Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 66, Issue 22, Pages 7075-7087Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erv409
Keywords
CsHAN; CsSTM; CsWUS; cucumber; leaf development; shoot apical meristem
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Funding
- National Basic Research of China 973 program [2012CB113900]
- National Natural Science Foundation of China [31171399]
- Chinese Universities Scientific Fund [2013RC030]
- Earmarked Fund for Beijing Leaf Vegetables Innovation Team of Modern Agro-industry Technology Research System [BLVT-08]
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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.
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