Spatial control of potato tuberization by the TCP transcription factor BRANCHED1b

通讯单位：西班牙马德里自治大学

通讯作者：Pilar Cubas

The control of carbon allocation, storage and usage is critical for plant growth and development and is exploited for both crop food production and CO2 capture. Potato tubers are natural carbon reserves in the form of starch that have evolved to allow propagation and survival over winter. They form from stolons, below ground, where they are protected from adverse environmental conditions and animal foraging. 

控制碳分布、贮藏和利用对植物生长和发育至关重要，并用于作物粮食生产和CO2捕获。马铃薯块茎是以淀粉形式存在的天然碳储备，经转化后可以繁殖和过冬。他们从地下的匍匐茎形成，在那里它们受到保护，不受恶劣环境条件和动物觅食影响。

We show that BRANCHED1b (BRC1b) acts as a tuberization repressor in aerial axillary buds, which prevents buds from competing in sink strength with stolons. BRC1b loss of function leads to ectopic production of aerial tubers and reduced underground tuberization. In aerial axillary buds, BRC1b promotes dormancy, abscisic acid responses and a reduced number of plasmodesmata. This limits sucrose accumulation and access of the tuberigen protein SP6A. BRC1b also directly interacts with SP6A and blocks its tuber-inducing activity in aerial nodes. 

该研究发现了BRC1b在地上部的腋芽分生扮演了抑制因子角色，它阻止了芽在库强度上与匍匐茎竞争。BRC1b功能缺失导致地上部块根易位生产地下部块根减少。在地上部腋芽中，BRC1b促进休眠、ABA反应减少胞间连丝的数量。这限制了蔗糖的积累和SP6A蛋白获取。BRC1b也直接与SP6A互作，阻止地上部节上块根诱导活力。

Altogether, these actions help promote tuberization underground.

综上，这些过程有利于促进地下块茎形成。

原文链接：https://www.nature.com/articles/s41477-022-01112-2

Journal:Nature Plants， 

Published data: 21 March 2022