Diurnal response of effective quantum yield of PSII photochemistry to irradiance as an indicator of photosynthetic acclimation to stressed environments revealed in a xerophytic species

2017 ◽  
Vol 74 ◽  
pp. 191-197 ◽  
Author(s):  
Tian-Shan Zha ◽  
Ya Juan Wu ◽  
Xin Jia ◽  
Ming Yan Zhang ◽  
Yu Jie Bai ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Photosynthetic Acclimation ◽  
Effective Quantum Yield ◽  
Psii Photochemistry ◽  
Quantum Yield Of Psii

scholarly journals Allelopathic effect of the Baltic picocyanobacterium Synechococcus sp. on selected diatoms

2017 ◽  
Author(s):  
Zofia Konarzewska ◽  
Sylwia Śliwińska-Wilczewska ◽  
Adam Latała
Keyword(s):  
Quantum Yield ◽  
Algal Blooms ◽  
Allelopathic Effect ◽  
Effective Quantum Yield ◽  
Fluorescence Parameters ◽  
Psii Photochemistry ◽  
Synechococcus Sp ◽  
The Baltic ◽  
Allelopathic Interactions ◽  
Quantum Yield Of Psii

It is commonly believed that the structure of phytoplankton and the formation of cyanobacterial and algal blooms may be explained by allelopathic interactions. The main aim of this study was to investigate the allelopathic effect of picocyanobacterium Synechococcus sp. on the following growth and fluorescence parameters: the maximum quantum yield of PSII photochemistry (Fv/Fm), and the effective quantum yield of PSII photochemistry (ΦPSII) of selected diatoms – Nitzschia fonticola, Fistulifera saprophila, Navicula perminuta and Amphora coffeaeformis. In this study, it was demonstrated that picocyanobacterium caused allelopathic effects against Baltic diatoms. The results showed that the addition of cell-free filtrate from Synechococcus sp. increased the number of cells of N. fonticola and F. saprophila. Moreover, it was found that picocyanobacterium was stimulated fluorescence parameters of N. fonticola, F. saprophila, and N. perminuta. On the other hand, it was noted that filtrate obtained from picocyanobacterium caused the inhibition of Fv/Fm parameter of A. coffeaeformis. The results of this experiment may provide further information about allelopathic interactions between Baltic picocyanobacteria and diatoms that are crucial to the understanding of algal blooms in aquatic ecosystems.

scholarly journals Seasonal Variation in Diurnal Photosynthesis and Chlorophyll Fluorescence of Four Genotypes of Cassava (Manihot esculenta Crantz) under Irrigation Conditions in a Tropical Savanna Climate

Agronomy ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 206 ◽  
Author(s):  
Supranee Santanoo ◽  
Kochaphan Vongcharoen ◽  
Poramate Banterng ◽  
Nimitr Vorasoot ◽  
Sanun Jogloy ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Quantum Yield ◽  
Rainy Season ◽  
Genotypic Variation ◽  
Effective Quantum Yield ◽  
Tropical Savanna ◽  
Psii Photochemistry ◽  
Diurnal Photosynthesis ◽  
Hot Season ◽  
Quantum Yield Of Psii

Photosynthesis performance during early vegetative growth is an important physiological trait determining yield of cassava, but limited information is currently available for the tropical savanna climate of Asia. Diurnal photosynthesis and chlorophyll fluorescence of the three-month-old plants of four commercial cassava genotypes (Rayong 9, RY9; Rayong 11, RY11; Kasetsart 50, KU50 and CMR38-125-77) grown under irrigation, were investigated in three seasons i.e., rainy, cool and hot. The mean daily net photosynthetic rate (Pn) across genotypes in the rainy season (11.75 µmolCO2/m2/s) was significantly lower than that in the cool season (14.60 µmolCO2/m2/s). Daily mean Pn in the hot season was 14.32 µmolCO2/m2/s. In the rainy season, maximum photochemical quantum yield of PSII (Fv/Fm) and effective quantum yield of PSII photochemistry (ΦPSII) were significantly higher than the other seasons, while electron transfer rate (ETR) and non-photochemical quenching (NPQ) were significantly lower. Genotypic variation was observed during the hot season in which RY11 had the highest and CMR38-125-77 the lowest mean daily Pn. The prominent mechanism to avoid damages from stress during afternoon in the hot season was to reduce leaf temperature by enhancing transpiration for RY11; to close stomata early for RY9, and to increase NPQ for CMR38-125-77.

