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PbNAC3协调AsA生成和ABA生物合成,以改善梨的盐耐受性

Feng Zhang¹, Yanyan Gao¹, Mingyuan Ma¹

¹College of Horticulture, State Key Laboratory of Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, 210095, China.

The Plant journal : for cell and molecular biology

|April 23, 2025

概括

在植物盐应激反应中,脱酸盐减少酶 (DHAR) 的新型分子机制涉及硫化以促进酸盐 (AsA) 生成. 转录因子PbNAC3通过调节DHAR和ABA生物合成途径来增强盐分耐受性.

科学领域:

植物生物学植物生物学
分子生物学分子生物学
生物化学生物化学

背景情况:

脱酸缩酶 (DHAR) 对于通过植物的AsA-GSH循环维持酸 (AsA) 水平至关重要.
对于DHAR对盐应激反应的分子机制在很大程度上仍未被描述.

研究的目的:

为了阐明DHAR在应对盐应激时的分子机制.
研究转录因子PbNAC3在植物盐分耐受性中的作用.

主要方法:

酶动力学测试以确定DHAR机制.
在梨和阿拉比多普西斯的基因过度表达和沉默.
促进体结合测定和基因表达分析 (PbNAC3,PbDHAR3,PbNCED5).
测量酸盐 (AsA),酸 (ABA) 含量和生理压力指标.

主要成果:

在AsA生成中确定了DHAR的乒乓球机制,对H2O2介导的抑制敏感.
过度表达PbDHAR3增强了盐耐受性,而沉默降低了它.
通过向PbNCED5.5,PbNAC3直接激活PbDHAR3的表达,并间接增强ABA生物合成.
过度表达PbNAC3改善了盐分耐受性,并调节了植物生长压力耐受性权衡.

结论:

PbNAC3是植物盐应激反应的关键调节者,促进AsA生成和ABA生物合成.
了解PbNAC3-DHAR-ABA通路,可以深入了解植物应激耐受机制.
这项研究有助于开发耐盐,高产的作物品种.

关键词:

这就是PbDHAR3的原因.在PbNAC3中,PbNAC3是在PbNCED5中使用.盐的压力是盐的压力.硫化硫化

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