分生组织
细胞分裂素
细胞生物学
拟南芥
木质部
生物
信号转导
血管组织
细胞分化
细胞命运测定
植物
生长素
转录因子
生物化学
基因
开枪
突变体
作者
Ari Pekka Mähönen,Anthony Bishopp,Makie Higuchi,Kaisa Nieminen,Kaori Kinoshita,Kirsi Törmäkangas,Yoshihisa Ikeda,Atsuhiro Oka,Tatsuo Kakimoto,Ykä Helariutta
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2006-01-06
卷期号:311 (5757): 94-98
被引量:518
标识
DOI:10.1126/science.1118875
摘要
The cell lineages that form the transporting tissues (xylem and phloem) and the intervening pluripotent procambial tissue originate from stem cells near the root tip. We demonstrate that in Arabidopsis, cytokinin phytohormones negatively regulate protoxylem specification. AHP6, an inhibitory pseudophosphotransfer protein, counteracts cytokinin signaling, allowing protoxylem formation. Conversely, cytokinin signaling negatively regulates the spatial domain of AHP6 expression. Thus, by controlling the identity of cell lineages, the reciprocal interaction of cytokinin signaling and its spatially specific modulator regulates proliferation and differentiation of cell lineages during vascular development, demonstrating a previously unrecognized regulatory circuit underlying meristem organization.
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