4.2 Article

Overexpression of OsAP2 and OsWRKY24 in Arabidopsis results in reduction of plant size

期刊

PLANT BIOTECHNOLOGY
卷 35, 期 3, 页码 273-279

出版社

JAPANESE SOC PLANT CELL & MOLECULAR BIOLOGY
DOI: 10.5511/plantbiotechnology.18.0508a

关键词

APETALA2 transcription factor; cell size; RNA expression; transgenic Arabidopsis; WRKY transcription factor

资金

  1. MOST, Taiwan [106-2313-B-001-005]
  2. BCST of ABRC, Academia Sinica

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Recently, two rice genes, OsAPETALA2 (OsAP2) and OsWRKY24 have been reported to be positive regulators involved in increased lamina inclination and grain size through cell elongation. Here, we found that the two genes have tightly linked expression patterns and functional convergence in rice, and are also likely to play an opposite role in Arabidopsis. Overexpression of the two rice transcription factors in Arabidopsis caused smaller plant size with reduced cell size, and the expression of a series of genes encoding expansins and xyloglucan endotransglucosylase/hydrolases (XTHs) involved in cell elongation was reduced. However, transgenic Arabidopsis expressing OsWRKY24-SRDX as a synthetic chimeric repressor displayed indistinguishable phenotypes from wild-type plants. Moreover, the subcellular localization pattern of OsWRKY24 in Arabidopsis was different from that in rice. Thus, we demonstrate an example of transcription factors from one species playing distinct roles in different plant species.

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