Leaf ontogeny strongly influences photosynthetic tolerance to drought and high temperature in Gossypium hirsutum

Chastain, Daryl R.; Snider, John L.; Choinski, John S.; Collins, Guy; Perry, Calvin D.; Whitaker, Jared R.; Grey, Timothy L.; Sorensen, Ronald B.; Iersel, Marc W. van; Byrd, Seth A.; Porter, Wesley

doi:10.1016/j.jplph.2016.05.003

Cited by 58 publications

(39 citation statements)

References 36 publications

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“…Other studies also addressed that previous exposure to drought stress increased photosynthetic tolerance (photosystem II thermostability) to high temperature in cotton leaves, especially in young leaves (Snider et al 2013, Chastain et al 2016. Despite higher Pn and photosynthate concentrations of subtending leaves, boll biomass was still lower for EW 3 relative to EC, indicating limited sucrose translocation from the subtending leaf to the developing boll, which agrees with work evaluating carbohydrate dynamics within developing cotton fibers (Chen et al 2017b).…”

Section: Discussionsupporting

confidence: 65%

“…Thus, the accumulation of evidence in the current study support our hypothesis that previous exposure to mild waterlogging stress during early boll development may improve tolerance of leaves to continuous elevated temperature later in development, which strengthens the case for cross‐acclimation between these two stressors. Other studies also addressed that previous exposure to drought stress increased photosynthetic tolerance (photosystem II thermostability) to high temperature in cotton leaves, especially in young leaves (Snider et al , Chastain et al ). Despite higher P n and photosynthate concentrations of subtending leaves, boll biomass was still lower for EW 3 relative to EC, indicating limited sucrose translocation from the subtending leaf to the developing boll, which agrees with work evaluating carbohydrate dynamics within developing cotton fibers (Chen et al ).…”

Section: Discussionmentioning

confidence: 99%

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Carbohydrate metabolism in the subtending leaf cross‐acclimates to waterlogging and elevated temperature stress and influences boll biomass in cotton (Gossypium hirsutum)

Wang

Chen

et al. 2017

Physiologia Plantarum

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Short-term waterlogging and chronic elevated temperature occur concomitantly in the cotton (Gossypium hirsutum) growing season. While previous research about co-occurring waterlogging and elevated temperature has focused primarily on cotton fiber, no studies have investigated carbohydrate metabolism of the subtending leaf (a major source leaf for boll development) cross-acclimation to aforementioned stressors. To address this, plants were exposed to ambient (31.6/26.5°C) and elevated (34.1/29.0°C) temperatures during the whole flowering and boll formation stage, and waterlogging (0, 3, 6 days) beginning on the day of anthesis. Both waterlogging and high temperature limited boll biomass (reduced by 1.19-32.14%), but effects of different durations of waterlogging coupled with elevated temperature on carbohydrate metabolism in the subtending leaf were quite different. The 6-day waterlogging combined with elevated temperature had the most negative impact on net photosynthetic rate (Pn) and carbohydrate metabolism of any treatment, leading to upregulated GhSusA and GhSusC expression and enhanced sucrose synthase (SuSy, EC 2.4.1.13) activity for sucrose degradation. A prior exposure to waterlogging for 3 days improved subtending leaf performance under elevated temperature. Pn, sucrose concentrations, Rubisco (EC 4.1.1.39) activity, and cytosolic fructose-1,6-bisphosphatase (cy-FBPase, EC 3.1.3.11) activity in the subtending leaf significantly increased, while SuSy activity decreased under 3 days waterlogging and elevated temperature combined relative to elevated temperature alone. Thus, we concluded that previous exposure to a brief (3 days) waterlogging stress improved sucrose composition and accumulation cross-acclimation to high temperature later in development not only by promoting leaf photosynthesis but also inhibiting sucrose degradation.

