MdMYB73 对液泡质子泵 P-ATP 酶 MdPH5 的调控及其在苹果酸积累和液泡酸化中的作用

IF 4.6 4区 农林科学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Xiao-Yu Huang, Ying Xiang, Yu-Wen Zhao, Chu-Kun Wang, Jia-Hui Wang, Wen-Yan Wang, Xiao-Long Liu, Quan Sun, Da-Gang Hu
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引用次数: 0

摘要

作为水果中的主要有机酸,苹果酸在细胞质中产生,然后被运输到液泡中。它通过液泡质子泵、转运体和通道积聚,影响水果的口感和风味。在三种质子泵(V-ATP 酶、V-PP 酶和 P-ATP 酶)中,P-ATP 酶在将苹果酸盐转运到液泡中起着重要作用。本研究分析了开花后和贮藏期间不同阶段收集的转录组数据,结果表明液泡质子泵 P-ATP 酶 MdPH5 的表达与收获前后苹果酸含量有关。此外,MdPH5 定位于营养体,调节苹果酸的积累和液泡 pH 值。此外,MdPH5 的上游 MYB 转录因子 MdMYB73 可直接与其启动子结合,从而转录激活其表达并增强其活性。这样,MdMYB73 也能影响苹果酸的积累和液泡 pH 值。总之,本研究阐明了 MdMYB73 和 MdPH5 如何调控液泡苹果酸盐转运系统,从而影响苹果酸盐积累和液泡 pH 值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Regulation of a vacuolar proton-pumping P-ATPase MdPH5 by MdMYB73 and its role in malate accumulation and vacuolar acidification

As the main organic acid in fruits, malate is produced in the cytoplasm and is then transported into the vacuole. It accumulates by vacuolar proton pumps, transporters, and channels, affecting the taste and flavor of fruits. Among the three types of proton pumps (V-ATPases, V-PPases, and P-ATPases), the P-ATPases play an important role in the transport of malate into vacuoles. In this study, the transcriptome data, collected at different stages after blooming and during storage, were analyzed and the results demonstrated that the expression of MdPH5, a vacuolar proton-pumping P-ATPase, was associated with both pre- and post-harvest malate contents. Moreover, MdPH5 is localized at the tonoplast and regulates malate accumulation and vacuolar pH. In addition, MdMYB73, an upstream MYB transcription factor of MdPH5, directly binds to its promoter, thereby transcriptionally activating its expression and enhancing its activity. In this way, MdMYB73 can also affect malate accumulation and vacuolar pH. Overall, this study clarifies how MdMYB73 and MdPH5 act to regulate vacuolar malate transport systems, thereby affecting malate accumulation and vacuolar pH.

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来源期刊
CiteScore
7.70
自引率
2.80%
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