AUTHOR=Huang Huang , Gao Hua , Liu Bei , Qi Tiancong , Tong Jianhua , Xiao Langtao , Xie Daoxin , Song Susheng 

TITLE=Arabidopsis MYB24 Regulates Jasmonate-Mediated Stamen Development

JOURNAL=Frontiers in Plant Science

VOLUME=8

YEAR=2017

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2017.01525

DOI=10.3389/fpls.2017.01525

ISSN=1664-462X

ABSTRACT=<p>The phytohormone jasmonates (JAs) regulate various defense responses and diverse developmental processes including stamen development and fertility. Previous studies showed that JA induces CORONATINE INSENSITIVE 1-mediated degradation of JA ZIM-domain (JAZ) proteins, and activates the MYB transcription factors (such as MYB21 and MYB24) to regulate stamen development. In this study, we further uncover the mechanism underlying how MYB24 interacts with JAZs to control JA-regulated stamen development. We show that N-terminus of MYB21/24 interacts with 10 out of 12 JAZ proteins while both N-terminus and C-terminus of MYB24 are involved in dimerization of MYB21 and MYB24. Interestingly, male sterility of the JA-deficient mutant <italic>opr3</italic> can be rescued by suitable level of the <italic>MYB24</italic> overexpression but not by excessive high level of <italic>MYB24</italic>. Surprisingly, overexpression of <italic>MYB24NT</italic>, but not <italic>MYB24CT</italic>, could cause male sterility. These results provide new insights on MYB factors in JA-regulated stamen development.</p>