Changes in activities of both photosystems and the regulatory effect of cyclic electron flow in field-grown cotton ( Gossypium hirsutum L) under water deficit

Yi, Xiaoping; Zhang, Yali; Yao, Hairui; Han, Jimei; Chow, Wah Soon; Fan, Dayong; Zhang, Wangfeng

doi:10.1016/j.jplph.2017.10.011

Cited by 23 publications

(16 citation statements)

References 57 publications

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“…However, we found that the NPQ of both ECM and NM gradually decreased under water-deficiency conditions, suggesting that thermal dissipation was affected in masson pine seedlings, i.e., masson pine seedlings dissipated excess energy through other methods. This conclusion is supported by the findings of Yi et al [63], who found that zeaxanthin (Z) (which correlates with the development of NPQ) content significantly decreased under water deficiency. Takahashi et al [64] also reported that thermal dissipation was not the main way to protect plant PSII from stress conditions.…”

Section: Physiological Responsesupporting

confidence: 72%

Role of Suillus placidus in Improving the Drought Tolerance of Masson Pine (Pinus massoniana Lamb.) Seedlings

Wang

Zhao

et al. 2021

Forests

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Masson pine is an important afforestation species in southern China, where seasonal drought is common. The present study focused on the effects of Suillus placidus, an ectomycorrhizal fungus, inoculation on the growth and physiological and biochemical performance of masson pine seedlings under four different watering treatments (well-watered, mild drought, moderate drought, and severe drought) to evaluate the symbiotic relationship between S. placidus and masson pine seedlings. Ectomycorrhizal-inoculated (ECM) and non-inoculated (NM) seedlings were grown in pots and maintained for 60 days using the weighing method. Results showed that seedlings' growth, dry weight, RWC, chlorophyll content, PSII efficiency, and photosynthesis decreased as drought stress intensified in both ECM and NM plants. This suggests that drought stress significantly limits the growth and photosynthetic performance of masson pine seedlings. Nevertheless, increased An/gs and proline contents in both NM and ECM prevented oxidative damage caused by drought stress. In addition, increased peroxidase (POD) activity is an essential defense mechanism of ECM seedling under drought stress. Compared with NM, ECM seedlings showed faster growth, higher RWC, and photosynthetic performance, and lower lipid peroxidation in cell membranes under drought stress, as indicated by higher POD activity and lower proline and malondialdehyde (MDA). Our experiment found that S. placidus inoculation can enhance the drought resistance of masson pine seedlings by increasing antioxidant enzyme activity, water use efficiency, and proline content, thereby enhancing growth under water-deficiency conditions. S. placidus can be used to cultivate high-quality seedlings and improve their survival in regions that experience seasonal droughts.

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Section: Physiological Responsesupporting

confidence: 72%

Role of Suillus placidus in Improving the Drought Tolerance of Masson Pine (Pinus massoniana Lamb.) Seedlings

Wang

Zhao

et al. 2021

Forests

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“…The lower NPQ in Chinese fir and 2-year-old moso bamboo in MCM indicates that the light energy captured by leaves was fully used for photosynthesis (Liu et al, 2016), increasing photoprotection for the plants and reducing the risk of light damage (Zhang et al, 2017a;Demmig-Adams et al, 1996). However, the significantly higher NPQ of the 1-year-old moso bamboo in the MCM suggested that thermal energy dissipation was activated to dissipate the excess light energy, thereby preventing ROS generation and maintaining the balance between the absorption and consumption of light energy under a moderate water deficit (Yi et al, 2018). The above results suggested that MCM improved the light use efficiency of each component compared to that of PCF and PMB.…”

Section: Effects Of Mixed Growth On Fluorescence Parametersmentioning

confidence: 99%

Growing in Mixed Stands Increased Leaf Photosynthesis and Physiological Stress Resistance in Moso Bamboo and Mature Chinese Fir Plantations

Peng

YanDong²,

et al. 2021

Front. Plant Sci.

