2265 12 archive 2 disk0/00/00/22/65 2008-07-03 06:40:27 2008-07-03 06:40:27 2008-07-03 06:40:27 article show Nik Marzuki Sidik Shirsat, Anil H. Universiti Kebangsaan Malaysia. Faculty of Science and Technology. School of Bioscience and Biotechnology University of Wales, Bangor. School of Biological Sciences pub Q R none Brassica napus, extA, extensin, abscisic acid, methyl jasmonate, salicylic acid We studied the expression of a Brassica napus extensin gene, extA after leaves of the plant were treated with abscisic acid, methyl jasmonate and salicylic acid. All treatments induced the accumulation of two mRNA transcripts of 1.26 and 1.45 kb. The expression was detected as early as after 12 h in methyl jasmonate and salicylic acid treated leaves. Whereas, in abscisic acid treated leaves, the signal was seen after 24 h. The 1.45 kb transcript accumulated at higher level in abscisic acid and salicylic acid treated leaves, while in methyl jasmonate treated leaves the level of both transcripts were almost similar. Interestingly, accumulation of the transcripts in abscisic acid and methyl jasmonate treated leaves follow the same pattern, with the maximum level of expression was seen after 24 h. Induction of extA expression by these compounds has led to the suggestion that extA may play an important role in plant defense system 2005 published Malaysian Journal of Biochemistry and Molecular Biology 11 1 Malaysian Society for Biochemistry and Molecular Biology 1-5 TRUE ISSN 1511-2616 http://ejum.fsktm.um.edu.my/ArticleInformation.aspx?ArticleID=615 1. Carpita NC, Gibeaut DM. Structural models of primary cell walls in flowering plants: consistency of molecular structure with the physical properties of the walls during growth. Plant J 1993; 3: 1-30. 2. Lamport DTA, Epstein L. 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