Can the critical temperature for photochemical damage in common bean plants be changed after a drought event?

Ribeiro, Rafael Vasconcelos; Santos, Mariana; Pimentel, Carlos; Machado, Eduardo Caruso; Oliveira, Ricardo Ferraz de

doi:10.1590/1678-4499.0141

Cited by 3 publications

(4 citation statements)

References 26 publications

(45 reference statements)

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“…It is important to note that previous work has adopted similar strategies to assess the temperature response of F o and/or F v /F m (Schreiber and Berry, 1977; Lazár and Ilík, 1997; Xu et al ., 2014; Ribeiro et al ., 2015; Marias et al ., 2017); however, these studies were constrained by equipment issues, meaning at best only three species (Schreiber and Berry, 1977), genotypes (Xu et al ., 2014) or developmental stages (Marias et al ., 2017) were able to be compared in terms of their photosynthetic response to incrementally increasing temperatures. A fundamental aim of this present study was to determine the efficacy of the coefficients extracted from the segmented models for forecasting heat tolerance.…”

Section: Discussionmentioning

confidence: 99%

“…A further advance in this present study compared with the aforementioned studies is with respect to the determination of T crit or its equivalent. In all cited studies, T crit is calculated manually by the authors selecting the points that they best believe represent the slow and fast portions of the temperature‐dependent response, fitting linear models to those points and determining where those models transect (Schreiber and Berry, 1977; Lazár and Ilík, 1997; Xu et al ., 2014; Ribeiro et al ., 2015; Marias et al ., 2017). Through this approach, these studies introduce substantial human bias in their calculation of T crit .…”

Section: Discussionmentioning

confidence: 99%

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Rapid temperature responses of photosystem II efficiency forecast genotypic variation in rice vegetative heat tolerance

et al. 2020

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A key target for the improvement of Oryza sativa (rice) is the development of heat-tolerant varieties. This necessitates the development of high-throughput methodologies for the screening of heat tolerance. Progress has been made to this end via visual scoring and chlorophyll fluorescence; however, these approaches demand large infrastructural investments to expose large populations of adult plants to heat stress. To address this bottleneck, we investigated the response of the maximum quantum efficiency of photosystem II (PSII) to rapidly increasing temperatures in excised leaf segments of juvenile rice plants. Segmented models explained the majority of the observed variation in response. Coefficients from these models, i.e. critical temperature (T crit) and the initial response (m 1), were evaluated for their usability for forecasting adult heat tolerance, measured as the vegetative heat tolerance of adult rice plants through visual (stay-green) and chlorophyll fluorescence (ɸPSII) approaches. We detected substantial variation in heat tolerance of a randomly selected set of indica rice varieties. Both T crit and m 1 were associated with measured heat tolerance in adult plants, highlighting their usability as high-throughput proxies. Variation in heat tolerance was associated with daytime respiration but not with photosynthetic capacity, highlighting a role for the non-photorespiratory release of CO 2 in heat tolerance. To date, this represents the first published instance of genetic variation in these key gas-exchange traits being quantified in response to heat stress in a diverse set of rice accessions. These results outline an efficient strategy for screening heat tolerance and accentuate the need to focus on reduced rates of respiration to improve heat tolerance in rice.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Rapid temperature responses of photosystem II efficiency forecast genotypic variation in rice vegetative heat tolerance

et al. 2020

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“…The critical parameters of curves have been analyzed: minimal fluorescence, The stability of the photosynthetic apparatus of Fodder galega plants under artificial infection and foliage nanoaquacitrates treatment has been determined as the relative difference in F o and calculated as (F o (7-day)/F o (9-day)), while the sustainability of photochemical activity has been calculated as the quantum yield difference at photochemical energy conversion: (F v (7-day)/F v (9-day)). These parameters have also been used as indicators to evaluate stressful temperatures influence on photochemical apparatus [33].…”

Section: Methodsmentioning

confidence: 99%

Effect of Nanoaquacitrates on Physiological Parameters of Fodder Galega Infected with Phytoplasma

