Drought priming-induced stress memory improves subsequent drought or heat tolerance via activation of γ-aminobutyric acid-regulated pathways in creeping bentgrass.

IF 4.2 3区 生物学 Q1 PLANT SCIENCES
Plant Biology Pub Date : 2024-03-21 DOI:10.1111/plb.13636
Y Yuan, M Tan, M Zhou, M J Hassan, L Lin, J Lin, Y Zhang, Z Li
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Abstract

Recurrent drought can induce stress memory in plants to induce tolerance to subsequent stress, such as high temperature or drought. Drought priming (DP) is an effective approach to improve tolerance to various stresses; however, the potential mechanism of DP-induced stress memory has not been fully resoved. We examined DP-regulated subsequent drought tolerance or thermotolerance associated with changes in physiological responses, GABA and NO metabolism, heat shock factor (HSF) and dehydrin (DHN) pathways in perennial creeping bentgrass. Plants can recover after two cycle of DP, and DP-treated plants had significantly higher tolerance to subsequent drought or heat stress, with higher leaf RWC, Chl content, photochemical efficiency, and cell membrane stability. DP significantly alleviated oxidative damage through enhancing total antioxidant capacity in response to subsequent drought or heat stress. Endogenous GABA was significantly increased by DP through activating glutamic acid decarboxylase activity and inhibiting GABA transaminase activity. DP also enhanced accumulation of NO, depending on NOS activity, under subsequent drought or heat stress. Transcript levels of multiple transcription factors, heat shock proteins, and DHNs in the HSF and DHN pathways were up-regulated by DP under drought or heat stress, but there were differences between DP-regulated heat tolerance and drought tolerance in these pathways. The findings indicate that under recurrent moderate drought, DP improves subsequent tolerance to drought or heat stress in relation to GABA-regulated pathways, providing new insight into understanding of the role of stress memory in plant adaptation to complex environmental stresses.

Abstract Image

干旱启动诱导的应激记忆通过激活γ-氨基丁酸调控的途径提高匍匐翦股颖随后的耐旱或耐热性。
反复干旱可诱导植物产生胁迫记忆,从而诱导其对高温或干旱等后续胁迫的耐受性。干旱诱导(DP)是提高对各种胁迫耐受性的有效方法;然而,DP诱导胁迫记忆的潜在机制尚未得到充分研究。我们研究了多年生匍匐翦股颖的生理反应、GABA和NO代谢、热休克因子(HSF)和脱水素(DHN)途径变化相关的DP调控的后续耐旱性或耐热性。经过两个周期的DP处理后,植株可以恢复,DP处理的植株对随后的干旱或热胁迫的耐受性显著提高,叶片RWC、叶绿素含量、光化学效率和细胞膜稳定性都有所提高。在随后的干旱或热胁迫下,DP通过提高总抗氧化能力明显减轻了氧化损伤。通过激活谷氨酸脱羧酶活性和抑制 GABA 转氨酶活性,DP 能显著增加内源 GABA。在随后的干旱或热胁迫下,DP还能增强NO的积累,这取决于NOS的活性。在干旱或热胁迫下,DP 上调了 HSF 和 DHN 通路中多个转录因子、热休克蛋白和 DHN 的转录水平,但在这些通路中,DP 调节的耐热性与耐旱性存在差异。研究结果表明,在反复中度干旱条件下,DP能提高植物随后对干旱或热胁迫的耐受性,这与GABA调控的途径有关,为了解胁迫记忆在植物适应复杂环境胁迫中的作用提供了新的视角。
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来源期刊
Plant Biology
Plant Biology 生物-植物科学
CiteScore
8.20
自引率
2.60%
发文量
109
审稿时长
3 months
期刊介绍: Plant Biology is an international journal of broad scope bringing together the different subdisciplines, such as physiology, molecular biology, cell biology, development, genetics, systematics, ecology, evolution, ecophysiology, plant-microbe interactions, and mycology. Plant Biology publishes original problem-oriented full-length research papers, short research papers, and review articles. Discussion of hot topics and provocative opinion articles are published under the heading Acute Views. From a multidisciplinary perspective, Plant Biology will provide a platform for publication, information and debate, encompassing all areas which fall within the scope of plant science.
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