The Potential Role of Auxin and Abscisic Acid Balance and FtARF2 in the Final Size Determination of Tartary Buckwheat Fruit

International Journal of Molecular Sciences

Gang Zhao¹  Qi Wu²  Wenjun Sun²  Moyang Liu²  Li Huang²  Junyi Zhan²  Jing Wang²  Hui Chen²  Yanjun Zhang²  Weiqiong Jin²  Yuntao Cai²  Zhaotang Ma²  Tongliang Bu²  Yujia Tang²  Zizhong Tang²  Tianrun Zheng²  Chenglei Li² 

[1] College of Biological Industry, Chengdu University, Chengdu 610101, China;College of Life Science, Sichuan Agricultural University, Ya’an 625014, China;

关键词: Fagopyrum tataricum Gaertn.;    abscisic acid;    auxin;    cell division;    embryogenesis;    polygonaceae;    fruit size;    ARF2;    SAURs;   

DOI  :  10.3390/ijms19092755

来源: DOAJ

【 摘 要 】

Tartary buckwheat is a type of cultivated medicinal and edible crop with good economic and nutritional value. Knowledge of the final fruit size of buckwheat is critical to its yield increase. In this study, the fruit development of two species of Tartary buckwheat in the Polygonaceae was analyzed. During fruit development, the size/weight, the contents of auxin (AUX)/abscisic acid (ABA), the number of cells, and the changes of embryo were measured and observed; and the two fruit materials were compared to determine the related mechanisms that affected fruit size and the potential factors that regulated the final fruit size. The early events during embryogenesis greatly influenced the final fruit size, and the difference in fruit growth was primarily due to the difference in the number of cells, implicating the effect of cell division rate. Based on our observations and recent reports, the balance of AUX and ABA might be the key factor that regulated the cell division rate. They induced the response of auxin response factor 2 (FtARF2) and downstream small auxin upstream RNA (FtSAURs) through hormone signaling pathway to regulate the fruit size of Tartary buckwheat. Further, through the induction of fruit expansion by exogenous auxin, FtARF2b was significantly downregulated. The FtARF2b is a potential target for molecular breeding or gene editing.

【 授权许可】

Unknown