The biosynthesis of salicylic acid in potato plants

被引:123
作者
Coquoz, JL [1 ]
Buchala, A [1 ]
Métraux, JP [1 ]
机构
[1] Univ Fribourg, Dept Biol, CH-1700 Fribourg, Switzerland
关键词
D O I
10.1104/pp.117.3.1095
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Spraying potato (Solanum tuberosum L.) leaves with arachidonic acid (AA) at 1500 mu g mL(-1) led to a rapid local synthesis of salicylic acid (SA) and accumulation of a SA conjugate, which was shown to be 2-O-beta-glucopyranosylsalicylic acid. Radiolabeling studies with untreated leaves showed that SA was synthesized from phenylalanine and that both cinnamic and benzoic acid were intermediates in the biosynthesis pathway. Using radiolabeled phenylalanine as a precursor, the specific activity of SA was found to be lower when leaves were treated with AA than in control leaves. Similar results were obtained when leaves were fed with the labeled putative intermediates cinnamic acid and benzoic acid. Application of 2-aminoindan-2-phosphonic acid at 40 mu M, an inhibitor of phenyl-alanine ammonia-lyase, prior to treatment with AA inhibited the local accumulation of SA. When the putative intermediates were applied to leaves in the presence of 2-aminoindan-2-phosphonic acid, about 40% of the expected accumulation of free SA was recovered, but the amount of the conjugate remained constant.
引用
收藏
页码:1095 / 1101
页数:7
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