期刊
FRONTIERS IN GENETICS
卷 12, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fgene.2021.784545
关键词
wheat; pericarp; autophagy; programmed cell death; autophagy-related genes
资金
- National Natural Science Foundation of China [32001542]
- Shandong Natural Science Foundation [ZR2020QC114]
- Open Project of State Key Laboratory for Wheat and Maize Engineering [2018LYZWS06]
- Innovation Project of Shandong Academy of Agricultural Sciences Key Techniques of Crop Breeding [CXGC 2021A09]
The study found that the thickness of the pericarp in developing wheat grains increases from top to bottom, corresponding to a decrease in the number of cell layers. Autophagy-related genes play a crucial role in programmed cell death in the pericarp during grain development.
Wheat is one of the most important food crops in the world, with development of the grains directly determining yield and quality. Understanding grain development and the underlying regulatory mechanisms is therefore essential in improving the yield and quality of wheat. In this study, the developmental characteristics of the pericarp was examined in developing wheat grains of the new variety Jimai 70. As a result, pericarp thickness was found to be thinnest in grains at the top of the spike, followed by those in the middle and thickest at the bottom. Moreover, this difference corresponded to the number of cell layers in the pericarp, which decreased as a result of programmed cell death (PCD). A number of autophagy-related genes (ATGs) are involved in the process of PCD in the pericarp, and in this study, an increase in ATG8-PE expression was observed followed by the appearance of autophagy structures. Meanwhile, following interference of the key autophagy gene ATG8, PCD was inhibited and the thickness of the pericarp increased, resulting in small premature grains. These findings suggest that autophagy and PCD coexist in the pericarp during early development of wheat grains, with both processes increasing from the bottom to the top of the spike. Moreover, PCD was also found to rely on ATG8-mediated autophagy. The results of this study therefore provide a theoretical basis for in-depth studies of the regulatory mechanisms of wheat grain development.
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