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Acta Horticulturae Sinica ›› 2024, Vol. 51 ›› Issue (1): 91-102.doi: 10.16420/j.issn.0513-353x.2023-0128

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Cloning and Expression Analysis of Mg-Chelatase H Subunit Gene CsChlH in Tea Plant(Camellia sinensis

YE Yufan1,2, WANG Yujie1, FU Qianyuan1,2, WANG Lu1, HAO Xinyuan1, DING Changqing1, WANG Xinchao1, CAO Hongli2,3,**(), LI Nana1,**   

  1. 1 Key Laboratory of Biology,Genetics and Breeding of Special Economic Animals and Plants,Ministry of Agriculture and Rural Affairs,National Center for Tea Improvement,Tea Research Institute,Chinese Academy of Agricultural Sciences,Hangzhou 310008,China
    2 Key Laboratory of Tea Science at Universities in Fujian,College of Horticulture,Fujian Agriculture and Forestry University,Fuzhou 350002,China
    3 College of Food Science,Southwest University,Chongqing 400715,China
  • Received:2023-04-25 Revised:2023-08-28 Online:2024-01-25 Published:2024-01-16
  • Contact: (E-mail:nanali@tricaas.comlili9885@126.com

Abstract:

In this study,the complete open reading frame sequence of CsChlH gene encoded 1 382 amino acid residues was cloned in tea plant(NCBI accession number:ON256194). Phylogenetic tree analysis showed that CsChlH was closely related to AcChlH of kiwifruit. Promoter cloning and sequence analysis showed that CsChlH gene may respond to multiple signals such as light,drought,heat shock,low temperature,ABA,ethylene,and may regulate the metabolism of chlorophylls,flavonoids,sugars,as well as the development of chloroplast,mesophyll,guard cell and other organs. CsChlH protein was localized in the chloroplast. Tissue-specific expression analysis found that CsChlH gene was highly expressed in the chlorophyll-rich source tissues but lowly expressed in the chlorophyll-deficient sink tissues. The expression of CsChlH gene was down-regulated in response to long-term low light conditions,cold and drought stresses,while up-regulated by short-term ABA,ethylene and long-term heat stress. The results revealed that CsChlH gene played a vital role in the regulation of chlorophyll metabolism and stress resistance of tea plant.

Key words: Camellia sinensis, CsChlH, promoter, gene expression, abscisic acid, GUS enzyme activity