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Article

OsMDH12: A Peroxisomal Malate Dehydrogenase Regulating Tiller Number and Salt Tolerance in Rice

by
Yuheng Shi
1,2,†,
Jiahui Feng
1,2,†,
Liping Wang
1,2,†,
Yanchen Liu
1,2,
Dujun He
1,2,
Yangyang Sun
1,2,
Yuehua Luo
2,
Cheng Jin
1,2 and
Yuanyuan Zhang
1,2,*
1
School of Breeding and Multiplication (Sanya Institute of Breeding and Multiplication), Hainan University, Sanya 572025, China
2
School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Plants 2023, 12(20), 3558; https://doi.org/10.3390/plants12203558
Submission received: 13 September 2023 / Revised: 4 October 2023 / Accepted: 8 October 2023 / Published: 13 October 2023
(This article belongs to the Special Issue Abiotic Stress Tolerance in Rice and Rice Breeding)
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Abstract

Salinity is an important environmental factor influencing crop growth and yield. Malate dehydrogenase (MDH) catalyses the reversible conversion of oxaloacetate (OAA) to malate. While many MDHs have been identified in various plants, the biochemical function of MDH in rice remains uncharacterised, and its role in growth and salt stress response is largely unexplored. In this study, the biochemical function of OsMDH12 was determined, revealing its involvement in regulating tiller number and salt tolerance in rice. OsMDH12 localises in the peroxisome and is expressed across various organs. In vitro analysis confirmed that OsMDH12 converts OAA to malate. Seedlings of OsMDH12-overexpressing (OE) plants had shorter shoot lengths and lower fresh weights than wild-type (WT) plants, while osmdh12 mutants displayed the opposite. At maturity, OsMDH12-OE plants had fewer tillers than WT, whereas osmdh12 mutants had more, suggesting OsMDH12’s role in tiller number regulation. Moreover, OsMDH12-OE plants were sensitive to salt stress, but osmdh12 mutants showed enhanced salt tolerance. The Na+/K+ content ratio increased in OsMDH12-OE plants and decreased in osmdh12 mutants, suggesting that OsMDH12 might negatively affect salt tolerance through influencing the Na+/K+ balance. These findings hint at OsMDH12’s potential as a genetic tool to enhance rice growth and salt tolerance.
Keywords: rice; malate dehydrogenase; tiller number; salt tolerance rice; malate dehydrogenase; tiller number; salt tolerance

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MDPI and ACS Style

Shi, Y.; Feng, J.; Wang, L.; Liu, Y.; He, D.; Sun, Y.; Luo, Y.; Jin, C.; Zhang, Y. OsMDH12: A Peroxisomal Malate Dehydrogenase Regulating Tiller Number and Salt Tolerance in Rice. Plants 2023, 12, 3558. https://doi.org/10.3390/plants12203558

AMA Style

Shi Y, Feng J, Wang L, Liu Y, He D, Sun Y, Luo Y, Jin C, Zhang Y. OsMDH12: A Peroxisomal Malate Dehydrogenase Regulating Tiller Number and Salt Tolerance in Rice. Plants. 2023; 12(20):3558. https://doi.org/10.3390/plants12203558

Chicago/Turabian Style

Shi, Yuheng, Jiahui Feng, Liping Wang, Yanchen Liu, Dujun He, Yangyang Sun, Yuehua Luo, Cheng Jin, and Yuanyuan Zhang. 2023. "OsMDH12: A Peroxisomal Malate Dehydrogenase Regulating Tiller Number and Salt Tolerance in Rice" Plants 12, no. 20: 3558. https://doi.org/10.3390/plants12203558

APA Style

Shi, Y., Feng, J., Wang, L., Liu, Y., He, D., Sun, Y., Luo, Y., Jin, C., & Zhang, Y. (2023). OsMDH12: A Peroxisomal Malate Dehydrogenase Regulating Tiller Number and Salt Tolerance in Rice. Plants, 12(20), 3558. https://doi.org/10.3390/plants12203558

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