Combined effects of drought and high temperature on photosynthetic characteristics in four winter wheat genotypes

Urban, Otmar; Hlaváčová, Marcela; Klem, Karel; Novotná, Kateřina; Rapantová, Barbora; Smutná, Pavlína; Horáková, Vladimíra; Hlavinka, Petr; Škarpa, Petr; Trnka, Miroslav

doi:10.1016/j.fcr.2018.02.029

Cited by 72 publications

(43 citation statements)

References 53 publications

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“…Second, we have shown that the combined action of water deficit and elevated temperatures (i.e., drought stress sensu stricto ) was much likely responsible for the large impairment of PSII photochemistry (and photosynthesis) in plants growing in full sunlight, as previously reported in a range of species [59,60,61,62]. In our study, leaf water potential was lower indeed, whereas leaf temperature was substantially higher in sun (midday leaf T averaged 34.9 °C) than in shade (leaf T was on average 31.8 °C) leaves.…”

Section: Discussionsupporting

confidence: 70%

Dissecting Adaptation Mechanisms to Contrasting Solar Irradiance in the Mediterranean Shrub Cistus incanus

Sebastiani

Torre

Gori

et al. 2019

IJMS

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Molecular mechanisms that are the base of the strategies adopted by Mediterranean plants to cope with the challenges imposed by limited or excessive solar radiation during the summer season have received limited attention. In our study, conducted on C. incanus plants growing in the shade or in full sunlight, we performed measurements of relevant physiological traits, such as leaf water potential, gas exchange and PSII photochemistry, RNA-Seq with de-novo assembly, and the analysis of differentially expressed genes. We also identified and quantified photosynthetic pigments, abscisic acid, and flavonoids. Here, we show major mechanisms regulating light perception and signaling which, in turn, sustain the shade avoidance syndrome displayed by the ‘sun loving’ C. incanus. We offer clear evidence of the detrimental effects of excessive light on both the assembly and the stability of PSII, and the activation of a suite of both repair and effective antioxidant mechanisms in sun-adapted leaves. For instance, our study supports the view of major antioxidant functions of zeaxanthin in sunny plants concomitantly challenged by severe drought stress. Finally, our study confirms the multiple functions served by flavonoids, both flavonols and flavanols, in the adaptive mechanisms of plants to the environmental pressures associated to Mediterranean climate.

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Section: Discussionsupporting

confidence: 70%

Dissecting Adaptation Mechanisms to Contrasting Solar Irradiance in the Mediterranean Shrub Cistus incanus

Sebastiani

Torre

Gori

et al. 2019

IJMS

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“…These decreases predispose leaves to photoinhibitory damage due to decreased energy use through photosynthesis ( Baker and Rosenqvist, 2004 ; Lambers et al., 2008 ; Haworth et al., 2018 ), which can be exacerbated when these stresses are superimposed. As a consequence, growth and productivity of agricultural crops are depressed under these conditions to a greater extent than to each single applied stress ( Sehgal et al., 2017 ; Urban et al., 2018 ). Additionally, the type and magnitude of plant responses to combined stresses usually differ from the responses triggered by single stress exposure ( Mittler, 2006 ; Sehgal et al., 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Resilient and Sensitive Key Points of the Photosynthetic Machinery of Coffea spp. to the Single and Superimposed Exposure to Severe Drought and Heat Stresses

et al. 2020

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This study unveils the single and combined drought and heat impacts on the photosynthetic performance of Coffea arabica cv. Icatu and C. canephora cv. Conilon Clone 153 (CL153). Well-watered (WW) potted plants were gradually submitted to severe water deficit (SWD) along 20 days under adequate temperature (25/20°C, day/night), and thereafter exposed to a gradual temperature rise up to 42/30°C, followed by a 14-day water and temperature recovery. Single drought affected all gas exchanges (including A max) and most fluorescence parameters in both genotypes. However, Icatu maintained F v /F m and RuBisCO activity, and reinforced electron transport rates, carrier contents, and proton gradient regulation (PGR5) and chloroplast NADH dehydrogenase-like (NDH) complex proteins abundance. This suggested negligible non-stomatal limitations of photosynthesis that were accompanied by a triggering of protective cyclic electron transport (CEF) involving both photosystems (PSs). These findings contrasted with declines in RuBisCO and PSs activities, and cytochromes (b 559 , f, b 563) contents in CL153. Remarkable heat tolerance in potential photosynthetic functioning was detected in WW plants of both genotypes (up to 37/28°C or 39/30°C), likely associated with CEF in Icatu. Yet, at 42/30°C the tolerance limit was exceeded. Reduced A max and increased C i

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“…The first four of these factors are environmental, and the remaining factors are chlorophyll fluorescence parameters that are significantly related to the net photosynthetic rate (with the exceptions of qN). Based on the correlations between the environmental factors and photosynthesis, we found that the air temperature affects the activity of enzymes involved in photosynthesis, the crop transpiration rate and stomatal conductance 20,21 . These may in turn affect photosynthesis in crop plants.…”

Section: Discussionmentioning

confidence: 99%

Photosynthetic rate prediction model of newborn leaves verified by core fluorescence parameters

Zhang

et al. 2020

Sci Rep

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Due to the imperfect development of the photosynthetic apparatus of the newborn leaves of the canopy, the photosynthesis ability is insufficient, and the photosynthesis intensity is not only related to the external environmental factors, but also significantly related to the internal mechanism characteristics of the leaves. Light suppression and even light destruction are likely to occur when there is too much external light. Therefore, focus on the newborn leaves of the canopy, the accurate construction of photosynthetic rate prediction model based on environmental factor analysis and fluorescence mechanism characteristic analysis has become a key problem to be solved in facility agriculture. According to the above problems, a photosynthetic rate prediction model of newborn leaves in canopy of cucumber was proposed. The multi-factorial experiment was designed to obtain the multi-slice large-sample data of photosynthetic and fluorescence of newborn leaves. The correlation analysis method was used to obtain the main environmental impact factors as model inputs, and core chlorophyll fluorescence parameters was used for auxiliary verification. The best modeling method PSO-BP neural network was used to construct the newborn leaf photosynthetic rate prediction model. The validation results show that the net photosynthetic rate under different environmental factors of cucumber canopy leaves can be accurately predicted. The coefficient of determination between the measured values and the predicted values of photosynthetic rate was 0.9947 and the root mean square error was 0.8787. Meanwhile, combined with the core fluorescence parameters to assist the verification, it was found that the fluorescence parameters can accurately characterize crop photosynthesis. Therefore, this study is of great significance for improving the precision of light environment regulation for new leaf of facility crops.

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Combined effects of drought and high temperature on photosynthetic characteristics in four winter wheat genotypes

Cited by 72 publications

References 53 publications

Dissecting Adaptation Mechanisms to Contrasting Solar Irradiance in the Mediterranean Shrub Cistus incanus

Dissecting Adaptation Mechanisms to Contrasting Solar Irradiance in the Mediterranean Shrub Cistus incanus

Resilient and Sensitive Key Points of the Photosynthetic Machinery of Coffea spp. to the Single and Superimposed Exposure to Severe Drought and Heat Stresses

Photosynthetic rate prediction model of newborn leaves verified by core fluorescence parameters

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