filling, all genotypes displayed negative K- and L-bands, suggesting an increase of stability within PSII. The performance index increased from booting to grain filling in most...
Exogenous acetylcholine alleviates cadmium-induced phytotoxicity by modulating photosynthetic metabolism and antioxidant potential in tobacco (Nicotiana benthamiana)
Y.Y. SU, Y.Q. CHENG, C. QIN, N. AHMED, Y.H. MU, N.S. MUSTAFAD, M. ASHRAF, L.X. ZHANG
Photosynthetica 2020, 58(4):984-994 | DOI: 10.32615/ps.2020.051
Acetylcholine (ACh) plays a potential role in mediating various physiological processes in plants. However, the involvement of acetylcholine in cadmium (Cd) stress tolerance is unknown. Cd stress caused a decline in biomass, pigment, and photosynthetic capacity in Nicotiana benthamiana plants. A significant oxidative stress was evident through enhancing the accumulation of reactive oxygen species and lipid peroxidation. However, pretreatment with acetylcholine (50 and 100 µM) effectively decreased oxidative damage, especially by 50 µM ACh, which reduced H2O2 and O2*- contents by 50.4...
HISTORY
My contact and cooperation with Govindjee over the last five decades: Chlorophyll fluorescence and Rebeiz Foundation
H.K. LICHTENTHALER
Photosynthetica 2020, 58(4):976-983 | DOI: 10.32615/ps.2020.055
Govindjee and Hartmut Lichtenthaler have a very similar curriculum vitae. Both chose photosynthesis as research field and actively applied chlorophyll fluorescence. Their research was overlapping and complementary. On the occasion of Govindjee's 88th anniversary in 2020, Hartmut Lichtenthaler gives a short retrospective on interactions and joint activities with Govindjee over the past five decades.
LETTER TO EDITOR
Light regulation of photosynthetic light harvesting doubles the biomass yield in the green alga Chlamydomonas
R.T. SAYRE, S. NEGI, G. GOVINDJEE
Photosynthetica 2020, 58(4):974-975 | DOI: 10.32615/ps.2020.049
Due to the overall low thermodynamic efficiency (1–4%) of photosynthesis (Ort et al. 2011, Subramanian et al. 2013) and its impact on crop productivity, substantial efforts are being made to engineer photosynthesis to improve its light use and carbon capture efficiency to increase crop yields.
Effect of exogenously applied 20-hydroxyecdysone on the efficiency of primary photosynthetic processes substantially differs across plant species
D. HOLÁ, K. FRIMLOVÁ, M. KOČOVÁ, H. MARKOVÁ, O. ROTHOVÁ, L. TŮMOVÁ
Photosynthetica 2020, 58(4):961-973 | DOI: 10.32615/ps.2020.050
The effects of 20-hydroxyecdysone on the primary photosynthetic processes (PPP) were examined across twelve plant species using the OJIP chlorophyll fluorescence analysis. Our experiments brought evidence that the ecdysteroids can function not only as protective compounds in plants but participate also in the regulation of photosynthesis. Exogenously applied 20-hydroxyecdysone positively affected the PPP particularly in French bean and canola. Contrary to this, the PPP were negatively influenced by 20-hydroxyecdysone in pea, sunflower, and wheat. The performace of the oxygen-evolving complex, the excitonic connectivity among PSII units, the electron...
Foliar nitrogen supply enhances the recovery of photosynthetic performance of cold-stressed coffee (Coffea arabica L.) seedlings
R. ACIDRI, Y. SAWAI, Y. SUGIMOTO, D. SASAGAWA, T. MASUNAGA, S. YAMAMOTO, E. NISHIHARA
Photosynthetica 2020, 58(4):951-960 | DOI: 10.32615/ps.2020.047
Cold-stressed leaves possess an elevated risk of photodamage due to an inefficient photosynthetic apparatus during winter conditions. Recovery of cold-stressed coffee seedlings treated with different concentrations of nitrogen applied as foliar urea sprays [control (0), 5, 10, 20, and 40 mM], was investigated under optimum growth chamber conditions (25/20°C) for three months. Concentrations of nitrogen and photosynthetic pigments in the leaves increased with increasing concentration of the foliar sprays up to 20 mM. This was accompanied with a recovery of the photosynthetic apparatus and increased net carbon assimilation rate. In addition, 10 and 20...
