Biotechnology Bulletin ›› 2020, Vol. 36 ›› Issue (5): 120-129.doi: 10.13560/j.cnki.biotech.bull.1985.2019-0940

Previous Articles     Next Articles

Cloning, Expression Analyses of HbAIH Gene from Hevea brasiliensis

YANG Hong1, YUE Yi-fan1,2, HU Yan-ling1,2, DENG Zhi1, DAI Long-jun1, LI De-jun1   

  1. 1. Rubber Research Institute,Chinese Academy of Tropical Agricultural Sciences,Key Laboratory of Biology and Genetic Resources of Rubber Tree for Ministry of Agriculture and Rural Affairs,State Key Laboratory Incubation Base for Cultivation and Physiology for Tropical Crops,Hainan Provincial Key Laboratory of Tropical Crops Cultivation and Physiology,Haikou 571101;
    2. College of Agriculture,Nanjing Agricultural University,Nanjing 210095
  • Received:2019-10-07 Online:2020-05-26 Published:2020-06-03

Abstract: Agmatine iminohydrolase(AIH)in plant is one of the most important enzymes in the arginine decarboxylase pathway in which arginine is subsequently converted to poluamine. This study is the first time for an AIH gene,HbAIH,to be cloned from Hevea brasiliensis. The full-length sequence of HbAIH was 1 462 bp with a 1 137 bp open reading frame,encoding a sequence with 378 amino acid residues. HbAIH was a hydrophilic protein,with a calculated molecular weight of 42.28 kD and an isoelectric point of 5.09. Sequence alignment revealed that the deduced amino acid sequence of HbAIH presented the high similarity with those of MeAIH in Manihot esculenta,RcAIH in Ricinus communis and JcAIH in Jatropha curcas from Euphorbiaceae,and also contained 11 highly conservative amino acid residues that formed the active sites and participated in the binding with the substrate. qRT-PCR analyses demonstrated that HbAIH expressed with no tissue specificity,the highest in female flowers,followed by barks,stem apexes,latex,leaves and male flowers. HbAIH expression significantly varied in different developmental stages of rubber tree leaves,with the highest expression in light young stage and the lowest one in mature stage,suggesting that HbAIH might be associated with leaf development. In addition,the expression of HbAIH was induced by wounding,low temperature,drought,high salt,hydrogen peroxide,ethrel,MeJA treatments,and tapping panel dryness. All these results suggest that HbAIH is likely involved in growth and development of H. brasiliensis,regulating latex biosynthesis and latex flow,as well as stress responses.

Key words: Hevea brasiliensis, agmatine iminohydrolase, stress responses, expression analysis