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    2019, Vol. 18 Issue (02): 361-371     DOI: 10.1016/S2095-3119(18)61914-8
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Up-regulation of a homeodomain-leucine zipper gene HD-1 contributes to trichome initiation and development in cotton
NIU Er-li, CAI Cai-ping, BAO Jiang-hao, WU Shuang, ZHAO Liang, GUO Wang-zhen
State Key Laboratory of Crop Genetics & Germplasm Enhancement, Ministry of Science and Technology/Hybrid Cotton R&D Engineering Research Center, Ministry of Education/College of Agriculture, Nanjing Agricultural University, Nanjing 210095, P.R.China
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Abstract 
Plant trichomes originate from epidermal cells.  In this work, we demonstrated that a homeodomain-leucine zipper (HD-Zip) gene, Gh_A06G1283 (GhHD-1A), was related to the leaf trichome trait in allotetraploid cotton and could be a candidate gene for the T1 locus.  The ortholog of GhHD-1A  in the hairless accession Gossypium barbadense cv. Hai7124 was interrupted by a long terminal repeat (LTR) retrotransposon, while GhHD-1A worked well in the hairy accession Gossypium hirsutum acc. T586.  Sequence and phylogenetic analysis showed that GhHD-1A  belonged to the HD-Zip IV gene family, which mainly regulated epidermis hair development in plants.  Silencing of GhHD-1A  and its homoeologs GhHD-1D in allotetraploid T586 and Hai7124 could significantly reduce the density of leaf hairs and affect the expression levels of other genes related to leaf trichome formation.  Further analysis found that GhHD-1A  mainly regulated trichome initiation on the upper epidermal hairs of leaves in cotton, while the up-regulated expression of GhHD-1A  in different organs/tissues also altered epidermal trichome development.  This study not only helps to unravel the important roles of GhHD-1A  in regulating trichome initiation in cotton, but also provides a reference for exploring the different forms of trichome development in plants.
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Articles by authors
NIU Er-li
CAI Cai-ping
BAO Jiang-hao
WU Shuang
ZHAO Liang
GUO Wang-zhen
Key wordsleaf trichome     map-based cloning    a homeodomain-leucine zipper gene HD-1     virus-induced gene silencing (VIGS)     functional differentiation     
Received: 2017-12-21; Accepted: 2018-01-11
Fund: This work was supported by the National Natural Science Foundation of China (31471539) and the Jiangsu Collaborative Innovation Center for Modern Crop Production Project, China (No.10).
Corresponding Authors: Correspondence GUO Wang-zhen, Tel: +86-25-84396523, E-mail: moelab@njau.edu.cn   
About author: NIU Er-li, E-mail: niuerli@zaas.ac.cn;
Cite this article:   
NIU Er-li, CAI Cai-ping, BAO Jiang-hao, WU Shuang, ZHAO Liang, GUO Wang-zhen. 2019. Up-regulation of a homeodomain-leucine zipper gene HD-1 contributes to trichome initiation and development in cotton. Journal of Integrative Agriculture, 18(02): 361-371.
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http://www.chinaagrisci.com/Jwk_zgnykxen/EN/ 10.1016/S2095-3119(18)61914-8      or     http://www.chinaagrisci.com/Jwk_zgnykxen/EN/Y2019/V18/I02/361
 
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