Dehydrocostus lactone is exuded from sunflower roots and stimulates germination of the root parasite Orobanche cumana
Dehydrocostus lactone is exuded from sunflower roots and stimulates germination of the root parasite Orobanche cumana
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DOI：
10.1016/j.phytochem.2011.01.037
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发表时间：
2011-05-01
期刊：
影响因子：
3.8
通讯作者：
Steffens, John C.
中科院分区：
文献类型：
--
作者：
Joel, Daniel M.;Chaudhuri, Swapan K.;Steffens, John C.
列当科专性根寄生虫的萌发依赖于对来自寄主根的化学刺激的感知。几种化合物，统称为独脚金内酯，刺激各种列当物种的萌发，但不显着引起列当库马纳，向日葵的一种特殊寄生虫的萌发。库马纳，和fluridone -类胡萝卜素生物合成途径的抑制剂-并没有抑制生产的萌芽刺激剂在芽和根的年轻的向日葵plants，表明刺激剂不是独脚金内酯。我们确定了天然的萌芽刺激剂从向日葵根分泌物的生物测定驱动的纯化。其化学结构经鉴定为愈创木倍半萜内酯脱氢木香内酯（DCL）。低浓度的DCL能有效地促进O.库马纳种子，但不是埃及蒲葵（syn.埃及列当（Orobanche aegyptiaca）。DCL和其他倍半萜内酯在各种植物器官中被发现，但以前不知道被渗出到根际，在那里它们可以与其他生物体相互作用。(C)2011爱思唯尔有限公司保留所有权利。
The germination of the obligate root parasites of the Orobanchaceae depends on the perception of chemical stimuli from host roots. Several compounds, collectively termed strigolactones, stimulate the germination of the various Orobanche species, but do not significantly elicit germination of Orobanche cumana, a specific parasite of sunflower.Phosphate starvation markedly decreased the stimulatory activity of sunflower root exudates toward O. cumana, and fluridone - an inhibitor of the carotenoid biosynthesis pathway - did not inhibit the production of the germination stimulant in both shoots and roots of young sunflower plants, indicating that the stimulant is not a strigolactone.We identified the natural germination stimulant from sunflower root exudates by bioassay-driven purification. Its chemical structure was elucidated as the guaianolide sesquiterpene lactone dehydrocostus lactone (DCL). Low DCL concentrations effectively stimulate the germination of O. cumana seeds but not of Phelipanche aegyptiaca (syn. Orobanche aegyptiaca). DCL and other sesquiterpene lactones were found in various plant organs, but were previously not known to be exuded to the rhizosphere where they can interact with other organisms. (C) 2011 Elsevier Ltd. All rights reserved.