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Strigolactones enhance apple drought resistance via the MsABI5-MsSMXL1-MsNAC022 cascade

IF 8.7 1区农林科学 Q1 Agricultural and Biological Sciences

Horticulture Research Pub Date : 2025-04-09 DOI:10.1093/hr/uhaf101

Xiang Zhang, BingYang Du, Maihemuti Turupu, Yuqin Xiao, Qisheng Yao, Shilin Gai, Qiaoqiao Zhang, Xinyu Wang, Yongzhen Yan, Zhengyang Wen, Shuo Wang, Wenjun Lu, Pengtao Yue, Tianhong Li

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引用次数: 0

Abstract

Drought stress limits plant growth, development, and yield in apple (Malus). Strigolactones (SLs) work with abscisic acid (ABA) to improve drought resistance in plants, but how this synergistic mechanism functions remains unclear. Here, we determined that SLs promote drought resistance in apple in an ABSCISIC ACID INSENSITIVE5 (MsABI5)-related manner. During drought stress of a wild apple species (Malus sieversii), SLs enhanced the expression of MsABI5, encoding a major transcription factor involved in ABA signaling. MsABI5 bound to the promoter of the gene encoding delta-1-pyrroline-5-carboxylate synthase (MsP5CS2.2), upregulating its expression and thereby enhancing proline accumulation and drought resistance. In addition, MsABI5 suppressed the expression of MsSMXL1, encoding a major transcriptional repressor involved in SL signaling. MsSMXL1 interacted with MsNAC022 instead of MsABI5 to repress the transactivation activity of MsNAC022. MsNAC022 was upregulated by MsABI5, and MsNAC022 directly promoted MsP5CS2.2 expression to enhance proline accumulation and drought resistance. These findings suggest that MsSMXL1 and MsNAC022 comprise a regulatory node downstream of MsABI5 during drought stress in apple. Together, our findings suggest that in apple, SLs increase drought resistance by activating the MsABI5-MsSMXL1-MsNAC022 cascade.

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单抗内酯通过MsABI5-MsSMXL1-MsNAC022级联增强苹果抗旱性

干旱胁迫限制了苹果（苹果）植株的生长发育和产量。单抗内酯（SLs）可与脱落酸（ABA）协同提高植物抗旱性，但其协同作用机制尚不清楚。在这里，我们确定了SLs以ABSCISIC ACID INSENSITIVE5 （MsABI5）相关的方式促进苹果抗旱性。在干旱胁迫下，SLs增强了一种野生苹果（Malus sieversii）的MsABI5的表达，MsABI5编码了一种参与ABA信号传导的主要转录因子。MsABI5与编码δ -1-吡啶-5-羧酸合成酶基因（MsP5CS2.2）的启动子结合，上调其表达，从而增强脯氨酸积累和抗旱性。此外，MsABI5抑制MsSMXL1的表达，MsSMXL1编码一个参与SL信号传导的主要转录抑制因子。MsSMXL1代替MsABI5与MsNAC022相互作用，抑制MsNAC022的转激活活性。MsNAC022被MsABI5上调，MsNAC022直接促进MsP5CS2.2的表达，增强脯氨酸积累和抗旱性。这些研究结果表明，在干旱胁迫下，MsSMXL1和MsNAC022构成了MsABI5下游的一个调控节点。总之，我们的研究结果表明，在苹果中，SLs通过激活MsABI5-MsSMXL1-MsNAC022级联来增强抗旱性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Horticulture Research

Horticulture Research Biochemistry, Genetics and Molecular Biology-Biochemistry

CiteScore

11.20

自引率

6.90%

发文量

367

审稿时长

20 weeks

期刊介绍： Horticulture Research, an open access journal affiliated with Nanjing Agricultural University, has achieved the prestigious ranking of number one in the Horticulture category of the Journal Citation Reports ™ from Clarivate, 2022. As a leading publication in the field, the journal is dedicated to disseminating original research articles, comprehensive reviews, insightful perspectives, thought-provoking comments, and valuable correspondence articles and letters to the editor. Its scope encompasses all vital aspects of horticultural plants and disciplines, such as biotechnology, breeding, cellular and molecular biology, evolution, genetics, inter-species interactions, physiology, and the origination and domestication of crops.

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