scholarly journals Physiological, morphological and anatomical leaf traits variation across leaf development in 'Corylus avellana'

2019 ◽  
Vol 40 (2) ◽  
pp. 185-192 ◽  
Author(s):  
Rosangela Catoni ◽  
Francesco Bracco ◽  
Loretta Gratani ◽  
Mirko Umberto Granata
Keyword(s):  
Quantum Yield ◽  
Leaf Development ◽  
Leaf Traits ◽  
Corylus Avellana ◽  
Leaf Mass Per Area ◽  
Second Phase ◽  
Effective Quantum Yield ◽  
Maximum Quantum Yield ◽  
Psii Photochemistry ◽  
Quantum Yield Of Psii

The study analyzed the variations of physiological, morphological and anatomical leaf traits during its development in Corylus avellana L. saplings. Three different phases were identify during leaf development: the first phase (hereafter IP) considered in the developing leaves, the second phase (IIP) in the mature green leaves and the third phase (IIIP) in the senescent leaves. In particular, variations in parameters estimated from the photosynthetic light response curves, in chlorophyll fluorescence variables and in morphological leaf traits were analyzed during the three phases. The principal component analysis (PCA) carried out using all the considered morphological characters (leaf mass per area - LMA, and leaf tissue density - LTD) and physiological traits (the maximum net photosynthetic rates - ANmax, dark respiration rates - RD, light compensation point - LCP, light saturation point – LSP, maximum quantum yield - ɸmax, fluorescence-based maximum quantum yield of PSII photochemistry - Fv/FM and effective quantum yield of PSII photochemistry - ɸPSII) showed a complete separation among the considered phases. The results showed that the major differences occur between the phases IP and IIP. In particular, a greater variation was found for LMA, ANmax, RD. On the contrary a lower variation was observed for ɸmax which remain quite constant from IP to IIP indicating that chloroplasts present in juvenile leaves are fully functional.

scholarly journals Ionic Homeostasis and Redox Metabolism Upregulated by 24-Epibrassinolide are Crucial for Mitigating Nickel Excess in Soybean Plants, Enhancing Photosystem II Efficiency and Biomass

2021 ◽  
Author(s):  
Marcelo Pires Saraiva ◽  
Camille Ferreira Maia ◽  
Bruno Lemos Batista ◽  
Allan Klynger da Silva Lobato
Keyword(s):  
Photosystem Ii ◽  
Membrane Damage ◽  
Effective Quantum Yield ◽  
Ionic Homeostasis ◽  
Nutrient Contents ◽  
Photosystem Ii Efficiency ◽  
Psii Photochemistry ◽  
Soybean Plants ◽  
Negative Impacts ◽  
Quantum Yield Of Psii

Abstract Nickel (Ni) excess often generates oxidative stress in chloroplasts, causing redox imbalance, membrane damage and negative impacts on biomass. 24-Epibrassinolide (EBR) is a plant growth regulator of great interest in the scientific community because it is a natural molecule extracted from plants that is biodegradable and environmentally friendly. This study aimed to determine whether EBR can induce benefits on ionic homeostasis and antioxidant enzymes and convey possible repercussions on photosystem II efficiency and biomass, more specifically evaluating nutritional, physiological, biochemical and morphological responses in soybean plants subjected to Ni excess. The experiment was randomized with four treatments, including two Ni concentrations (0 and 200 µM Ni, described as – Ni2+ and + Ni2+, respectively) and two concentrations of 24-epibrassinolide (0 and 100 nM EBR, described as – EBR and + EBR, respectively). In general, Ni caused deleterious modulatory effects on chlorophyll fluorescence and gas exchange. In contrast, EBR enhanced the effective quantum yield of PSII photochemistry (15%) and electron transport rate (19%) due to upregulation of superoxide dismutase, catalase, ascorbate peroxidase and peroxidase. Exogenous EBR application promoted significant increases in biomass, and these results were explained by the benefits on nutrient contents and ionic homeostasis, demonstrated by increased Ca2+/Ni2+, Mg2+/Ni+ 2 and Mn2+/Ni2+ ratios.

scholarly journals Rice Photosynthetic Productivity and PSII Photochemistry under Nonflooded Irrigation