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Mixed-stand plantations are not always as beneficial for timber production and carbon sequestration as monoculture plantations. Systematic analyses of mixed-stand forests as potential ideal plantations must consider the physiological-ecological performance of these plantations. This study aimed to determine whether mixed moso bamboo (Phyllostachys pubescens (Pradelle) Mazel ex J. Houz.) and Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) stands exhibited better physiological-ecological performance than monoculture plantations of these species. We analyzed leaf photosynthesis, chlorophyll fluorescence, antioxidant enzyme activities, chlorophyll content and leaf chemistry in a moso bamboo stand, a Chinese fir stand and a mixed stand with both species. The results showed that both species in the mixed stand exhibited significantly higher leaf net photosynthesis rate (Amax), instantaneous carboxylation efficiency (CUE), chlorophyll content, maximum quantum yield of photosynthesis (Fv/Fm), photochemical quenching coefficient (qP), PSII quantum yield [Y(II)], leaf nitrogen content, and antioxidant enzyme activities than those in the monoculture plantations. However, the non-photochemical quenching (NPQ) in Chinese fir and 2-year-old moso bamboo was significantly lower in the mixed stand than in the monocultures. In addition, the water use efficiency (WUE) of Chinese fir was significantly higher in the mixed stand. The results suggest that the increase in leaf net photosynthetic capacity and the improved growth in the mixed stand could be attributed primarily to the (i) more competitive strategies for soil water use, (ii) stronger antioxidant systems, and (iii) higher leaf total nitrogen and chlorophyll contents in the plants. These findings suggest that mixed growth has beneficial effects on the leaf photosynthesis capacity and physiological resistance of moso bamboo and Chinese fir.

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“…of LEF fl at the highest irradiance, 800 µmol m −2 s −1 . Cyclic electron transport is a significant contributor to (1) the resistance of cotton to high-light stress, facilitating movement of cotton leaves to track the sun and intercept more radiation (Yao et al 2018) and 2improving the stability of the two photosystems under mild water deficit conditions (Yi et al 2018).…”

Section: Estimation Of Cef From the Difference Between Etr1 And Lef Flmentioning

confidence: 99%

Optimising the linear electron transport rate measured by chlorophyll a fluorescence to empirically match the gross rate of oxygen evolution in white light: towards improved estimation of the cyclic electron flux around photosystem I in leaves

Zhang

Fan

Guang-yu

et al. 2018

Functional Plant Biol.

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The cyclic electron flux (CEF) around photosystem I (PSI) was discovered in isolated chloroplasts more than six decades ago, but its quantification has been hampered by the absence of net formation of a product or net consumption of a substrate. We estimated in vivo CEF in leaves as the difference (ΔFlux) between the total electron flux through PSI (ETR1) measured by a near infrared signal, and the linear electron flux through both photosystems by optimised measurement of chlorophyll a fluorescence (LEFfl). Chlorophyll fluorescence was excited by modulated green light from a light-emitting diode at an optimal average irradiance, and the fluorescence was detected at wavelengths >710 nm. In this way, LEFfl matched the gross rate of oxygen evolution multiplied by 4 (LEFO2) in broad-spectrum white actinic irradiance up to half (spinach, poplar and rice) or one third (cotton) of full sunlight irradiance. This technique of estimating CEF can be applied to leaves attached to a plant.

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Changes in activities of both photosystems and the regulatory effect of cyclic electron flow in field-grown cotton ( Gossypium hirsutum L) under water deficit

Cited by 23 publications

References 57 publications

Role of Suillus placidus in Improving the Drought Tolerance of Masson Pine (Pinus massoniana Lamb.) Seedlings

Role of Suillus placidus in Improving the Drought Tolerance of Masson Pine (Pinus massoniana Lamb.) Seedlings

Growing in Mixed Stands Increased Leaf Photosynthesis and Physiological Stress Resistance in Moso Bamboo and Mature Chinese Fir Plantations

Optimising the linear electron transport rate measured by chlorophyll a fluorescence to empirically match the gross rate of oxygen evolution in white light: towards improved estimation of the cyclic electron flux around photosystem I in leaves

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