Del Rosario Cárdenas-Aquino María, Sarria-Guzmán Yohanna, Martínez-Antonio Agustino
Biological Engineering Laboratory, Cinvestav Irapuato, Km. 9.6 Libramiento Norte Carr. Irapuato-León, Irapuato 36824, Gto, México.
Facultad de Ingeniería y Ciencias Básicas, Fundación Universitaria del Área Andina, Transv 22 Bis #4-105, Valledupar 200005, Cesar, Colombia.
Plant Sci. 2022 Jun;319:111240. doi: 10.1016/j.plantsci.2022.111240. Epub 2022 Mar 5.
Shoot branching is an important event of plant development that defines growth and reproduction. The BRANCHED1 gene (BRC1/TB1/FC1) is crucial for this process. Within the phytohormones, cytokinins directly activate axillary buds to promote shoot branching. In addition, strigolactones and auxins inhibit bud outgrowth. This review addresses the involvement of aromatic and isoprenoid cytokinins in shoot branching. And how auxins and strigolactones contribute to regulating this process also. The results obtained by others and our working group with lemongrass (Cymbopogon citratus) show that cytokinins affect both shoot and root apical meristem development, consistent with other plant species. However, many questions remain about how cytokinins and strigolactones antagonistically regulate BRC1 gene expression. Additionally, many details of the interaction among cytokinins, auxins, and strigolactones need to be clarified. We will gain a more comprehensive scheme of bud outgrowth with these details.
枝条分枝是植物发育中的一个重要事件，它决定着植物的生长和繁殖。BRANCHED1基因（BRC1/TB1/FC1）对这一过程至关重要。在植物激素中，细胞分裂素直接激活腋芽以促进枝条分枝。此外，独脚金内酯和生长素会抑制芽的生长。这篇综述探讨了芳香族和类异戊二烯细胞分裂素在枝条分枝中的作用，以及生长素和独脚金内酯如何对这一过程的调控发挥作用。其他研究人员以及我们研究小组对柠檬草（香茅）的研究结果表明，细胞分裂素会影响地上部和根尖分生组织的发育，这与其他植物物种的情况一致。然而，关于细胞分裂素和独脚金内酯如何拮抗调控BRC1基因的表达，仍存在许多问题。此外，细胞分裂素、生长素和独脚金内酯之间相互作用的许多细节也有待阐明。了解这些细节将有助于我们更全面地理解芽的生长机制。
