Alpha-picolinic Acid Activates Diverse Defense Responses of Salicylic Acid-, Jasmonic Acid／Ethylene- and Ca^2 -dependent Pathways in Arabidopsis and Rice Suspension Cells  

作　　者：ZHANGHai-Kuo ZHANGXin LIQun HEZu-Hua 

机构地区：[1]NationalLaboratoryofPlantMolecularGenetics,ShanghaiInstituteofPlantPhysiologyandEcology,ShanghaiInstitutesforBiologicalSciences,TheChineseAcademyofSciences,Shanghai200032,China

出　　处：《Acta Botanica Sinica》2004年第10期1200-1205,共6页Acta Botanica Sinica（植物学报：英文版）

摘　　要：Alpha-picolinic acid (PA) is an apoptosis inducer in animal cells, and could elicit hypersensitiv eresponse (HR) in rice, a monocotyledonous model plant. Here we report that PA is an HR inducer in plants. It induced HR in Arabidopsis, a dicotyledonous model plant, including the oxidative burst and cell death. We investigated defense signal transduction activated by PA through marker genes of particular defense pathways in Arabidopsis. The result indicated that both the salicylic acid-dependent and jasmonic acid/ethylene-dependent pathways were activated by PA, in which the marker defense genes PR-1, PR-2 and PDF 1.2 were all induced in dose-dependent and time-course manners. We also observed that the PAinduced reactive oxygen species (ROS) production in rice suspension cells was Ca^2+-dependent. Together with our previous studies of PA-induced defense activation in rice, we conclude that PA acts as a nonspecific elicitor in plant defense and has a potential utilization in cellular model establishment of systemicac quired resistance (SAR) activation.

关 键 词：吡啶羧酸 水杨酸 乙烯 阿布属 钙离子依赖通道 水稻 悬浮细胞 植物 

分 类 号：Q946[生物学—植物学]