Salicylic acid and salicylic acid glucoside in xylem sap of Brassica napus infected with Verticillium longisporum.
Salicylic acid and salicylic acid glucoside in xylem sap of Brassica napus infected with Verticillium longisporum.
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DOI：
10.1007/s10265-009-0237-5
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发表时间：
2009-09
影响因子：
2.8
通讯作者：
Karlovsky, Petr
中科院分区：
文献类型：
--
作者：
Ratzinger, Astrid;Riediger, Nadine;von Tiedemann, Andreas;Karlovsky, Petr
关键词：
采用HPLC-MS法测定了甘蓝型油菜木质部汁液中的水杨酸（SA）及其糖苷（SAG）。SA和SAG浓度的木质部汁液从根和下胚轴的植物，并在提取物的芽以上的下胚轴，增加感染后的维管病原菌长孢轮枝菌。这两种浓度与疾病的严重程度评估为减少芽长。此外，茎提取物中的SAG水平与下胚轴中长孢弧菌DNA的量相关。虽然浓度的SAG（而不是SA）在木质部汁液中的感染后14至35天逐渐下降，在整个实验期间，SAG水平仍然显着高于未感染的植物。木质部汁液中的茉莉酸（JA）和脱落酸（阿坝）水平不受长孢弧菌感染的影响。SA和SAG扩展了植物激素的清单，可能从根到地上部的蒸腾流。这种运输的生理相关性及其对SA在植物中分布的贡献仍有待阐明。
Salicylic acid (SA) and its glucoside (SAG) were detected in xylem sap of Brassica napus by HPLC–MS. Concentrations of SA and SAG in xylem sap from the root and hypocotyl of the plant, and in extracts of shoots above the hypocotyl, increased after infection with the vascular pathogen Verticillium longisporum. Both concentrations were correlated with disease severity assessed as the reduction in shoot length. Furthermore, SAG levels in shoot extracts were correlated with the amount of V. longisporum DNA in the hypocotyls. Although the concentration of SAG (but not SA) in xylem sap of infected plants gradually declined from 14 to 35 days post infection, SAG levels remained significantly higher than in uninfected plants during the whole experiment. Jasmonic acid (JA) and abscisic acid (ABA) levels in xylem sap were not affected by infection with V. longisporum. SA and SAG extend the list of phytohormones potentially transported from root to shoot with the transpiration stream. The physiological relevance of this transport and its contribution to the distribution of SA in plants remain to be elucidated.
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