DMCA
Proliferation
BibTeX
@MISC{Elongation_proliferation,
author = {Gibberellins On Cell Elongation and Jintao Li and Yu Zhao and Huangwei Chu and Likai Wang and Yanru Fu and Ping Liu and Narayana Upadhyaya and Chunli Chen and Tongmin Mou and Yuqi Feng and Prakash Kumar and Jian Xu},
title = {Proliferation},
year = {}
}
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Abstract
Little is known about how the size of meristem cells is regulated and whether it participates in the control of meristem size in plants. Here, we report our findings on shoebox (shb), a mild gibberellin (GA) deficient rice mutant that has a short root meristem size. Quantitative analysis of cortical cell length and number indicates that shb has shorter, rather than fewer, cells in the root meristem until around the fifth day after sowing, from which the number of cortical cells is also reduced. These defects can be either corrected by exogenous applica-tion of bioactive GA or induced in wild-type roots by a dose-dependent inhibitory effect of paclobutrazol on GA biosynthesis, suggesting that GA deficiency is the primary cause of shbmutant phenotypes. SHB encodes an AP2/ERF transcription factor that directly acti-vates transcription of the GA biosynthesis gene KS1. Thus, root meristem size in rice is modulated by SHB-mediated GA biosynthesis that regulates the elongation and prolifera-tion of meristem cells in a developmental stage-specific manner. Author Summary Little is known concerning the identity of regulatory components and signaling pathways