Growth, photosynthesis, and reactive oxygen system responses of allotriploid Populus cathayana to salt stress
T. QIU, Y. WANG, X.N. GENG, Y. ZHANG, Y. LI, X.Y. KANG
Photosynthetica 2020, 58(4):944-950 | DOI: 10.32615/ps.2020.043
Polyploid plants are generally considered to have a high stress resistance. In this study, two full sibling allotriploid populations (FDR and SDR) with different 2n female gamete sources and one diploid population (2N) obtained from the same Populus cathayana parents were investigated. We compared the growth morphology, photosynthetic parameters, peroxidase activity and proline contents after salt stress. The results showed that the salt tolerance of the triploid poplar population was higher than that of the diploid population. And there were some differences between the genotypes of the triploid and diploid populations under salt stress. The...
Effects of different light quality and biofertilizers on structural and physiological traits of spinach plants
L. VITALE, E. VITALE, G. GUERCIA, M. TURANO, C. ARENA
Photosynthetica 2020, 58(4):932-943 | DOI: 10.32615/ps.2020.039
In this work, the effects of light quality and beneficial microbes (biofertilizer) supply on structural and ecophysiological traits of spinach were investigated. Plants were grown under four light quality regimens: white light (WL), red-blue (RB), red-green (RG), and red (R) light, with or without the addition of biofertilizer. RG and R plants without biofertilizer showed morphological traits typical of shaded plants as wide leaf lamina and high photosynthetic pigment content. These plants also exhibited a higher photosynthetic capacity compared to WL and RB plants. The improved photosynthesis in RG plants was due to both morphological and physiological...
Red light optimized physiological traits and enhanced the growth of ramie (Boehmeria nivea L.)
M. REHMAN, S. FAHAD, M.H. SALEEM, M. HAFEEZ, M.H. UR RAHMAN, F. LIU, G. DENG
Photosynthetica 2020, 58(4):922-931 | DOI: 10.32615/ps.2020.040
Light is an important variable affecting the plant growth. In present study, the effects of different color light-emitting diodes (mixed colors, red, blue, and orange light) on plant growth, gas exchange, and oxidative stress were investigated in Boehmeria nivea L., by means of measuring growth, photosynthesis, chlorophyll (Chl) content, reactive oxygen species (ROS), and activity of antioxidant enzymes under controlled conditions. Comparing to the mixed colors light, red light significantly increased shoot and leaf biomass, plant height, number of leaves per plant, and stem diameter by increasing the Chl content and therefore promoting the...
Recovery of photosynthetic activity of resurrection plant Haberlea rhodopensis from drought- and freezing-induced desiccation
K. GEORGIEVA, G. MIHAILOVA, M. VELITCHKOVA, A. POPOVA
Photosynthetica 2020, 58(4):911-921 | DOI: 10.32615/ps.2020.044
The recovery of photosynthetic activity during rehydration of Haberlea rhodopensis from drought- and freezing-induced desiccation were investigated. The water uptake during the initial 15 h was slow thus preventing cellular damages. The results showed faster recovery of quantum efficiency of PSII in plants rehydrated after freezing stress (RAF) compared to plants rehydrated after drought stress (RAD) and the most significant differences between them were evident after 9-15 h of rehydration. Following rehydration, PSI activity recovered faster compared to PSII and in contrast to PSII, its activity was higher in RAD compared to RAF plants. During...
Comparative analysis of leaf photosynthetic characteristics and fruit sugar content in trees of Citrus cultivar 'Huangguogan' of different age
B. Xiong, X. Qiu, S.j. Huang, Y.T. YANG, G.c. Sun, X.j. Wang, X. Zhang, T.t. Dong, X.y. Shen, W. Wei, Z.h. Wang
Photosynthetica 2020, 58(4):902-910 | DOI: 10.32615/ps.2020.042
Citrus trees of cv. Huangguogan, 8-, 30-, and 280-year-old (8s, 30s, and 280s, respectively), were used to explore the photosynthesis and related enzyme activity. In spring shoot leaves, net photosynthetic rate (PN) of the 280s was significantly lower than that of the 30s and 8s, but it was opposite in summer shoot leaves. PN of the summer shoots was higher than that of the spring shoots. PN was significantly positively correlated with stomatal conductance, intercellular CO2 concentration, and transpiration rate, but was negatively correlated with maximum photochemical quantum yield of...
