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The relationship between methyl jasmonate induced anthracnose resistance of tobacco seedlings and phenylalanine ammonia-lyase activity and cell wall substances

Bin Jinhua, Jiang Sheng, Huang Shengqin, Pan Ruichi

Department of Biology,South China Normal University.Guangzhou 510631,Guangdong

Abstract

Three varieties of tobacco (Nicotiana tabacum L.) seedlings at 4-leaf stage were inoculated with spores (10~(8)/ml) of Colletotrichum destructivum O^Gara after or before treatment with methyl jasmonate (Me-Ja). Phenylalanine ammonia-lyase (PAL) activity, hydroxyproline-rich glycoprotein (HRGP) and lignin contents were determined on the following days. Me-Ja treament not only increased the seedlings^ resistance to anthracnose, but also significantly increased their PAL activity, HRGP contents and lignin. The resistance to anthracnose of three tobacco varieties was found to be significantly negatively correlated with the three parameters studied. It is considered that the PAL, lignin and HRGP are involved in the induction of disease resistance by Me-Ja.

Key words: Tobacco seedling;Methyl jasmonate;Induced resistance;PAL;HRGP;Lignin

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Citing This Article：

Bin Jinhua, Jiang Sheng, Huang Shengqin, Pan Ruichi. The relationship between methyl jasmonate induced anthracnose resistance of tobacco seedlings and phenylalanine ammonia-lyase activity and cell wall substances. Acta Physiol Sin 2000; 52 (1): (in Chinese with English abstract).