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Journal of Integrative Agriculture  2017, Vol. 16 Issue (07): 1443-1450    DOI: 10.1016/S2095-3119(16)61503-4
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Isolation and expression analysis of NtCHS6, a new chalcone synthase gene from Nicotiana tabacum
CHEN Shuai1, 2, ZHANG Yin-chao2, PAN Xu-hao2, LI Yi-ting2, CUI Li-jie2, WU Feng-yan2, CAO Mo-ju1, YANG Ai-guo2 , PAN Guang-tang1
1 Maize Research Institute, Sichuan Agricultural University, Chengdu 611130, P.R.China
2 Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Qingdao 266101, P.R.China
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Abstract  Chalcone synthases (CHS, EC 2.3.1.74) are key enzymes that catalyze the first committed step in flavonoid biosynthesis. In this study, we isolated a chalcone synthase, named NtCHS6, from Nicotiana tabacum.  This synthase shared high homology with the NSCHSL (Y14507) gene and contained most of the conserved active sites that are in CHS proteins.  The phylogenetic analysis suggested that NtCHS6 protein shared a large genetic distance with other Solanaceae CHS proteins and was the most closely-related to an uncharacterized CHS from Solanum lycopersicum.  The expression analysis indicated
that NtCHS6 was abundantly expressed in leaves, especially in mature leaves.  By scrutinizing its upstream promoter sequences, multiple cis-regulatory elements involved in light and drought responsive were detected.  Furthermore, NtCHS6 expression decreased significantly under dark treatment and increased significantly under drought stress.  Our results suggested that NtCHS6 expression exhibited both light responsiveness and drought responsiveness, and might play important roles in ultraviolet protection and drought tolerance.
Keywords:  chalcone synthase        Nicotiana tabacum        leaf-specific expression        light responsiveness        drought responsiveness  
Received: 26 June 2016   Accepted:
Fund: 

This work was supported by the Agricultural Science and Technology Innovation Program, China (ASTIP-TRIC01).

Corresponding Authors:  Correspondence PAN Guang-tang, Tel: +86-835-2882714, Fax: +86-835-2882121, E-mail: pangt1956@163.com; YANG Ai-guo, Tel: +86-532-66715185, Fax: +86-532-88702236, E-mail: yangaiguo@caas.cn    
About author:  CHEN Shuai, E-mail: chenshuai019@126.com

Cite this article: 

CHEN Shuai, ZHANG Yin-chao, PAN Xu-hao, LI Yi-ting, CUI Li-jie, WU Feng-yan, CAO Mo-ju, YANG Ai-guo , PAN Guang-tang. 2017. Isolation and expression analysis of NtCHS6, a new chalcone synthase gene from Nicotiana tabacum. Journal of Integrative Agriculture, 16(07): 1443-1450.

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