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Section: Discussionsupporting

confidence: 65%

Section: Discussionmentioning

confidence: 99%

Carbohydrate metabolism in the subtending leaf cross‐acclimates to waterlogging and elevated temperature stress and influences boll biomass in cotton (Gossypium hirsutum)

Wang

Chen

et al. 2017

Physiologia Plantarum

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“…1 and 2) and ETR (Exp. This agrees closely with studies on field-grown cotton in which chlorophyll content in developing leaves increased as leaf area declined and specific leaf weight increased (Chastain et al, 2016). One limitation to the current study is that we are unable to distinguish between chloroplast and mitochondria-derived ATP.…”

Section: Discussionsupporting

confidence: 90%

Evaluating the Mechanisms of Photosynthetic Inhibition under Growth‐Limiting, Early‐Season Water Deficit Stress in Cotton

et al. 2019

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The current study evaluated the possibility that growth‐limiting, early‐season drought stress sufficient to decrease net photosynthesis (AN) would be associated with declines in stomatal conductance (gs) and ATP content, regardless of stress level. Studies were conducted in greenhouse facilities in Athens and Tifton, GA, and imposed different early‐season drought durations to generate a range of early‐season water‐deficit stress conditions. The early‐season drought durations imposed decreased AN to values ranging from 20 to 60% of the levels observed in well‐watered plants. Where declines in AN were observed, gs and photosynthetic electron transport rate (ETR) declined substantially, indicating some level of metabolic and possibly diffusional limitation to photosynthesis. The ATP content was unaffected or actually increased in response to photosynthesis‐limiting drought in both years of the study, suggesting that ATP‐induced limitations to photosynthesis are minimal over a broad range of AN–limiting, early‐season drought stress conditions in cotton (Gossypium hirsutum L.). All drought durations limited leaf, stem, reproductive, and total dry matter production. Declines in dry matter under mild stress were primarily associated decreased leaf area production, whereas decreased AN was likely an important contributor under more severely stressed treatments. Photosynthetic declines under growth‐limiting, early‐season drought do not appear to be associated with reduced ATP production, as suggested in other plant species.

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“…By comparison, at 5 WAP, significant, positive correlations were observed between A n and ETR, ETR a , ETR p , A g , R d , and g s but not between A n and ETR a /ETR p , C c , or C i (Table 7). Similarly, low A n in unexpanded leaves has been associated with lower g s and ETR in previous experiments (Chastain et al, 2016;Hall, Chastain, Horn, Chapman, & Choinski, 2014;Snider et al, 2009). However, while g s was strongly correlated with A n in this experiment, we cannot assume in this instance that low g s represents a diffusional limitation to photosynthesis since substomatal and chloroplast concentrations of CO 2 were not correlated with A n .…”

Section: Discussionsupporting

confidence: 69%

Associations between first true leaf physiology and seedling vigor in cotton under different field conditions

2020

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Rapid development of the first true leaf has been suggested as a key driver of seedling vigor in cotton, yet studies demonstrating an association between first true leaf physiological processes and early season cotton growth are limited. It was hypothesized that both first true leaf area (FTLA) and photosynthetic rates would be positively associated with cotton (Gossypium hirsutum and G. barbadense) seedling vigor, and that photosynthetic component processes would differ in their contribution to net photosynthesis (An) of the first true leaf. To test these hypotheses, three different cotton cultivars were planted in the 2017 and 2018 seasons on three selected dates each year to generate broad differences in seedling vigor. Growth analysis was conducted to assess seedling vigor at 3 and 5 wk after planting, and a combination of dark‐ and light‐adapted gas exchange and fluorescence measurements were performed on the first true leaf, concurrent with growth assessments. Seedling vigor was much more strongly associated with FTLA than An on a per unit leaf area basis, suggesting that FTLA was a stronger indicator of seedling vigor. Correlation analysis between An and a number of component processes derived from combined gas exchange and fluorescence measurements indicated that An was strongly correlated with electron transport rates and stomatal conductance. However, we suggest that most of the variability we observed in An of the first true leaf was primarily driven by nonstomatal factors, since no significant correlations between An and chloroplast CO2 concentration or substomatal CO2 concentration was apparent.

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Leaf ontogeny strongly influences photosynthetic tolerance to drought and high temperature in Gossypium hirsutum

Cited by 58 publications

References 36 publications

Carbohydrate metabolism in the subtending leaf cross‐acclimates to waterlogging and elevated temperature stress and influences boll biomass in cotton (Gossypium hirsutum)

Carbohydrate metabolism in the subtending leaf cross‐acclimates to waterlogging and elevated temperature stress and influences boll biomass in cotton (Gossypium hirsutum)

Evaluating the Mechanisms of Photosynthetic Inhibition under Growth‐Limiting, Early‐Season Water Deficit Stress in Cotton

Associations between first true leaf physiology and seedling vigor in cotton under different field conditions

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