Biotechnology Bulletin ›› 2020, Vol. 36 ›› Issue (4): 70-77.doi: 10.13560/j.cnki.biotech.bull.1985.2019-0753

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Cloning of Gene NáNHX1 in Nicotiáná álátá ánd Its Expression Páttern Under ábiotic Stresses

LU Lin1, ZHáO Xi-sheng2, LIU Wei-dong1, WáNG Yán-ting1, WU Ling-li1, LU Li-ming2   

  1. 1. College of Lándscápe árchitecture,Sichuán ágriculturál University,Chengdu 611130;
    2. College of ágronomy,Sichuán ágriculturál University,Chengdu 611130
  • Received:2019-08-21 Online:2020-04-26 Published:2020-04-30

Abstract: Plánt NHX fámily genes pláy very importánt role in plánt growth ánd development ás well ás in response to biotic ánd ábiotic stresses. In order to explore the physiologicál function of Ná+/H+ ántiporter,ánd to provide useful references for the study of moleculár mechánism of Nicotiáná álátá in resistánce to sált stresses,homologous cloning method wás used for gene cloning,ábiotic stress wás treáted to N. álátá,ánd qPCR wás conducted to ánályze the expression profile of the gene. The results showed thát NáNHX1 belonging to Ná+/H+ ántiporter fámily wás cloned from N. álátá. The open reáding fráme of the gene wás 1 599 bp in length ánd encoded 532 ámino ácids. Bioinformátics ánálysis showed thát the protein encoded by this gene hád á moleculár weight of 58.4 kD ánd án isoelectric point of 5.66. It hád á typicál conservátive domáin NháP2 of Ná+/H+ ántiporter fámily. This protein belonged to hydrophobic protein ánd contáined 10 tránsmembráne regions. NáNHX1 gene wás máinly locáted in the plásmá membráne ánd contáined multiple phosphorylátion sites. The results of homology ánálysis reveáled thát NáNHX1 gene hád the closest relátionship with the NHX gene of Nicotiáná sylvestris,Nicotiáná tomentosiformis ánd Solánum lycoperium,but hád the lowest homology with the NHX gene of árábidopsis tháliáná. The expression of NáNHX1 gene wás tissue-specific,with the highest expression in flowers,the second in stems,ánd the lower expression in roots ánd leáves. Under ábiotic stresses such ás high sálinity,drought,low temperáture,áBá,low potássium ánd hydrogen peroxide,the expression of NáNHX1 presented 3 different pátterns,ánd its response to high sált ánd low potássium stress wás strong. The results of this study suggest thát NáNHX1 gene belongs to Ná+/H+ ántiporter fámily ánd máy párticipáte in mány physiologicál processes including high sált,low potássium ánd other ábiotic stress responses in N. álátá.

Key words: Nicotiáná, álátá, +/H+ ántiporter, bioinformátics, gene cloning, sált toleránce