Regulation of plant growth by cytokinin

被引:802
作者
Werner, T
Motyka, V
Strnad, M
Schmülling, T
机构
[1] Univ Tubingen, Ctr Plant Mol Biol ZMBP Allgemeine Genet, D-72076 Tubingen, Germany
[2] Acad Sci Czech Republ, Inst Expt Bot, CZ-16502 Prague 6, Czech Republic
[3] Palacky Univ, CZ-78731 Olomouc, Czech Republic
[4] ACSR, Inst Expt Bot, Dept Bot, Lab Growth Regulators, CZ-78731 Olomouc, Czech Republic
关键词
D O I
10.1073/pnas.171304098
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Cytokinins are a class of plant-specific hormones that play a central role during the cell cycle and influence numerous developmental programs. Because of the lack of biosynthetic and signaling mutants, the regulatory roles of cytokinins are not well understood. We genetically engineered cytokinin oxidase expression in transgenic tobacco plants to reduce their endogenous cytokinin content. Cytokinin-deficient plants developed stunted shoots with smaller apical meristems. The plastochrone was prolonged, and leaf cell production was only 3-4% that of wild type, indicating an absolute requirement of cytokinins for leaf growth. In contrast, root meristems of transgenic plants were enlarged and gave rise to faster growing and more branched roots. These results suggest that cytokinins are an important regulatory factor of plant meristem activity and morphogenesis, with opposing roles in shoots and roots.
引用
收藏
页码:10487 / 10492
页数:6
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