De-Zhou Cui

Shandong Academy of Agricultural Sciences

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Yongbo Li

Northwestern Polytechnical University

Xinxia Sui

National Institute for Communicable Disease Control and Prevention

Xiusheng Chu

Shandong Academy of Agricultural Sciences

Qing-Qi Fan

Shandong Academy of Agricultural Sciences

Chengyan Huang

Zunyi Medical University

Chen Huang

Florida State University

Feng Zhi Guo

Heze Academy of Agricultural Sciences

Mei Yan

Harbin Institute of Technology

Chen Huang

Shanghai University of Traditional Chinese Medicine

Cooperative Institutions

Shandong Academy of Agricultural Sciences

National Engineering Research Center for Wheat

Fudan University

Zunyi Medical University

First People’s Hospital of Zunyi

Crop Research Institute

Northwestern Polytechnical University

China University of Petroleum, East China

Chongqing University

Shanxi Datong University

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Programmed Degradation of Pericarp Cells in Wheat Grains Depends on Autophagy

Frontiers in Genetics (2021)

Yongbo Li Mei Yan De-Zhou Cui Chen Huang Xinxia Sui

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.

ATG8

Wheat grain

Degradation

10.3389/fgene.2021.784545

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Autophagic Survival Precedes Programmed Cell Death in Wheat Seedlings Exposed to Drought Stress

International Journal of Molecular Sciences (2019)

Yongbo Li De-Zhou Cui Xinxia Sui Chen Huang Chengyan Huang

Although studies have shown the concomitant occurrence of autophagic and programmed cell death (PCD) in plants, the relationship between autophagy and PCD and the factors determining this relationship remain unclear. In this study, seedlings of the wheat cultivar Jimai 22 were used to examine the occurrence of autophagy and PCD during polyethylene glycol (PEG)-8000-induced drought stress. Autophagy and PCD occurred sequentially, with autophagy at a relatively early stage and PCD at a much later stage. These findings suggest that the duration of drought stress determines the occurrence of PCD following autophagy. Furthermore, the addition of 3-methyladenine (3-MA, an autophagy inhibitor) and the knockdown of autophagy-related gene 6 (ATG6) accelerated PEG-8000-induced PCD, respectively, suggesting that inhibition of autophagy also results in PCD under drought stress. Overall, these findings confirm that wheat seedlings undergo autophagic survival under mild drought stress, with subsequent PCD only under severe drought.

Drought stress

10.3390/ijms20225777

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Citations (29)