Photosynthetica - Ahead of Print
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 X:X | 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 X:X | 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...
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 X:X | 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...
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 X:X | 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...
Recovery of photosynthetic activity of resurrection plant Haberlea rhodopensis from drought- and freezing-induced desiccation
K. GEORGIEVA, G. MIHAILOVA, M. VELITCHKOVA, A. POPOVA
Photosynthetica X:X | 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...
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 X:X | 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...
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 X:X | 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,...
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 X:X | 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...