Melatonin enhances drought resistance by regulating leaf stomatal behaviour, root growth and catalase activity in two contrasting rapeseed (Brassica napus L.) genotypes

Dai, Lulu; Li, Jun; Harmens, Harry; Zheng, Xiaodong; Zhang, Chunlei

doi:10.1016/j.plaphy.2020.01.039

Cited by 105 publications

(65 citation statements)

References 48 publications

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“…It seems that melatonin as a novel plant growth regulator, independently of auxin signaling, plays a pivotal role in shoot and root growth and development [ 10 , 11 ]. Although melatonin at a lower level improves growth and development, a higher level of this plant growth regulator has an inhibitory function; therefore, melatonin can be considered as a dose-dependent growth regulator [ 55 ].…”

Section: Discussionmentioning

confidence: 99%

The application of artificial neural networks in modeling and predicting the effects of melatonin on morphological responses of citrus to drought stress

Jafari

Shahsavar

2020

PLoS ONE

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Drought stress as one of the most devastating abiotic stresses affects agricultural and horticultural productivity in many parts of the world. The application of melatonin can be considered as a promising approach for alleviating the negative impact of drought stress. Modeling of morphological responses to drought stress can be helpful to predict the optimal condition for improving plant productivity. The objective of the current study is modeling and predicting morphological responses (leaf length, number of leaves/plants, crown diameter, plant height, and internode length) of citrus to drought stress, based on four input variables including melatonin concentrations, days after applying treatments, citrus species, and level of drought stress, using different Artificial Neural Networks (ANNs) including Generalized Regression Neural Network (GRNN), Radial basis function (RBF), and Multilayer Perceptron (MLP). The results indicated a higher accuracy of GRNN as compared to RBF and MLP. The great accordance between the experimental and predicted data of morphological responses for both training and testing processes support the excellent efficiency of developed GRNN models. Also, GRNN was connected to Non-dominated Sorting Genetic Algorithm-II (NSGA-II) to optimize input variables for obtaining the best morphological responses. Generally, the validation experiment showed that ANN-NSGA-II can be considered as a promising and reliable computational tool for studying and predicting plant morphological and physiological responses to drought stress.

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Section: Discussionmentioning

confidence: 99%

The application of artificial neural networks in modeling and predicting the effects of melatonin on morphological responses of citrus to drought stress

Jafari

Shahsavar

2020

PLoS ONE

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“…Plant tolerance to drought mainly depends on the minimization of water loss through the regulation of stomatal aperture (Gilbert and Medina, 2016). Nonetheless, water status adjustments in response to drought directly affect photosynthesis and other physiological processes in plants (Ding et al ., 2014; Hatfield and Dold, 2019; Dai et al ., 2020). In the current study, drought decreased the Pn and Tr, which were attributed to the simultaneous decrease in Gs in tomato plants, suggesting the effect of stomatal limitation on the drought‐induced reduction in CO 2 assimilation.…”

Section: Discussionmentioning

confidence: 99%

“…However, silencing SlWRKY81 mitigated the reduction in Pn, but decreased the Tr, by further reducing the Gs compared with the pTRV plants (Figure 3). The suppression of SlWRKY81 delicately balanced water vapor efflux and CO 2 influx by precisely modulating the stomatal movement, which maintained photosynthesis under drought conditions (Cornic, 2000; Hatfield and Dold, 2019; Dai et al ., 2020). Higher Pn in SlWRKY81 ‐silenced plants indicates higher carbon fixation, which potentially contributed to growth and biomass accumulation under water deficit conditions (Figures 2 and 3).…”

Section: Discussionmentioning

confidence: 99%

“…Compared with the pTRV plants, a reverse change in Pn and Tr in SlWRKY81 ‐silenced plants in response to drought eventually resulted in an increased WUE (Hatfield and Dold, 2019). Besides, drought stress significantly decreased the Fv/Fm in tomato leaves, suggesting that deficit water supply might have induced photo‐inhibition or photo‐oxidative stress in tomato leaves (Liu et al ., 2016; Dai et al ., 2020; Li et al ., 2020). However, compared with the pTRV plants, silencing SlWRKY81 increased the Fv/Fm and protected the plants from photo‐oxidative damage as evidenced by the decreased ion leakage in SlWRKY81 ‐silenced plants under drought (Figure 2).…”

Section: Discussionmentioning

confidence: 99%

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The SlWRKY81 transcription factor inhibits stomatal closure by attenuating nitric oxide accumulation in the guard cells of tomato under drought

