24-Epibrassinosteroid alleviate drought-induced inhibition of photosynthesis in Capsicum annuum

Hu, Wenhai; Yan, Xiaohong; Xiao, Yuchen; ZENG, J.J.; Qi, Hui-juan; Ogweno, Joshua Otieno

doi:10.1016/j.scienta.2012.11.012

Cited by 95 publications

(58 citation statements)

References 34 publications

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“…Signs of photoinhibition can be observed when Fv/Fm declines and thus a decrease of the photochemical efficiency of PSII, called the 'down-regulation of photochemistry', occurs, revealing permanent photoinhibition [47][48][49]. Furthermore, the increase in NPQ provides protection against damage by excessive energy, in agreement with previous studies on grapes [40], pepper [50] and Amur grapes (Vitis Amurensis Rupr.) [51].…”

Section: Discussionsupporting

confidence: 88%

Estimation of Water Stress in Grapevines Using Proximal and Remote Sensing Methods

et al. 2018

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Abstract:In light of climate change and its impacts on plant physiology, optimizing water usage and improving irrigation practices play a crucial role in crop management. In recent years, new optical remote sensing techniques have become widespread since they allow a non-invasive evaluation of plant water stress dynamics in a timely manner. Unmanned aerial vehicles (UAV) currently represent one of the most advanced platforms for remote sensing applications. In this study, remote and proximal sensing measurements were compared with plant physiological variables, with the aim of testing innovative services and support systems to farmers for optimizing irrigation practices and scheduling. The experiment, conducted in two vineyards located in Sardinia, Italy, consisted of two regulated deficit irrigation (RDI) treatments and two reference treatments maintained under stress and well-watered conditions. Indicators of crop water status (Crop Water Stress Index-CWSI-and linear thermal index) were calculated from UAV images and ground infrared thermal images and then related to physiological measurements. The CWSI values for moderate water deficit (RDI-1) were 0.72, 0.28 and 0.43 for 'Vermentino', 'Cabernet' and 'Cagnulari' respectively, while for severe (RDI-2) water deficit the values were 0.90, 0.34 and 0.51. The highest differences for net photosynthetic rate (Pn) and stomatal conductance (Gs) between RDI-1 and RDI-2 were observed in 'Vermentino'. The highest significant correlations were found between CWSI with Pn (R = −0.80), with Φ PSII (R = −0.49) and with Fv'/Fm' (R = −0.48) on 'Cagnulari', while a unique significant correlation between CWSI and non-photochemical quenching (NPQ) (R = 0.47) was found on 'Vermentino'. Pn, as well as the efficiency of light use by the photosystem II (PSII), declined under stress conditions and when CWSI values increased. Under the experimental water stress conditions, grapevines were able to recover their efficiency during the night, activating a photosynthetic protection mechanism such as thermal energy dissipation (NPQ) to prevent irreversible damage to the photosystem. The results presented here demonstrate that CWSI values derived from remote and proximal sensors could be valuable indicators for the assessment of the spatial variability of crop water status in Mediterranean vineyards.

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Section: Discussionsupporting

confidence: 88%

Estimation of Water Stress in Grapevines Using Proximal and Remote Sensing Methods

et al. 2018

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“…Afzal et al (2014) evaluated the gas exchange of Vigna radiata plants under a water deficit and also found reductions in P N and g s . Hu et al (2013) reported that EBR application alleviates the negative effects on P N , E and g s in Capsicum annuum plants subjected to a water deficit.…”

Section: Discussionmentioning

confidence: 98%

Brassinosteroids improve photosystem II efficiency, gas exchange, antioxidant enzymes and growth of cowpea plants exposed to water deficit

Lima

Lobato

2017

Physiol Mol Biol Plants

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Water deficit is considered the main abiotic stress that limits agricultural production worldwide. Brassinosteroids (BRs) are natural substances that play roles in plant tolerance against abiotic stresses, including water deficit. This research aims to determine whether BRs can mitigate the negative effects caused by water deficiency, revealing how BRs act and their possible contribution to increased tolerance of cowpea plants to water deficit. The experiment was a factorial design with the factors completely randomised, with two water conditions (control and water deficit) and three levels of brassinosteroids (0, 50 and 100 nM 24-epibrassinolide; EBR is an active BRs). Plants sprayed with 100 nM EBR under the water deficit presented significant increases in U PSII , q P and ETR compared with plants subjected to the water deficit without EBR. With respect to gas exchange, P N , E and g s exhibited significant reductions after water deficit, but application of 100 nM EBR caused increases in these variables of 96, 24 and 33%, respectively, compared to the water deficit ? 0 nM EBR treatment. To antioxidant enzymes, EBR resulted in increases in SOD, CAT, APX and POX, indicating that EBR acts on the antioxidant system, reducing cell damage. The water deficit caused significant reductions in Chl a, Chl b and total Chl, while plants sprayed with 100 nM EBR showed significant increases of 26, 58 and 33% in Chl a, Chl b and total Chl, respectively. This study revealed that EBR improves photosystem II efficiency, inducing increases in U PSII , q P and ETR. This substance also mitigated the negative effects on gas exchange and growth induced by the water deficit. Increases in SOD, CAT, APX and POX of plants treated with EBR indicate that this steroid clearly increased the tolerance to the water deficit, reducing reactive oxygen species, cell damage, and maintaining the photosynthetic pigments. Additionally, 100 nM EBR resulted in a better dose-response of cowpea plants exposed to the water deficit.

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“…The brassinosteroid EBR is involved in the regulation of plant development and physiological processes under stress conditions (Yu et al 2004;Wang et al 2011;Xu et al 2015). Previous studies have demonstrated that EBR pretreatment significantly alleviates the inhibition of photosynthesis induced by high temperatures and drought (Ogweno et al 2008;Hu et al 2013). Brassinosteroid-induced improvements in photosynthesis might be related to stomatal or non-stomatal factors, or a combination of these (Ali et al 2008).…”

Section: Discussionmentioning

confidence: 99%

Effects of 2,4-epibrassinolide on photosynthesis and Rubisco activase gene expression in Triticum aestivum L. seedlings under a combination of drought and heat stress

Zhao

Zhang

et al. 2016

Plant Growth Regul

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24-Epibrassinosteroid alleviate drought-induced inhibition of photosynthesis in Capsicum annuum

Cited by 95 publications

References 34 publications

Estimation of Water Stress in Grapevines Using Proximal and Remote Sensing Methods

Estimation of Water Stress in Grapevines Using Proximal and Remote Sensing Methods

Brassinosteroids improve photosystem II efficiency, gas exchange, antioxidant enzymes and growth of cowpea plants exposed to water deficit

Effects of 2,4-epibrassinolide on photosynthesis and Rubisco activase gene expression in Triticum aestivum L. seedlings under a combination of drought and heat stress

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