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First author: Chunbo Miao; Affiliations: CAS Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences (中科院上海植物逆境生物学研究中心): Shanghai, China
Corresponding author: Jian-Kang Zhu
The widespread agricultural problem of pre-harvest sprouting (PHS) could potentially be overcome by improving seed dormancy. Here, we report that miR156, an important grain yield regulator, also controls seed dormancy in rice. We found that mutations in one MIR156 subfamily enhance seed dormancy and suppress PHS with negligible effects on shoot architecture and grain size, whereas mutations in another MIR156 subfamily modify shoot architecture and increase grain size but have minimal effects on seed dormancy. Mechanistically, mir156 mutations enhance seed dormancy by suppressing the gibberellin (GA) pathway through de-represssion of the miR156 target gene Ideal Plant Architecture 1 (IPA1), which directly regulates multiple genes in the GA pathway. These results provide an effective method to suppress PHS without compromising productivity, and will facilitate breeding elite crop varieties with ideal plant architectures.
通过改善种子休眠可以解决农业上一个比较头疼的问题,即种子在收获之间开始萌芽。本文中,作者报道了一个水稻中重要的籽粒产量调控因子miR156同样能够调控种子休眠。作者发现一个MIR156亚家族的突变会导致种子休眠增强,并且能够在不影响水稻株型结构和籽粒大小的情况下抑制种子收获前萌芽的现象,而另外一个MIR156亚家族则会改变水稻的株型结构,增加籽粒大小,但对于种子休眠的影响不大。具体来说,mir156突变体能够解除对于miR156靶基因IPA1的抑制,而IPA1基因能够直接调控多个赤霉素GA通路上的基因,因此mir156突变体能够通过抑制GA通路来增加种子休眠。本文的发现提供了一个不影响产量的情况下抑制水稻种子收获前萌芽的有效办法,这将会促进优良水稻品种的育种进程。
通讯:朱健康(http://sourcedb.sibs.cas.cn/zw/rck/201206/t20120615_3598633.html)
个人简介:1983-1987年,北京农业大学,土壤农业化学学士;1987-1990年,加州大学河滨分校,植物学硕士;1990-1993年,普度大学,植物生理学博士;1994年,洛克菲勒大学,分子生物学博士后。
研究方向:渗透胁迫的感应和信号传导;低温胁迫的感应和信号传导;耐盐和耐氧化的机制;RNA介导的DNA甲基化;DNA去甲基化及其调控。
doi: https://doi.org/10.1038/s41467-019-11830-5
Journal: Nature Communications
Published date: August 23, 2019
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