Ahammed

Mao

et al. 2020

Physiologia Plantarum

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The WRKY transcription factors (TFs) play multifaceted roles in plant growth, development, and stress response. Previously, we found that SlWRKY81 negatively regulates tomato tolerance to drought; however, the mechanisms of stomatal regulation in response to drought remain largely unclear. Here, we showed that droughtinduced upregulation in the SlWRKY81 transcripts induced photoinhibition and reduced the net photosynthetic rate in tomato leaves. However, silencing SlWRKY81 alleviated those inhibitions and minimized the drought-induced damage. A timecourse of water loss showed that SlWRKY81 silencing significantly and consistently reduced leaf water loss, suggesting a role for SlWRKY81 in stomatal movement. Further analysis using light microscopy revealed that SlWRKY81 silencing significantly decreased stomatal aperture and increased the ratio of length to width of stomata under drought. Both biochemical assay and confocal laser scanning microscopy demonstrated that drought-induced upregulation in SlWRKY81 expression inhibited the nitric oxide (NO) accumulation in the guard cells, which was attributed to the simultaneous declines in the activity of nitrate reductase (NR) and NR expression in tomato leaves. The inspection of 3-kb sequences upstream of the predicted transcriptional start site of the NR identified three copies of the core W-box (TTGACC/T) sequence in the promoter region, indicating possible targets of SlWRKY81. Taken together, these data suggest that SlWRKY81 potentially represses NR transcription and thus reduces NO accumulation to attenuate stomatal closure and subsequent drought tolerance. These findings provide an improved understanding of the mechanism of WRKY-induced regulation of stomatal closure, which can be exploited in the future to enhance drought tolerance in crops. | INTRODUCTIONPlant growth, development, and productivity primarily depend on water availability. Deficit water supply results in drought that remarkably affects multiple plant physiological processes, leading to yield losses (de Vries et al., 2020). Drought is a major abiotic stress, limiting crop production around the world (Bartlett et al.,

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“…This plant hormone called "plant master regulator" due to its multiple biological roles as well as defensive roles under changing environmental conditions (Arnao and Hernández-Ruiz, 2019). These stressful conditions on plants include drought (Dai et al, 2020), salinity (Zahedi et al, 2020), heavy metals like chromium (Seleiman et al, 2020), heat stress (Jahan et al, 2020a) and oxidative stress (Jahan et al, 2020b). Under heat stress, melatonin could increase the tolerance of tomato seedlings towards heat stress through inducing the cycle of ascorbateglutathione,improving the defense mechanism of their antioxidants and re-program the metabolic of polyamine and nitric oxide biosynthesis pathways (Jahan et al, 2020a).…”

Section: Melatoninmentioning

confidence: 99%

Management of Heat Stress in Tomato Seedlings under Arid and Semi-Arid Regions: A Review

Abdalla¹,

Taha

El-Ramady

et al. 2020

EBSS

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T HE production of protected cultivation of vegetables could be considered as a sustainable solution in arid and semi-arid regions.These regions already suffer from raising temperature andthe global warmingwill aggravate this, whichrepresents a great challenge facing our universe nowadays. Hence, the production of vegetables and tomato under greenhouse system during the high temperatures may be considered a serious problem should be avoided in these arid zonesin summer due to heat stress.The heat stress may cause a lot of troubles for the tomato seedlings in greenhouses in summer starting with the photosynthetic rate, and the metabolism processes in seedlings and in turn the growth and development of these seedlings. Although studies have recognized heat stress on tomato seedlings, research has yet to systematically investigate the effect of heat stress on tomato seedlings in greenhouse in summer under arid and semi-arid regions particularly in developing countries, which their greenhouses have not any climate controllers. Therefore, the management of tomato seedlings may need to address the production problems caused by heat stress in greenhouse conditions particularly in arid and semi-arid zones

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Melatonin enhances drought resistance by regulating leaf stomatal behaviour, root growth and catalase activity in two contrasting rapeseed (Brassica napus L.) genotypes

Cited by 105 publications

References 48 publications

The application of artificial neural networks in modeling and predicting the effects of melatonin on morphological responses of citrus to drought stress

The application of artificial neural networks in modeling and predicting the effects of melatonin on morphological responses of citrus to drought stress

The SlWRKY81 transcription factor inhibits stomatal closure by attenuating nitric oxide accumulation in the guard cells of tomato under drought

Management of Heat Stress in Tomato Seedlings under Arid and Semi-Arid Regions: A Review

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