On the cover: This is a representative photograph of the Arabidopsis flower and a clock. This image depicts the robust circadian rhythms and specific clock regulatory network of the Arabidopsis’ female reproductive organ, which is arguably one of the more complex and evolutionarily innovative organs of flowering plants. To learn more about how circadian components and transcriptional networks regulate the female reproductive organ, see Okada et al. 2168–2180.
PJ:上海交大发现植物耐受铝胁迫的转录因子
酸性土壤中的铝严重抑制植物的生长发育。作者前期的转录组分析发现了一个受到铝胁迫诱导的R2R3-MYB转录因子MYB741。
研究发现过表达MYB741可以促进根系在铝胁迫条件下的伸长，而其沉默株系则表型相反。分析显示，在MYB741的过表达株系中铝的水平显著下降，而沉默株系则铝的水平显著增高。
分析发现MsMYB741可以通过结合MYB和ABRE顺式作用元件直接激活 phenylalanine ammonia-lyase 1 (MsPAL1)和chalcone isomerase (MsCHI)的表达从而促进了根系中黄酮类化合物的累积，从而促进了黄酮类化合物在铝胁迫条件下从根系中的分泌，进而提高植物对铝胁迫的耐受性。
MYB741受到ABA的诱导，分析显示ABF2可以结合MYB741启动子区的ABRE顺式作用元件，从而激活其表达
本研究揭示的由MYB741介导的植物耐受铝胁迫的分子机制如下：
A simplified model for the role of MsMYB741 in enhancing plant resistance to Al stress.
原文：MsMYB741 is involved in alfalfa resistance to aluminum stress by regulating flavonoid biosynthesis
