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A genome-wide survey of HD-Zip genes in rice and analysis of drought-responsive family members
- Agalou, Adamantia (author)
- Purwantomo, Sigit (author)
-
- Övernäs, Elin (author)
- Uppsala universitet,Fysiologisk botanik
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- Zhu, Xiaoyi (author)
- Estiati, Amy (author)
- de Kam, Rolf J. (author)
- Slamet-Loedin, Inez H. (author)
- Zhu, Zhen (author)
- Wang, Mei (author)
- Xiong, Lizhong (author)
- Meijer, Annemarie H. (author)
- Ouwerkerk, Pieter B. F. (author)
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- (creator_code:org_t)
- 2007-11-13
- 2008
- English.
- In: Plant Molecular Biology. - : Springer Science and Business Media LLC. - 0167-4412 .- 1573-5028. ; 66:1-2, s. 87-103
- Journal article (peer-reviewed)
Abstract
Subject headings
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- The homeodomain leucine zipper (HD-Zip) genes encode transcription factors that have diverse functions in plant development and have often been implicated in stress adaptation. The HD-Zip genes are the most abundant group of homeobox (HB) genes in plants and do not occur in other eukaryotes. This paper describes the complete annotation of the HD-Zip families I, II and III from rice and compares these gene families with Arabidopsis in a phylogeny reconstruction. Orthologous pairs of rice and Arabidopsis HD-Zip genes were predicted based on neighbour joining and maximum parsimony (MP) trees with support of conserved intron-exon organization. Additionally, a number of HD-Zip genes appeared to be unique to rice. Searching of EST and cDNA databases and expression analysis using RT-PCR showed that 30 out of 31 predicted rice HD-Zip genes are expressed. Most HD-Zip genes were broadly expressed in mature plants and seedlings, but others showed more organ specific patterns. Like in Arabidopsis and other dicots, a subset of the rice HD-Zip I and II genes was found to be regulated by drought stress. We identified both drought-induced and drought-repressed HD-Zip genes and demonstrate that these genes are differentially regulated in drought-sensitive versus drought-tolerant rice cultivars. The drought-repressed HD-Zip family I gene, Oshox4, was selected for promoter-GUS analysis, showing that drought-responsiveness of Oshox4 is controlled by the promoter and that Oshox4 expression is predominantly vascular-specific. Loss-of-function analysis of Oshox4 revealed no specific phenotype, but overexpression analysis suggested a role for Oshox4 in elongation and maturation processes.
Subject headings
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Keyword
- homeodomain-leucine zipper
- homeobox
- rice
- Arabidopsis
- drought
- Biology
- Biologi
Publication and Content Type
- ref (subject category)
- art (subject category)
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- de Kam, Rolf J.
- Engström, Peter
- Slamet-Loedin, I ...
- Zhu, Zhen
- Wang, Mei
- Xiong, Lizhong
- Meijer, Annemari ...
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