Biotechnology Bulletin ›› 2023, Vol. 39 ›› Issue (5): 192-204.doi: 10.13560/j.cnki.biotech.bull.1985.2022-1196

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Identification and Expression Analysis of PIN Gene Family in Melon Under High Temperature Stress

LI Jing-rui(), WANG Yu-bo, XIE Zi-wei, LI Chang, WU Xiao-lei, GONG Bin-bin, GAO Hong-bo()   

  1. College of Horticulture, Hebei Agricultural University, Key Laboratory of North China Water-saving Irrigation Engineering, Collaborative Innovation Center of Vegetable Industry in Hebei, Hebei Key Laboratory of Vegetable Germplasm Innovation and Utilization, Baoding 071000
  • Received:2022-09-27 Online:2023-05-26 Published:2023-06-08
  • Contact: GAO Hong-bo E-mail:yyljr@hebau.edu.cn;hongbogao@hebau.edu.cn

Abstract:

Auxin efflux carrier protein PIN(PIN-formed)is an important carrier element for regulating polar auxin transport in plants, thus it plays an important role in plant growth and development. However,it is still unclear about the members, properties, chromosomal distribution, phylogeny, promoters of PIN proteins in the genome of melon and expression characteristics of family members under high temperature stress. In the present study, 18 CmPINs members were screened and identified in the whole genome database of Cucumis melo using bioinformatics methods. The number of amino acids encoded by CmPIN family members was 51-642, the molecular weight was 5.19-70.30 kD and the instability index was 24.33-48.87. The results of subcellular localization prediction showed that CmPINs members were mainly distributed in the plasma membrane. There were the transmembrane structures for rest 16 PIN proteins except no transmembrane structure in CmPIN6 and CmPIN8. CmPINs family members were distributed on 9 chromosomes and contained 1-9 Motif. The genes of 18 CmPINs family members contained 1-10 exons and their secondary structure was mainly α-spiral and irregular curly structure. Based on the PIN protein evolutionary tree of CmPIN family members and ArabidopsisArabidopsis thaliana), rice(Oryza sativa), tomato(Solanum lycopersicum), corn(Zea mays), results showed that 18 CmPINs were clustered into 7 subfamilies, with the largest number in subgroup VI. The analysis of cis-acting elements of the promoter revealed that there were a large number of cis-acting basic elements in the melon CmPINs promoters, as well as cis-acting elements related to hormones, light signals and drought induction. Fluorescence quantitative analysis of melon radicles treated with different temperatures showed that the transcriptional expression of CmPIN13 and CmPIN18 genes with Yucasin+IAA treatment were significantly higher than those with Yucasin treatment under high temperature stress; moreover, the transcriptional expressions of CmPIN2, CmPIN13 and CmPIN18 genes with NPA+IAA treatment were significantly higher than those with NPA treatment, which suggested that CmPINs gene family were involved in the tolerance regulation during melon germination under high temperature stress.

Key words: melon, PIN gene family, gene characteristic, bioinformatics, high temperature stress, transcriptional expression