Role of anthocyanin and carotenoids in the adaptation of the photosynthetic apparatus of purple- and green-leaved cultivars of sweet basil (Ocimum basilicum) to high-intensity light
L.A. STETSENKO, P.P. PASHKOVSKY, R.A. VOLOSHIN, V.D. KRESLAVSKI, VL.V. KUZNETSOV, S.I. ALLAKHVERDIEV
Photosynthetica 2020, 58(4):890-901 | DOI: 10.32615/ps.2020.048
Comparative studies of the adaptation of green- and purple-leaved Ocimum basilicum varieties, which differ in carotenoid and anthocyanin contents, to high-intensity light have been carried out. The plants were grown for 21 d under white light-emitting diode providing different light intensities [300, 550, and 1,350 µmol(photon) m-2 s-1]. During the experiment, fresh mass and relative water content, photosynthetic pigment and anthocyanin content, amount of total free phenolic compounds, and the contents of thiobarbituric acid reactive substances and H2O2 were analysed. The fluorescent parameters,...
Effects of light intensity on the growth, photosynthetic characteristics, and secondary metabolites of Eleutherococcus senticosus Harms
M.Y. XU, K.X. WU, Y. LIU, J. LIU, Z.H. TANG
Photosynthetica 2020, 58(3):881-889 | DOI: 10.32615/ps.2020.045
In this investigation, we used the growth, photosynthetic physiological parameters, and targeted metabolite analysis to evaluate the responses of Eleutherococcus senticosus in different shading treatments. The results showed that the moderate shading treatment (Z1) promoted the growth and inhibited photosynthesis of plants. The severe shading treatment (Z2)inhibited both the growth and photosynthesis of the plants. Besides, Z1 had no significant effect on the PSII, while Z2 inhibited the PSII. Most of the eight medicinal metabolites accumulated in the Z1. The C6C1-...
Leaf gas exchange and growth of Capsicum annuum var. glabriusculum under conditions of flooding and water deficit
E. MARTÍNEZ-ACOSTA, L.C. LAGUNES-ESPINOZA, M. CASTELÁN-ESTRADA, F. LARA-VIVEROS, C. TREJO
Photosynthetica 2020, 58(3):873-880 | DOI: 10.32615/ps.2020.032
Growth and gas-exchange traits of Capsicum annuum var. glabriusculum under flooding and water deficit (WD) stress were measured in a greenhouse experiment. Flooding was applied to a group of plants for 0 (control), 5, and 10 d, and WD to another set at 100 (control field capacity), 70, 50, and 25% of the water applied to control. Flooding negatively affected stomatal conductance, photosynthetic and transpiration rate from 20 d after transplanting (DAT), with a significant decrease in biomass at 120 DAT. WD at 70, 50, and 25% severely affected the plant aerial and root biomass and the gas-exchange traits from 80 DAT, inhibiting both flowering...
Estimation of total nitrogen content in sugar beet leaves based on chlorophyll fluorescence parameters
C. FEI, H. FAN, X.X. FAN, G. XU
Photosynthetica 2020, 58(3):869-872 | DOI: 10.32615/ps.2020.036
Two sugar beet cultivars, Beta 356 and KWS9147, were grown in field trials at four different nitrogen contents (0, 75, 150, and 225 kg ha-1), and each fertilizer treatment was divided into four applications (100% prior to seeding; 70% prior to seeding and 30% at canopy development; 50% prior to seeding and 50% at canopy development; 30% prior to seeding and 70% at canopy development) in two consecutive growing seasons. Leaf chlorophyll fluorescence (ChlF) parameters and leaf nitrogen content were measured simultaneously at different growth stages, establishing an evaluation model of leaf nitrogen nutrition. The results showed that the correlation...
