首页 | 本学科首页   官方微博 | 高级检索  
   检索      


An abietane diterpenoid is a potent activator of systemic acquired resistance
Authors:Chaturvedi Ratnesh  Venables Barney  Petros Robby A  Nalam Vamsi  Li Maoyin  Wang Xuemin  Takemoto Larry J  Shah Jyoti
Institution:Department of Biological Sciences, University of North Texas, Denton, TX 76203, USA.
Abstract:Abietane diterpenoids are major constituents of conifer resins that have important industrial and medicinal applications. However, their function in plants is poorly understood. Here we show that dehydroabietinal (DA), an abietane diterpenoid, is an activator of systemic acquired resistance (SAR), which is an inducible defense mechanism that is activated in the distal, non-colonized, organs of a plant that has experienced a local foliar infection. DA was purified as a SAR-activating factor from vascular sap of Arabidopsis thaliana leaves treated with a SAR-inducing microbe. Locally applied DA is translocated through the plant and systemically induces the accumulation of salicylic acid (SA), an important activator of defense, thus leading to enhanced resistance against subsequent infections. The NPR1 (NON-EXPRESSOR OF PR GENES1), FMO1 (FLAVIN-DEPENDENT MONOOXYGENASE1) and DIR1 (DEFECTIVE IN INDUCED RESISTANCE1) genes, which are critical for biologically induced SAR, are also required for the DA-induced SAR, which is further enhanced by azelaic acid, a defense priming molecule. In response to the biological induction of SAR, DA in vascular sap is redistributed into a SAR-inducing 'signaling DA' pool that is associated with a trypsin-sensitive high molecular weight fraction, a finding that suggests that DA-orchestrated SAR involves a vascular sap protein(s).
Keywords:long‐distance communication  dehydroabietinal  plant stress response  systemic immunity  Arabidopsis thaliana  immunity booster
本文献已被 PubMed 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号