Welcome to visit Scientia Silvae Sinicae,Today is

Scientia Silvae Sinicae ›› 2013, Vol. 49 ›› Issue (12): 73-80.doi: 10.11707/j.1001-7488.20131211

Previous Articles     Next Articles

Cloning and Expression Analysis of Allene Oxide Cyclase Gene MdAOC1 from Malus domestica

Cao Yanbin1, Bai Suhua2, Dai Hongyi   

  1. 1. College of Horticulture, Qingdao Agricultural University Qingdao 266109;
    2. College of Life Sciences, Qingdao Agricultural University Qingdao 266109
  • Received:2013-04-17 Revised:2013-06-26 Online:2013-12-25 Published:2014-01-01

Abstract:

Allene oxide cyclase (AOC) is a key enzyme in the biosynthesis of jasmonic acid and plays an important role in plant resistance to biostress and abiostress. In the present study, the full length cDNA sequence of an apple (Malus domestica) AOC gene (named as MdAOC1 ) was amplified using in-silico cloning and RACE approaches. The ORF of MdAOC1 gene is 759 bp encoding a protein composed of 252 amino acids. MdAOC1 protein contains a conserved Allene_ox_cyc domain in C-terminus and a chloroplast transit peptide in N-terminus. Multialignment indicated that the MdAOC1 shared high identity with AOC proteins from Oryza sativa and Arabidopsis thaliana. The tertiary structure of the protein formed a hydrophobic binding cavity with two distinct polar patches, which was similar to AtAOC2. Real-time quantitative PCR analysis showed that MdAOC1 expression had tissue specificity and the highest expression was observed in the stems. Moreover, MdAOC1 expression was induced not only by the treatment of wounding, but also by salicylic acid (SA) and methyl jasmonate (MeJA). The results implied that MdAOC1 gene might be involved in the defense responses to biotic or abiotic stress.

Key words: Malus domestica, allene oxide cyclase gene, jasmonate, molecular cloning, gene expression

CLC Number: