Spatial control of potato tuberization by the TCP transcription factor BRANCHED1b
Spatial control of potato tuberization by the TCP transcription factor BRANCHED1b
复制标题
DOI：
10.1038/s41477-022-01112-2
复制
发表时间：
2022-03-01
期刊：
影响因子：
18
通讯作者：
Cubas, Pilar
中科院分区：
文献类型：
--
作者：
Nicolas, Michael;Torres-Perez, Rafael;Cubas, Pilar
在马铃薯中，TCP 转录因子 BRANCHED1b 抑制叶腋中气生块茎的形成。它通过限制胞间连丝的数量、降低蔗糖水平和抑制块茎蛋白 SP6A 发挥作用。碳分配、储存和使用的控制对于植物生长和发育至关重要，可用于作物粮食生产和二氧化碳捕获。马铃薯块茎是以淀粉形式存在的天然碳储备，经过进化可以在冬季繁殖和存活。它们由地下的匍匐茎形成，在那里它们受到保护，免受不利的环境条件和动物觅食的影响。我们发现 BRANCHED1b (BRC1b) 在气生腋芽中充当块茎形成抑制因子，防止芽与匍匐茎竞争库强度。 BRC1b 功能丧失会导致地上块茎的异位产生并减少地下块茎的形成。在气生腋芽中，BRC1b 促进休眠、脱落酸反应和减少胞间连丝数量。这限制了蔗糖的积累和块茎蛋白 SP6A 的获取。 BRC1b 还直接与 SP6A 相互作用并阻断其在地上节中的块茎诱导活性。总而言之，这些行动有助于促进地下块茎化。
In potato, the TCP transcription factor BRANCHED1b represses aerial tuber formation in the axils of the leaves. It functions through limiting the number of plasmodesmata, reducing sucrose levels and repressing the tuberigen protein SP6A.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. 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.