In this study,one DELLA protein-coding gene HbGAI(GenBank accession No.KT696439) was obtained from latex of rubber tree clone ‘CATAS 7-33-97’ by using rapid-amplification of cDNA ends(RACE) and RT-PCR.The full-length cDNA of HbGAI is 2 050 bp with a 1 842 bp open reading frame(ORF),encoding a deduced polypeptide of 613 amino acids with predicted molecular mass of 66.476 kD and theoretical isoelectric point of 5.19.It is deduced that HbGAI is a hydrophilic protein which contains the DELLA and GRAS domain,while without the trans-membrane domain.Phylogenetic analysis indicated that HbGAI was closely related with JcGAI and RcGAI.Real-time PCR analysis showed that HbGAI gene expression in latex was down-regulated significantly by consecutive tapping and methyl jasmonate(MeJA) treatment.However,ethephon(an ethylene releaser) treatment enhanced the expression of HbGAI within 4 hours significantly.The results suggested that HbGAI might play key roles in responses of tapping,jasmonic acid and ethylene in rubber tree.