Effect of Localized Scorch on the Transport and Distribution of Exogenous Jasmonic Acid in Vicia faba  

局部灼伤对茉莉酸在蚕豆幼苗中运输和分配的影响(英文)

作　　者：刘新[1] 张蜀秋[2] 娄成后[2] 于风义[3] 

机构地区：[1]莱阳农学院基础部,莱阳265200 [2]中国农业大学生物学院,植物生理学与生物化学国家重点实验室,北京100094 [3]中国农业科学院原子能利用研究所,北京100094

出　　处：《Acta Botanica Sinica》2002年第2期164-167,共4页Acta Botanica Sinica（植物学报：英文版）

基　　金：国家重大基础研究和发展规划项目 (G19990 117)~~

摘　　要：Exogenous jasmonic acid (JA) has been showed to be able to induce stomatal closure in Vicia faba L. in previous investigations. The transport and distribution of 3H-JA affected by localized scorch on V. faba seedling were studied with radioisotope technique. The results showed that 3H-JA could be transported up or down at the rate of 4-5 cm·min -1 following feeding into root or shoot tip. The transport of 3H-JA in shoot reached a relative stable rate at 30 min after being fed through root. Wounding by scorch in the youngest leaf caused an increase in the transport of 3H-JA from root to shoot and enhanced the distribution of 3H-JA in the wounded leaf. However, distribution of 3H-JA in unwounded leaves increased after 5 h being fed through the youngest leaf. It was noticed that wounding improved accumulation of 3H-JA in abaxial epidermis. Consistent results were obtained: wounding prevented transport of 3H-JA out from the youngest leaf to root; These observations suggest that JA plays an important role as a defense signal and might be involved in the regulation of the stomatal movement in response to wounding stress.用示踪技术研究了3 H_JA (jasmonicacid)在双子叶植物蚕豆 (ViciafabaL .)中的运输和分配规律以及局部灼伤对其运输与分配的影响。外源3 H_JA能够以高于 4～ 5cm·min-1的速率在蚕豆幼苗体内向上和向下运输。幼叶局部灼伤能提高3 H_JA的向上运输能力 ,促进3 H_JA向受伤部位的调运 ;增加3 H_JA向成熟叶片下表皮的运输分配比率 ;阻止3 H_JA从受伤部位的向外输出。据此推测 ,伤胁迫下JA的运输与分配的改变可能与植物体防御伤反应密切相关 。

关 键 词：jasmonic acid TRANSPORT DISTRIBUTION wounding stress wounding signal Vicia faba 

分 类 号：S643.601[农业科学—蔬菜学]