The Arabidopsis ORGAN SIZE RELATED 2is involved in regulation of cell expansion during organ growth

BMC Plant Biology

Research Article

Guanping Feng¹  Zhixiang Qin²  Xiaoran Zhang²  Yuxin Hu³  Xiao Zhang⁴ 

[1] Key Laboratory for Biodiversity Science and Ecological Engineering, School of Life Sciences, Jinggangshan University, 343009, Ji’an, Jiangxi;Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, 100093, Beijing, China;Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, 100093, Beijing, China;National Center for Plant Gene Research, Beijing, China;Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, 100093, Beijing, China;University of Chinese Academy of Sciences, Beijing, China;

关键词: Arabidopsis;    Cell expansion;    Cell proliferation;    OSR;    Organ size;   

DOI  :  10.1186/s12870-014-0349-5

 received in 2014-07-25, accepted in 2014-11-25,  发布年份 2014

来源: Springer

【 摘 要 】

BackgroundIn plants, the growth of an aerial organ to its characteristic size relies on the coordination of cell proliferation and expansion. These two different processes occur successively during organ development, with a period of overlap. However, the mechanism underlying the cooperative and coordinative regulation of cell proliferation and expansion during organ growth remains poorly understood.ResultsThis study characterized a new Arabidopsis ORGAN SIZE RELATED (OSR) gene, OSR2, which participates in the regulation of cell expansion process during organ growth. OSR2 was expressed primarily in tissues or organs undergoing growth by cell expansion, and the ectopic expression of OSR2 resulted in enlarged organs, primarily through enhancement of cell expansion. We further show that OSR2 functions redundantly with ARGOS-LIKE (ARL), another OSR gene that regulates cell expansion in organ growth. Moreover, morphological and cytological analysis of triple and quadruple osr mutants verified that the four OSR members differentially but cooperatively participate in the regulation of cell proliferation and cell expansion and thus the final organ size.ConclusionsOur results reveal that OSR2 is functional in the regulation of cell expansion during organ growth, which further implicates the involvement of OSR members in the regulation of both cell proliferation and expansion and thus the final organ size. These findings, together with our previous studies, strongly suggest that OSR-mediated organ growth may represent an evolutionary mechanism for the cooperative regulation of cell proliferation and expansion during plant organogenesis.

【 授权许可】

Unknown   
© Qin et al.; licensee BioMed Central Ltd. 2014. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.