Abstract：
UNASSIGNED: Plant bioregulators play an important role in managing oxidative stress tolerance in plants. Utilizing their ability in stress sensitive crops through genetic engineering will be a meaningful approach to manage food production under the threat of climate change. Exploitation of the plant defense system against oxidative stress to engineer tolerant plants in the climate change scenario is a sustainable and meaningful strategy. Plant bioregulators (PBRs), which are important biotic factors, are known to play a vital role not only in the development of plants, but also in inducing tolerance in plants against various environmental extremes. These bioregulators include auxins, gibberellins, cytokinins, abscisic acid, brassinosteroids, polyamines, strigolactones, and ascorbic acid and provide protection against the oxidative stress-associated reactive oxygen species through modulation or activation of a plant\'s antioxidant system. Therefore, exploitation of their functioning and accumulation is of considerable significance for the development of plants more tolerant of harsh environmental conditions in order to tackle the issue of food security under the threat of climate change. Therefore, this review summarizes a new line of evidence that how PBRs act as inducers of oxidative stress resistance in plants and how they could be modulated in transgenic crops via introgression of genes. Reactive oxygen species production during oxidative stress events and their neutralization through an efficient antioxidants system is comprehensively detailed. Further, the use of exogenously applied PBRs in the induction of oxidative stress resistance is discussed. Recent advances in engineering transgenic plants with modified PBR gene expression to exploit the plant defense system against oxidative stress are discussed from an agricultural perspective.
摘要：
■植物生物调节剂在管理植物的氧化应激耐受性中起着重要作用。通过基因工程利用其在胁迫敏感作物中的能力将是在气候变化威胁下管理粮食生产的有意义的方法。开发抗氧化应激的植物防御系统以在气候变化情景中设计耐性植物是一种可持续且有意义的策略。植物生物调节剂（PBRs），是重要的生物因子，众所周知，不仅在植物的发育中起着至关重要的作用，还可以诱导植物对各种极端环境的耐受性。这些生物调节剂包括生长素，赤霉素,细胞分裂素,脱落酸，油菜素类固醇,多胺,stragolactones,和抗坏血酸，并通过调节或激活植物的抗氧化系统来提供对氧化应激相关活性氧的保护。因此,开发它们的功能和积累对于开发更耐受恶劣环境条件的植物以解决气候变化威胁下的粮食安全问题具有重要意义。因此,这篇综述总结了一系列新的证据，表明PBR如何在植物中充当氧化应激抗性的诱导剂，以及如何通过基因渗入在转基因作物中调节它们。全面详细介绍了氧化应激事件期间的活性氧产生及其通过有效的抗氧化剂系统的中和作用。Further,讨论了外源应用PBR在诱导氧化应激抗性中的用途。从农业角度讨论了具有改良PBR基因表达的工程化转基因植物以利用植物抵抗氧化应激的防御系统的最新进展。
