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Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (8): 1609-1621.doi: 10.16420/j.issn.0513-353x.2022-0516

• Genetic & Breeding·Germplasm Resources·Molecular Biology •     Next Articles

Cloning,Expression and Promoter Activity Analysis of VlRRA1 Gene in Grape

LI Songqi, LI Xufei, LI Min, LIU Hainan, PEI Maosong, WEI Tonglu, GUO Dalong, YU Yihe*()   

  1. Henan Engineering Technology Research Center of Quality Regulation and Controlling of Horticultural Plants,College of Horticulture and Plant Protection,Henan University of Science and Technology,Luoyang,Henan 471023,China
  • Received:2023-03-24 Revised:2023-04-21 Online:2023-08-25 Published:2023-08-23
  • Contact: YU Yihe

Abstract:

The cytokinin response regulator VlRRA1 and its promoter were cloned from‘Kyoho’grape. The expression characteristics of VlRRA1 and the activity of VlRRA1 promoter were analyzed. The results showed that the full-length cDNA of VlRRA1 was 666 bp and encoded 221 amino acids. Conservative domain analysis showed that the gene contained only one phosphoacceptor receiver domain(REC),which belongs to type-A RR genes and can only accept phosphate groups;phylogenetic relationships showed that VlRRA1 was closely related to type-A RR in other species. The yeast self-activation assay illustrates that VlRRA1 has no transcriptional activation activity in agreement with other A-type RR genes and does not have a function similar to that of the B-type RR transcription factor. The results of qRT-PCR showed that VlRRA1 had tissue-specific expression and was mainly expressed in stems,leaves and young fruit,slightly lower expression in inflorescence and ripe fruit,suggesting that VlRRA1 may play an important role in the process of fruit set;exogenous cytokinin forchlorfenuron(CPPU)can promote VlRRA1 expression,while the cytokinin biosynthesis inhibitor lovastatin(LOV)inhibits VlRRA1 transcription. Many elements related to abiotic stress and hormone response were found in VlRRA1 promoter. The results of GUS tissue staining showed that VlRRA1 promoter had promoter activity and could respond to a variety of hormone signals,including three plant hormones related to fruit setting,cytokinin,auxin and gibberellin. These results suggest that VlRRA1 plays an important role in grape fruit setting and young fruit development mediated by cytokinin.

Key words: grape, cytokinin, cytokinin response regulator, VlRRA1, promoter activity