LF1 regulates the lateral organs polarity development in rice

第一作者：Ting Zhang

第一单位：西南大学

通讯作者：Yunfeng Li

 Abstract 

背景回顾：The patterning of adaxial–abaxial tissues plays a vital role in the morphology of lateral organs, which is maintained by antagonism between the genes that specify adaxial and abaxial tissue identity.

提出问题：The homeo‐domain leucine zipper class III (HD‐IP III) family genes regulate adaxial identity; however, little is known about the physical interactions or transcriptionally regulated downstream genes of HD‐IP III.

主要发现：In this study, we identified a dominant rice mutant, lateral floret 1 (lf1), which has defects in lateral organ polarity.

结果1-LF1基因：LF1 encodes the HD‐IP III transcription factor, which expressed in the adaxial area of lateral organs.

结果2-LF1基因下游：LF1 can activate directly the expression of LITTLE ZIPPER family gene OsZPR4 and HD‐IP II family gene OsHOX1, and OsZPR4 and OsHOX1 respectively interact with LF1 to form a heterodimer to repress the transcriptional activity of LF1.

结果3-LF1与IAA：LF1 influences indole‐3‐acetic acid (IAA) content by directly regulating the expression of OsYUCCA6. Thus, LF1 forms negative feedback loops between OsZPR4 and OsHOX1 to affect IAA content, leading to the regulation of lateral organs polarity development.

结论：These results reveal the cross‐ alk among HD‐IP III, LITTLE ZIPPER, and HD‐IP II proteins, and provide new insights into the molecular mechanisms underlying the polarity development of lateral organs.

doi: https://doi.org/10.1111/nph.17220

Journal: New Phytologist

First Published: Jan 20, 2021