Changes in photosynthetic pigments and chlorophyll fluorescence parameters in the super-high-yielding rice hybrid Peiai64S/E32 during senescence
L.D. ZENG, Q.L. ZHANG, M.L. CAI, W.S. CHOW, C.L. PENG
Photosynthetica 2020, 58(3):862-868 | DOI: 10.32615/ps.2020.037
The hybrid rice (Oryza sativa L.) cultivar Peiai64S/E32, which is a hybrid of E32 and Peiai64S, has a super high yield compared with that of its parents. Changes in photosynthetic pigments and chlorophyll (Chl) fluorescence parameters were investigated in the flag leaves during senescence. The content of Chl and carotenoids in the flag leaves of Peiai64S/E32 was more stable than those of their parents during senescence. Furthermore, Peiai64S/E32 had a more stable PSII activity and a lower nonphotochemical quenching and deepoxidation state than that of its parents in the later stage of senescence. These results demonstrated that Peiai64S/E32...
Low pH in simulated acid rain promotes the toxicity of copper on the physiological performance in Sargassum horneri
Z.H. ZHONG, S. QIN, Y. WANG, C. MA, Z.Y. LIU
Photosynthetica 2020, 58(3):853-861 | DOI: 10.32615/ps.2020.035
In order to investigate the interactive effects of simulated acid rain and copper (Cu) on macroalgae, Sargassum horneri was cultured under pH of 8.2, 5.6, 4.5 and Cu concentrations of 0, 25, 100 μg L-1. Under the medium concentration of Cu, moderate pH mitigated the toxicity of Cu on S. horneri, while the low pH and high Cu concentration reduced the contents of chlorophyll (Chl) a and carotenoids. Furthermore, pH had no interaction with Cu on maximal Chl fluorescence or electron transport efficiency, while effective PSII quantum yield, maximum electron transport rate, and saturating irradiance were obviously affected by pH and...
Comparison of leaves and stems of Paederia scandens (Lour.) Merr. in tolerance to low temperature
M.L. CAI, Q.L. ZHANG, X.T. ZHENG, J.J. ZHAI, C.L. PENG
Photosynthetica 2020, 58(3):846-852 | DOI: 10.32615/ps.2020.034
Low temperature is an important environmental factor that affects plant growth and development. To determine the adaptability of different organs of Paederia scandens (Lour.) Merr. to low temperature, the chlorophyll (Chl) fluorescence parameters as well as the Chl, malondialdehyde (MDA), soluble sugar, and anthocyanin contents of leaves and stems were measured under low temperature. The results confirmed that the Chl fluorescence parameters and Chl content of the leaves and stems of P. scandens tended to decrease consistently, while the MDA content increased, and the change range of the stems was much lower than that of the leaves. The...
Leaf gas exchange, oxidative stress, and physiological attributes of rapeseed (Brassica napus L.) grown under different light-emitting diodes
M.H. SALEEM, M. REHMAN, S. FAHAD, S.A. TUNG, N. IQBAL, A. HASSAN, A. AYUB, M.A. WAHID, S. SHAUKAT, L. LIU, G. DENG
Photosynthetica 2020, 58(3):836-845 | DOI: 10.32615/ps.2020.010
Through its impact on morphogenesis, light is the key environmental factor that alters plant structural development; however, the understanding how light controls plant growth and developmental processes is still poor and needs further research. For this purpose, a Petri dish and pot experiment was conducted to investigate the effects of different LEDs, i.e., white light (WL), red light (RL), blue light (BL), and orange light (OL) on morphology, gas-exchange parameters, and antioxidant capacity of Brassica napus. Compared with WL, RL significantly promoted plant growth and biomass, contents of photosynthetic pigments, and gas-exchange...
Photochemical performance and source-sink relationships in galls induced by Pseudophacopteron longicaudatum (Hemiptera) on leaves of Aspidosperma tomentosum (Apocynaceae)
V. MARTINI, A.S.F.P. MOREIRA, V.C. KUSTER, D.C. OLIVEIRA
Photosynthetica 2020, 58(3):827-835 | DOI: 10.32615/ps.2020.033
The establishment of the galling insect generates a biotic stress that leads to tissue transformation. However, galls can maintain chlorophyll (Chl) and consequently photosynthesize. Herein, we evaluated the consequences of the biotic stress generated by the galling insect Pseudophacopteron longicaudatum on photosynthetic rate during the leaf galls development on Aspidosperma tomentosum. In addition, we quantified polysaccharides and water content in order to evaluate the capacity of gall tissues to drain photoassimilates. The non-galled leaves contained more Chl and carotenoids per gram of fresh mass. Galls had lower values of maximum...
