Plant Molecular Genetics Department, Centro Nacional de Biotecnología-CSIC, Campus Universidad Autónoma de Madrid, Madrid, Spain.
Bioinformatics for Genomics and Proteomics Unit, Centro Nacional de Biotecnología-CSIC, Campus Universidad Autónoma de Madrid, Madrid, Spain.
Nat Plants. 2022 Mar;8(3):281-294. doi: 10.1038/s41477-022-01112-2. Epub 2022 Mar 21.
The control of carbon allocation, storage and usage is critical for plant growth and development and is exploited for both crop food production and CO 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. 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. Altogether, these actions help promote tuberization underground.
控制碳的分配、储存和利用对植物的生长和发育至关重要，这一过程既可以用于作物粮食生产，也可以用于 CO2 捕获。块茎是一种以淀粉形式存在的天然碳库，其进化目的是允许在冬季进行繁殖和生存。块茎由地下匍匐茎形成，在那里它们可以免受不利环境条件和动物觅食的影响。我们发现 BRANCHED1b（BRC1b）在地上腋芽中作为块茎形成的抑制剂，防止芽与匍匐茎争夺库强。BRC1b 功能丧失会导致地上块茎的异位产生和地下块茎形成减少。在地上腋芽中，BRC1b 促进休眠、脱落酸反应和胞间连丝数量减少。这限制了蔗糖的积累和块茎发生蛋白 SP6A 的进入。BRC1b 还可以与 SP6A 直接相互作用，并阻断其在地上节点的诱导块茎活性。总之，这些作用有助于促进地下块茎的形成。
