Sakakibara Hitoshi
RIKEN Plant Science Center, Tsurumi, Yokohama 230-0045, Japan.
Annu Rev Plant Biol. 2006;57:431-49. doi: 10.1146/annurev.arplant.57.032905.105231.
Cytokinins (CKs) play a crucial role in various phases of plant growth and development, but the basic molecular mechanisms of their biosynthesis and signal transduction only recently became clear. The progress was achieved by identifying a series of key genes encoding enzymes and proteins controlling critical steps in biosynthesis, translocation, and signaling. Basic schemes for CK homeostasis and root/shoot communication at the whole-plant level can now be devised. This review summarizes recent findings on the relationship between CK structural variation and activity, distinct features in CK biosynthesis between higher plants and Agrobacterium infected plants, CK translocation at whole-plant and cellular levels, and CKs as signaling molecules for nutrient status via root-shoot communication.
细胞分裂素（CKs）在植物生长发育的各个阶段都起着至关重要的作用，但其生物合成和信号转导的基本分子机制直到最近才变得清晰。这一进展是通过鉴定一系列编码控制生物合成、转运和信号传导关键步骤的酶和蛋白质的关键基因而取得的。现在可以设计出全株水平上CK稳态和根/茎通讯的基本方案。本综述总结了关于CK结构变异与活性之间关系、高等植物与农杆菌感染植物在CK生物合成方面的不同特征、全株和细胞水平上的CK转运以及CKs作为通过根-茎通讯传递营养状况信号分子的最新研究结果。
