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J Exp Bot. 2015 Dec;66(22):7075-87. doi: 10.1093/jxb/erv409. Epub 2015 Aug 28.

HANABA TARANU regulates the shoot apical meristem and leaf development in cucumber (Cucumis sativus L.).

Author information

1
Department of Vegetable Sciences, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, China Agricultural University, Beijing 100193, China.
2
Department of Plant Science and Technology, Beijing University of Agriculture, Beijing, 102206, China.
3
Department of Vegetable Sciences, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, China Agricultural University, Beijing 100193, China zhxiaolan@cau.edu.cn.

Abstract

The shoot apical meristem (SAM) is essential for continuous organogenesis in higher plants, while the leaf is the primary source organ and the leaf shape directly affects the efficiency of photosynthesis. HANABA TARANU (HAN) encodes a GATA3-type transcription factor that functions in floral organ development, SAM organization, and embryo development in Arabidopsis, but is involved in suppressing bract outgrowth and promoting branching in grass species. Here the function of the HAN homologue CsHAN1 was characterized in cucumber, an important vegetable with great agricultural and economic value. CsHAN1 is predominantly expressed at the junction of the SAM and the stem, and can partially rescue the han-2 floral organ phenotype in Arabidopsis. Overexpression and RNAi of CsHAN1 transgenic cucumber resulted in retarded growth early after embryogenesis and produced highly lobed leaves. Further, it was found that CsHAN1 may regulate SAM development through regulating the WUSCHEL (WUS) and SHOOT MERISTEMLESS (STM) pathways, and mediate leaf development through a complicated gene regulatory network in cucumber.

KEYWORDS:

CsHAN; CsSTM; CsWUS; cucumber; leaf development; shoot apical meristem.

PMID:
26320238
PMCID:
PMC4765787
DOI:
10.1093/jxb/erv409
[Indexed for MEDLINE]
Free PMC Article

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