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Haibing He ◽  
Ru Yang ◽  
Biao Jia ◽  
Lin Chen ◽  
Hua Fan ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Nitrogen Content ◽  
Photosynthetic Characteristics ◽  
Furrow Irrigation ◽  
Effective Quantum Yield ◽  
Photosynthetic Productivity ◽  
Supplementary Irrigation ◽  
Psii Photochemistry ◽  
Plastic Mulching ◽  
Irrigation Treatments

Nonflooded irrigation is an important water-saving rice cultivation technology, but little is known on its photosynthetic mechanism. The aims of this work were to investigate photosynthetic characteristics of rice during grain filling stage under three nonflooded irrigation treatments: furrow irrigation with plastic mulching (FIM), furrow irrigation with nonmulching (FIN), and drip irrigation with plastic mulching (DI). Compared with the conventional flooding (CF) treatment, those grown in the nonflooded irrigation treatments showed lower net photosynthetic rate(PN), lower maximum quantum yield(Fv/Fm), and lower effective quantum yield of PSII photochemistry (ΦPSII). And the poor photosynthetic characteristics in the nonflooded irrigation treatments were mainly attributed to the low total nitrogen content (TNC). Under non-flooded irrigation, thePN,Fv/Fm, andΦPSIIsignificantly decreased with a reduction in the soil water potential, but these parameters were rapidly recovered in the DI and FIM treatments when supplementary irrigation was applied. Moreover, The DI treatment always had higher photosynthetic productivity than the FIM and FIN treatments. Grain yield, matter translocation, and dry matter post-anthesis (DMPA) were the highest in the CF treatment, followed by the DI, FIM, and FIN treatments in turn. In conclusion, increasing nitrogen content in leaf of rice plants could be a key factor to improve photosynthetic capacity in nonflooded irrigation.

Photoinhibition of Photosynthesis in situ in Six Species of Eucalyptus

1992 ◽  
Vol 19 (3) ◽  
pp. 223 ◽  
Author(s):  
E Ogren ◽  
JR Evans
Keyword(s):  
Quantum Yield ◽  
Time Course ◽  
O2 Evolution ◽  
Photoinhibition Of Photosynthesis ◽  
Low Light ◽  
First Order ◽  
Psii Photochemistry ◽  
Kinetics Of ◽  
Quantum Yield Of Psii

Photoinhibition of photosynthesis was investigated in horizontally and vertically restrained leaves of Eucalyptus plants growing outdoors. This was done by measuring the quantum yield of PSII photochemistry, assayed by the ratio of variable to maximal fluorescence (FV/FM) after 15 min of dark adaptation, and the quantum yield of O2 evolution. On clear days, a time-dependent depression in both parameters was observed. Though horizontal leaves showed stronger photoinhibition (max. 40%) than did vertical leaves (max. 30%), this difference was smaller than the threefold difference in light interception. Since the inherent susceptibility to photoinhibition was the same in vertical and horizontal leaves, a non-linear light dependence of photoinhibition was assumed. The time course of recovery from photoinhibition under low light followed the kinetics of a first order reaction, with 50% recovery after 45 min. When watering was restricted on a hot and clear day a more severe photoinhibition developed in horizontal leaves, which took several days of low light to overcome. This photoinhibition state was triggered by high leaf temperatures, resulting from decreased stomatal conductance and transpiration, which sensitised the leaf to light.

scholarly journals Comparative stomatal conductance and chlorophyll a fluorescence in leaves vs. fruits of the cerrado legume tree, Dalbergia miscolobium

2004 ◽  
Vol 16 (2) ◽  
pp. 89-93 ◽  
Author(s):  
José Pires de Lemos Filho ◽  
Rosy Mary dos Santos Isaias
Keyword(s):  
Water Vapor ◽  
Stomatal Conductance ◽  
Quantum Yield ◽  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Electron Transport Rate ◽  
Early Morning ◽  
Effective Quantum Yield ◽  
Quantum Yield Of Psii ◽  
Chronic Photoinhibition

