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干旱是造成作物减产的主要非生物胁迫之一。在干旱胁迫下提高作物产量是作物育种的主要目标，对粮食安全至关重要。近年来，人们对植物的抗旱性机理进行了深入的研究，并鉴定出了多种抗旱性基因，但将这些知识从实验室推广到田间生产仍然是一个巨大的挑战。近年来，一些新的战略因其成本低、操作方便、现场可操作性强、环境友好等优点成为研究前沿。 在干旱胁迫下，外源植物生长调节剂(PGR)处理和基于微生物的植物生物技术可以有效地提高作物的抗旱性和保产量。然而，我们对PGRs调控植物抗旱性的机制以及干旱条件下植物与微生物间相互作用的机制还不完全了解。 本文就这两种外源处理调控作物抗旱性的机制进行了综述。最后，讨论了作物抗旱育种面临的挑战和未来的发展方向。
关注公众号：PaperRSS 植物进展 Drought is one of the main abiotic stresses that cause crop yield loss. Improving crop yield under drought stress is a major goal of crop breeding, as it is critical to food security. The mechanism of plant drought resistance has been well studied, and diverse drought resistance genes have been identified in recent years, but transferring this knowledge from the laboratory to field production remains a significant challenge. Recently, some new strategies have become research frontiers owing to their advantages of low cost, convenience, strong field operability, and/or environmental friendliness. Exogenous plant growth regulator （PGR） treatment and microbe-based plant biotechnology have been used to effectively improve crop drought tolerance and preserve yield under drought stress. However, our understanding of the mechanisms by which PGRs regulate plant drought resistance and of plant-microbiome interactions under drought is still incomplete. In this review, we summarize these two strategies reported in recent studies, focusing on the mechanisms by which these exogenous treatments regulate crop drought resistance. Finally, future challenges and directions in crop drought resistance breeding are discussed. 关注公众号：PaperRSS 植物进展
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