Huliaieva

Tokovenko

Максін

et al. 2018

Ecological Chemistry and Engineering S

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The laboratory experiments have been found that soaking seeds Galega orientalis L. (Fodder galega) in nanoaquacitrates solutions of Mn (10 and 20 mg/dm3), Mo (4 mg/dm3) and Mg (2 and 4 mg/dm3), has been lead to germination energy rise, while Mn (10 and 20 mg/dm3) and Mo (4 mg/dm3) concentrations has been influenced germinating ability. At the same time, the soaking seeds in solution of nanoaquacitrates Mn (20 mg/dm3) had the biggest stimulatory effect on the accumulation 7 daily sprouts mass (on 18%). It has been shown that soaking seeds in nanoparticles Mn and Mo solutions leads to the increase of catalase activities (especially under the influence of manganese) and peroxidase activities (under molybdenum influence). Applying the method of chlorophyll a fluorescence in the field and greenhouse experiments with Galega orientalis L. plants, artificial infected with phytoplasma Acholeplasma laidlawii var. granulum st. 118 the following changes in the photosynthetic apparatus has been indicated: reduction in the length of the light-antenna, blocking transport of electrons in plastoquinone pool PSII with reducing the pool of electron acceptors. It has also been indicated that photochemical activity resistance of the photosynthetic apparatus decreases while its stability increases, as result of described above effects the concentration of chlorophyll a and b in plants leaves decreases. The above-mentioned negative effects have been deactivated through foliar treatment of infected Galega orientalis L. plants with nanoaquacitrates solution Mo (4 mg/dm3) that allow increasing of photochemical resistance of photosynthetic apparatus as well as chlorophyll content in leaves. The foliar treatment with Mn (20 mg/dm3) solution of the infected plants, in compared with infected plants without treatment, resulted in more significant increase of Ki value (which correlate to the ribulose-1,5-bisphosphate carboxylase/oxygenase activity), which is explaining anti-mycoplasma effect of this solution.

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“…The experiment was carried in a greenhouse, located at coordinates: 19°12'49.5"S 46°13'57.8"W, between February and April 2017. The air temperature was kept between 21 °C and 38 °C to avoid potential photochemical damage (Ribeiro et al, 2015). The commom bean seeds were sown in plastic pots (5 dm³) containing a clayey oxisol that had the following chemical characteristics: Organic Matter: 22 g dm -³; P: 11.0 mg dm -³; K: 1.2 mmol dm -³; Ca: 18 mmol dm -³; Mg: 5.3 mmolc dm -³; pH 5.3.…”

Section: Experimental and Plant Growth Conditionsmentioning

confidence: 99%

Effect of foliar application of 24-epibrassinolide and salicylic acid on common bean plants grown under drought stress

Lopes

Nobre²,

Macedo³

2019

Emir J Food Agric

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The aim of this study was to evaluate the potential use of two bioregulators, 24-epibrassinolide (BR) and salicylic acid (SA), as attenuators of drought stress on common bean plants (Phaseolus vulgaris L.). This was done by subjecting the plants to three different soil moisture levels, and then analyzing: gas exchange by the leaves, enzymes of antioxidant metabolism (superoxide dismutase, catalase and ascorbate peroxidase), total soluble protein content, photosynthetic pigments, relative leaf water content, and biometric parameters. Neither SA nor BR had significant effects on the parameters of gas exchange and photosynthetic pigments, but they helped to regulate the levels of hydrogen peroxide in the plants, by adjusting both ascorbate peroxidase activity and catalase activity. Therefore, SA and BR are considered to be useful treatments for increasing tolerance to water stress in common bean plants, because their use caused improvements in the plants’ protective mechanisms against drought stress, without any detrimental side effects.

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Can the critical temperature for photochemical damage in common bean plants be changed after a drought event?

Cited by 3 publications

References 26 publications

Rapid temperature responses of photosystem II efficiency forecast genotypic variation in rice vegetative heat tolerance

Rapid temperature responses of photosystem II efficiency forecast genotypic variation in rice vegetative heat tolerance

Effect of Nanoaquacitrates on Physiological Parameters of Fodder Galega Infected with Phytoplasma

Effect of foliar application of 24-epibrassinolide and salicylic acid on common bean plants grown under drought stress

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