Ornithine δ-aminotransferase is critical for floret development and seed setting through mediating nitrogen reutilization in rice

The Plant Journal : for Cell and Molecular Biology
Changzhen LiuZhukuan Cheng

Abstract

Nitrogen is one of the most important nutrient element that is essential for plant growth and development. Many genes have been reported to contribute to nitrogen absorption and transportation. However, genes involved in nitrogen reutilization are seldom reported. Ornithine δ-aminotransferase (δOAT) is the enzyme connecting arginine cycling and proline cycling. Here, we found that OsOAT, the homologue of δOAT in rice, is essential for nitrogen reutilization through mediating arginase activity. In the Osoat mutant, metabolic abnormality induced by nitrogen deficiency in floret causes malformed glumes, incapable glume opening and anther indehiscence. These defects in the mutant affect the pollination process and lead to a low seed setting rate as well as abnormal seed shape. Intriguingly, urea can rescue the phenotypes of the Osoat mutant. Therefore, OsOAT is crucial for nitrogen reutilization and plays a critical role in floret development and seed setting in rice.

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Citations

Aug 28, 2019·Proceedings of the National Academy of Sciences of the United States of America·Jun FangChengcai Chu
Apr 28, 2021·Plant Science : an International Journal of Experimental Plant Biology·Fiorella Del CastelloNatalia Correa-Aragunde
Aug 5, 2021·Journal of Integrative Plant Biology·Hui LiQuanzi Li

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