The aim of this study was to compare water vapor conductance and chlorophyll a fluorescence between leaflets and fruits of Dalbergia miscolobium, the Jacaranda tree. The frequency of stomata on the leaflets was 20 times higher than that observed on the fruits, and this was related with the lower conductance of the fruits in comparison with the leaflets. The potential quantum yield of PSII (Fv /Fmax) was significantly lower in fruits than in leaflets. The Fv /Fmax values for leaflets increased to over 0.8 during the afternoon, indicating the occurrence of dynamic photoinhibition. In contrast, Fv /Fmax values for fruits remained low even at early morning, indicating the occurrence of chronic photoinhibition. The maximum values of effective quantum yield (deltaF/F'm), and of the apparent electron transport rate (ETRmax) were higher in leaflets than in fruits. It was concluded that, like other green tissues, the pericarp of D. miscolobium was photosynthetically active, and therefore can contribute to the maintenance of the fruits and/or to the development of the seeds.

scholarly journals Growth and photosynthesis of Lemna minor L. exposed to different light conditions and sucrose supplies

2013 ◽  
Vol 72 (2) ◽  
pp. 211-219 ◽  
Author(s):  
Željka Vidaković-Cifrek ◽  
Sonja Sorić ◽  
Marija Babić
Keyword(s):  
Quantum Yield ◽  
Lemna Minor ◽  
Action Spectrum ◽  
Photosynthetic Performance ◽  
Light Sources ◽  
Effective Quantum Yield ◽  
Light Conditions ◽  
Promotive Effect ◽  
Sucrose Supply ◽  
Quantum Yield Of Psii

Abstract Duckweed (Lemna minor L.) is a model plant suitable for investigation into plant physiology, biochemistry and ecotoxicology. Depending on the type of the experiment, duckweed is cultivated on different nutrient media under various chamber conditions. In our work, duckweed was cultivated on Pirson-Seidel’s nutrient solution supplemented with 5, 7.5 or 10 g L-1 sucrose under cool white (CW) or Gro-Lux (GL) light sources. When different light sources and sucrose supplies are compared, a significant stimulative effect of GL light on duckweed grown on 7.5 and 10 g L-1 sucrose was seen to start on day 9. Considering photosynthetic performance the results showed that there were no significant differences in maximum quantum yield of PSII (Fv/Fm) after 7 and 16 days of exposure, regardless of light source and sucrose supply. Effective quantum yield of PSII (ΦPSII) decreased only after 16 days of exposure to 5 g L-1 sucrose under CW light. The higher growth rate and photosynthetic performance in plants exposed to GL light is a consequence of its spectral distribution resembling the action spectrum of photosynthesis. Furthermore, enhanced growth noticed in plants cultivated on higher sucrose contents (7.5 and 10 g L-1) indicated the promotive effect of sucrose in plants grown under low light conditions.

scholarly journals Temperature-dependent chlorophyll accumulation and photosystem II assembly during etioplast to chloroplast transition in sunflower cotyledons

2017 ◽  
Vol 76 (1) ◽  
pp. 107-110
Author(s):  
Hrvoje Lepeduš ◽  
Mario Jakopec ◽  
Jasenka Antunović Dunić ◽  
Goran Krizmanić ◽  
Sanida Osmanović ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Photosystem Ii ◽  
Heat Dissipation ◽  
Higher Plants ◽  
Photochemical Quenching ◽  
Effective Quantum Yield ◽  
Chlorophyll Accumulation ◽  
Different Temperatures ◽  
The Impact ◽  
Quantum Yield Of Psii

Abstract Despite numerous data dealing with the biogenesis of photosynthetic membranes connected with specific functional alterations in higher plants this is still an insufficiently understood topic and is one of the most promising areas of research in plant biochemistry. The main goal of our study was to detect the impact of different temperatures on chlorophyll biosynthesis and the maximum quantum yield of PSII (Fv/Fm). Therefore, we investigated the greening processes in etiolated sunflower cotyledons (Helianthus annuus L.) grown at different temperatures (10, 20 and 30 °C) during 24 h. The dynamics of chlorophyll a and b (Chl a and Chl b) accumulation as well as photosystem II (PSII) effi ciency were observed. We also evaluated combined effects of different temperatures (20 and 30 °C) and short-term application of increased irradiation (800 μmol m-2 s-1) on effective quantum yield of PSII (ΔF/F’m) and non photochemical quenching (NPQ) in cotyledons with fully developed PSII. Our results showed reduced chlorophyll accumulation and the arrest of PSII assembly at 10 °C in comparison with 20 and 30 °C. Further, the increased irradiance induced equal down regulation of effective quantum yield of PSII at 20 and 30 °C, with significantly higher capability of heat dissipation at 30 °C.

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