Phytoalexin induction and β-1,3-glucanase activities in Colletotrichum trifolii infected leaves of alfalfa (Medicago sativa L.)

被引:16
作者
Salles, II
Blount, JW
Dixon, RA
Schubert, K
机构
[1] Univ Oklahoma, Dept Bot & Microbiol, Dept Bot, Norman, OK 73019 USA
[2] Samuel Roberts Noble Fdn Inc, Div Plant Biol, Ardmore, OK 73402 USA
关键词
beta-1,3-glucanase; phytoalexin; alfalfa (Medicago saliva); Colletotrichum trifolli; eilcitor;
D O I
10.1016/S0885-5765(02)90422-4
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Defence responses were measured in leaves of alfalfa (Medicago saliva L.) after infection by virulent (compatible) and avirulent (incompatible) races of the anthracnose fungus Colletotrichum trifolii. In the incompatible interaction, the isoflavonoid phytoalexin medicarpin and its conjugates started to accumulate 24 and 48 h after inoculation, respectively, whereas their appearance was delayed to 48 and 72 h, respectively, in the compatible interaction. No differences in the activities of beta-1,3-glucanase isoforms were detected between infected and mock-inoculated tissues; expression of these defence-related hydrolases was constitutive. Constitutive overexpression of the alfalfa acidic glucanase Aglu 1 in Regen SY, an alfalfa cultivar susceptible to C. trifolii, did not result in a greater or more rapid phytoalexin response, nor did it reduce the symptoms following pathogen attack, even though the majority of transgenic plants expressing the aglu 1 transgene produced other glucanase isoforms that were not expressed in the non-transformed plants. The results do not support the hypothesis that glucanases may function in host defence to release elicitors of the phytoalexin response in the alfalfa/C. Irifolii interaction. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:89 / 101
页数:13
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