School of Agronomy, Anhui Agricultural University, Hefei, 230036, China.
Tasmanian Institute of Agriculture, University of Tasmania, Hobart, Australia.
Plant Physiol Biochem. 2021 Jan;158:53-64. doi: 10.1016/j.plaphy.2020.11.044. Epub 2020 Nov 27.
Brassica genus comprises numerous cultivated brassica species with various economic importance. Salt stress is an overwhelming problem causing serious losses in Brassica species (e.g. B. napus, B. rapa, B. oleracea, B. juncea) growth and grain yield production by inducing ionic and ROS toxicity. Given that a significant variation exists in salt tolerance level in Brassica genus, Brassica species exhibited numerous salt tolerance mechanisms which were either overlooked or given less importance to improve and understand innate salt stress tolerance mechanism in Brassica species. In this review, we tried to highlight the importance and recent findings relating to some overlooked and potential mechanisms such as role of neurotransmitters, and role of cytosolic Ca and ROS as signaling elements to enhance salt stress tolerance. Studies revealed that salt tolerant brassica species retained more K in leaf mesophyll which confers overall salinity tolerance in salt tolerance brassica species. Neurotransmitter such as melatonin, dopamiane and eATP regulates K and Ca permeable ion channels and plays a very crucial role in ionic homeostasis under salinity stress in brassica. At the end, the numerous possible salt stress agronomic strategies were also discussed to mitigate the severity of the salt stress in Brassica species.
芸薹属包括许多具有不同经济重要性的栽培芸薹种。盐胁迫是一个压倒性的问题，通过诱导离子和 ROS 毒性，严重影响芸薹属物种（如油菜、白菜、甘蓝、芥菜）的生长和籽粒产量。鉴于芸薹属物种的耐盐性水平存在显著差异，芸薹属物种表现出许多耐盐机制，这些机制要么被忽视，要么被忽视，无法提高和理解芸薹属物种固有的耐盐胁迫机制。在这篇综述中，我们试图强调一些被忽视的和潜在的机制的重要性和最新发现，如神经递质的作用、细胞质 Ca 和 ROS 作为信号元件的作用，以增强耐盐性。研究表明，耐盐芸薹种在叶片叶肉中保留更多的 K，这赋予了耐盐芸薹种整体耐盐性。神经递质如褪黑素、多巴胺和 eATP 调节 K 和 Ca 通透性离子通道，在盐胁迫下对离子稳态发挥非常关键的作用。最后，还讨论了许多可能的耐盐农艺策略，以减轻芸薹属物种盐胁迫的严重程度。
