Implication of nitric oxide and hydrogen sulfide signalling in alleviating arsenate stress in rice seedlings

Mishra, Vipul; Singh, Vijay Pratap

doi:10.1016/j.envpol.2021.117958

Cited by 30 publications

(1 citation statement)

References 61 publications

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“…Research interests have focused on it being documented as an important gaseous signaling molecule in plants and revealed its numerous physiological processes, ranging from germination, stomatal movement, leaf senescence, and responses to confer tolerance toward environmental stress, etc. (Ding et al., 2019; Jin et al., 2013; Mishra & Singh, 2021; Shivaraj et al., 2020; Zhang et al., 2021; Zhao et al., 2020). More recently, H 2 S has been emphasized for its regulation in plant growth, including root development (Li et al., 2018; Xuan et al., 2020).…”

Section: Discussionmentioning

confidence: 99%

Hydrogen sulfide alleviates osmotic stress‐induced root growth inhibition by promoting auxin homeostasis

Xiang

et al. 2023

The Plant Journal

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Hydrogen sulfide (H 2 S) promotes plant tolerance against various environmental cues, and D-cysteine desulfhydrase (DCD) is an enzymatic source of H 2 S to enhance abiotic stress resistance. However, the role of DCDmediated H 2 S production in root growth under abiotic stress remains to be further elucidated. Here, we report that DCD-mediated H 2 S production alleviates osmotic stress-mediated root growth inhibition by promoting auxin homeostasis. Osmotic stress up-regulated DCD gene transcript and DCD protein levels and thus H 2 S production in roots. When subjected to osmotic stress, a dcd mutant showed more severe root growth inhibition, whereas the transgenic lines DCDox overexpressing DCD exhibited less sensitivity to osmotic stress in terms of longer root compared to the wild-type. Moreover, osmotic stress inhibited root growth through repressing auxin signaling, whereas H 2 S treatment significantly alleviated osmotic stressmediated inhibition of auxin. Under osmotic stress, auxin accumulation was increased in DCDox but decreased in dcd mutant. H 2 S promoted auxin biosynthesis gene expression and auxin efflux carrier PIN-FORMED 1 (PIN1) protein level under osmotic stress. Taken together, our results reveal that mannitolinduced DCD and H 2 S in roots promote auxin homeostasis, contributing to alleviating the inhibition of root growth under osmotic stress.

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