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Article|25 Oct 2021|OPEN
Mechanisms and regulation of organic acid accumulation in plant vacuoles
Xiao-Yu Huang1, Chu-Kun Wan1, Yu-Wen Zhao1, Cui-Hui Sun1, & Da-Gang Hu1,
1National Key Laboratory of Crop Biology; Shandong Collaborative Innovation Center of Fruit & Vegetable Quality and Efficient Production; College of Horticulture Science and Engineering, Shandong Agricultural University, Tai’an, Shandong 271018, China

Horticulture Research 8,
Article number: 227 (2021)
doi: 10.1038/hortres.2021.227
Views: 187

Received: 30 Jun 2021
Revised: 09 Sep 2021
Accepted: 24 Sep 2021
Published online: 25 Oct 2021

Abstract

In fleshy fruits, organic acids are the main source of fruit acidity and play an important role in regulating osmotic pressure, pH homeostasis, stress resistance, and fruit quality. The transport of organic acids from the cytosol to the vacuole and their storage are complex processes. A large number of transporters carry organic acids from the cytosol to the vacuole with the assistance of various proton pumps and enzymes. However, much remains to be explored regarding the vacuolar transport mechanism of organic acids as well as the substances involved and their association. In this review, recent advances in the vacuolar transport mechanism of organic acids in plants are summarized from the perspectives of transporters, channels, proton pumps, and upstream regulators to better understand the complex regulatory networks involved in fruit acid formation.