Effect of chitin and chitosan hexamers on growth and photosynthetic characteristics of wheat seedlings
K.C. LI, X.Q. ZHANG, Y. YU, R.E. XING, S. LIU, P.C. LI
Photosynthetica 2020, 58(3):819-826 | DOI: 10.32615/ps.2020.021
In this study, two homogeneous chitin and chitosan hexamers and one partially acetylated chitosan hexamer were used to investigate the degree of acetylation (DA) effects of chitooligosaccharides on the growth and photosynthesis of wheat seedlings. Both chitin and chitosan hexamers showed a significant promoting effect on the growth and photosynthesis of wheat seedlings but the positive effect depended on their DA. The homogeneous chitosan hexamers [(GlcN)6] exhibited the optimal activity compared to other samples. Seven days after (GlcN)6 treatment, the growth parameters of wheat seedlings were all significantly enhanced including...
A mixture of trehalose derivatives mitigates the adverse effects of water deficits in maize: an analysis of photosynthetic efficiency
A.S. AMBRÓSIO, J.A.N. PORTUGAL, K.R.D. SOUZA, L.C. SILVA, D.F. DIAS, J.R. MANTOVANI, P.C. MAGALHÃES, T.B. SOUZA, T.C. SOUZA
Photosynthetica 2020, 58(3):808-818 | DOI: 10.32615/ps.2020.031
This study tested a tosylated and azide trehalose derivative mixture for its ability to mitigate water deficit-induced stress in maize via photosynthetic efficiency analyses. The experiment was conducted in greenhouse pots, using a maize hybrid that is sensitive to drought. The mixture of derivatives (28 mM) was applied with a hand sprayer. Plants containing five/six fully expanded leaves were subjected to water deficit stress for 12 d, followed by rehydration. The derivative mixture increased the photosynthetic rate, electron transport rate, and photochemical quenching, and mitigated damage to photosystem II. Moreover, it led to anatomical...
Can anthocyanin presence ameliorate the photosynthetic performance of Prunus saplings subjected to polyethylene glycol-simulated water stress?
E. LO PICCOLO, M. LANDI, T. GIORDANI, G. LORENZINI, F. MALORGIO, R. MASSAI, C. NALI, E. PELLEGRINI, G. RALLO, D. REMORINI, P. VERNIERI, L. GUIDI
Photosynthetica 2020, 58(3):799-807 | DOI: 10.32615/ps.2020.017
The aim was the evaluation of the biochemical and physiological responses of green- (GP) and red-leafed (RP) Prunus cerasifera mature leaves to 20 d of polyethylene glycol (PEG 6000)-induced water stress in order to elucidate a possible ameliorative role exerted by anthocyanins. At 10 d, the anthocyanin content remained unchanged in RP water-stressed leaves. Photosynthetic rate was lower in GP than that of RP (83.4 vs. 76.5%, respectively), paralleled by a higher degree of photoinhibition (Fv/Fm) in GP leaves. Leaves of GP accounted for higher content of soluble sugars at 10 d, when RP only showed a slight sucrose...
Photosynthetic CO2 response to soil water and its simulation using different models in leaves of two species
Q. WU, T. ZHANG, C.R. LI, H.B. XIE, G.C. ZHANG
Photosynthetica 2020, 58(3):790-798 | DOI: 10.32615/ps.2020.023
CO2 concentrations and soil moisture conditions are important factors in photosynthesis of trees. This study investigated the photosynthetic CO2 responses in the leaves of Prunus sibirica L. and Pinus tabulaeformis Carr. under eight soil water conditions in a semiarid loess hilly region. CO2-response curves and physiological parameters were fitted using a rectangular hyperbola model, nonrectangular hyperbola model, exponential equation, and modified rectangular hyperbola model. Results revealed the relative soil water content (RWCs) for P. sibirica required to maintain higher photosynthetic rate...