The MdIAA29-MdARF4 complex plays an important role in balancing plant height with salt and drought stress responses.

IF 6.5 1区 生物学 Q1 PLANT SCIENCES
Yingying Lei, Cui Chen, Wenjun Chen, Hongyan Dai
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引用次数: 0

Abstract

Breeding dwarf apple (Malus domestica) varieties is a recent trend in agriculture because such varieties are easy to maintain and have high yields; however, dwarf apple trees generally have poor stress tolerance. Balancing apple plant height and stress response has been an important breeding goal. In this study, aux/indole-3-acetic acid 29 gene in apple (MdIAA29) overexpression lines (#1, #2, and #3) had reduced plant height by 39%, 31%, and 35%, respectively, suitable for close planting applications. Surprisingly, the dwarf MdIAA29-overexpressing lines also showed increased plant tolerance to salt and drought stresses. Further analysis showed that MdIAA29 inhibited the regulation of auxin response factor 4 (ARF4) on Gretchen Hagen 3.9 (GH3.9) gene and 9-cis-epoxycarotenoid dioxygenase 3 (NCED3) gene in apple and changed the contents of auxin and abscisic acid in different tissues, thus achieving a balance between plant height and stress tolerance. In addition, we also found that MdIAA7 enhanced the inhibitory effect of MdIAA29 on MdARF4. In brief, the MdIAA29-MdARF4 complex significantly impacts the height of apple plants and their ability to respond to salt and drought stress.

MdIAA29-MdARF4 复合物在平衡植物高度与盐和干旱胁迫响应方面发挥着重要作用。
培育矮化苹果(Malus domestica)品种是近年来农业的一个趋势,因为这类品种易于维护且产量高;然而,矮化苹果树的抗逆性通常较差。平衡苹果植株高度和抗逆性一直是一个重要的育种目标。在本研究中,苹果中的辅助/吲哚-3-乙酸 29 基因(MdIAA29)过表达株系(1 号、2 号和 3 号)的株高分别降低了 39%、31% 和 35%,适合密植应用。令人惊讶的是,矮化的 MdIAA29 过表达株系对盐和干旱胁迫的耐受性也有所增强。进一步分析表明,MdIAA29抑制了苹果中Gretchen Hagen 3.9(GH3.9)基因上的辅素反应因子4(ARF4)和9-顺式环氧类胡萝卜素二氧酶3(NCED3)基因的调控,改变了不同组织中辅素和脱落酸的含量,从而实现了植株高度和抗逆性之间的平衡。此外,我们还发现 MdIAA7 增强了 MdIAA29 对 MdARF4 的抑制作用。简而言之,MdIAA29-MdARF4 复合物对苹果植株的高度及其应对盐胁迫和干旱胁迫的能力有显著影响。
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来源期刊
Plant Physiology
Plant Physiology 生物-植物科学
CiteScore
12.20
自引率
5.40%
发文量
535
审稿时长
2.3 months
期刊介绍: Plant Physiology® is a distinguished and highly respected journal with a rich history dating back to its establishment in 1926. It stands as a leading international publication in the field of plant biology, covering a comprehensive range of topics from the molecular and structural aspects of plant life to systems biology and ecophysiology. Recognized as the most highly cited journal in plant sciences, Plant Physiology® is a testament to its commitment to excellence and the dissemination of groundbreaking research. As the official publication of the American Society of Plant Biologists, Plant Physiology® upholds rigorous peer-review standards, ensuring that the scientific community receives the highest quality research. The journal releases 12 issues annually, providing a steady stream of new findings and insights to its readership.
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