SHORT-ROOT specifically functions in the chalazal region to modulate assimilate partitioning into seeds.

IF 6.2 1区 生物学 Q1 PLANT SCIENCES The Plant Journal Pub Date : 2024-10-30 DOI:10.1111/tpj.17096
Meng Li, Qianfang Li, Shuang Li, Xufang Niu, Huimin Xu, Pengxue Li, Xinxin Bian, Zhichang Chen, Qian Liu, Hongxiang Zhang, Yunqi Liu, Shuang Wu
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Abstract

Nourishing the embryo with endosperm and enclosing both embryo and endosperm in the seed coat are two important evolutionary innovations. Seed coat is conventionally viewed as a protective layer that functions after the seed has matured. Here, we challenge this notion by showing that a subregion of the seed coat, termed the chalazal seed coat (CZSC), is geared to gate seed nutrition loading in developing seeds. The CZSC develops the coordinative system comprising the apoplastic isolation, mediated by the restricted suberization, and the active transport, mediated by the specific expression of a variety of transporters, at as early as the globular embryo stage in both Arabidopsis and soybean seeds. This coordinated system in the CZSC disrupts the vascular continuum to the maternal tissues and forces the nutrient transport into selective and active absorption. We further reveal that the precision of the spatiotemporal suberin deposition and transporter expression is controlled by the regulatory hierarchy of SHR-MYBs cascades. Our results provide a mechanistic insight into the assimilate accumulation in dicot seeds.

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短根(SHORT-ROOT)在卡拉扎尔区域发挥特殊功能,调节种子中同化物的分配。
用胚乳滋养胚和把胚和胚乳都包在种皮中是两个重要的进化创新。种皮通常被视为种子成熟后才发挥作用的保护层。在这里,我们通过证明种皮的一个亚区(称为卡拉扎尔种皮(CZSC))在发育中的种子中起着控制种子营养负荷的作用,对这一观点提出了挑战。早在拟南芥和大豆种子的球胚阶段,CZSC 就形成了一个协调系统,其中包括由受限亚伯化介导的凋落物隔离和由多种转运体的特异性表达介导的主动转运。CZSC 中的这一协调系统破坏了通向母体组织的维管连续性,并迫使养分运输变为有选择的主动吸收。我们进一步揭示出,小檗素沉积和转运体表达的时空精确性受控于 SHR-MYBs 级联的调控层次。我们的研究结果为双子叶植物种子中同化物的积累提供了机理上的启示。
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来源期刊
The Plant Journal
The Plant Journal 生物-植物科学
CiteScore
13.10
自引率
4.20%
发文量
415
审稿时长
2.3 months
期刊介绍: Publishing the best original research papers in all key areas of modern plant biology from the world"s leading laboratories, The Plant Journal provides a dynamic forum for this ever growing international research community. Plant science research is now at the forefront of research in the biological sciences, with breakthroughs in our understanding of fundamental processes in plants matching those in other organisms. The impact of molecular genetics and the availability of model and crop species can be seen in all aspects of plant biology. For publication in The Plant Journal the research must provide a highly significant new contribution to our understanding of plants and be of general interest to the plant science community.
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