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Incidence of anthracnose in relation to chitinase, beta-1,3-glucanase and dopamine of banana fruits after harvest

Juang Yueming

South China Institute of Botany,The Chinese Academy of Sciences.Guangzhou 510650,Guangdong

Abstract

The incidence of anthracnose caused by Colletotrichum musae on banana fruits after harvest was investigated when the fruits were　dipped in a solution of ethrel 1000 mg/L for 1 min and allowed to ripen for 5 d at 20℃ and RH 80%-90% prior to shelf period at ambient　temperature (25-30℃) and RH 55%-65%. The appearance of disease symptoms was related to the physiological condition of the fruits. The activities of chitinase and beta-1,3-glucanase increased gradually during　pathogenesis. However, it decreased a little when the fruits showed　obvious disease symptoms. The treatment with sporgon at a　concentration of 1 mg/L suppressed both the development of anthracnose and　the increases of chitinase and #beta#-1,3-glucanase activities, a　fact suggesting that pathogenesis enhanced the activities of the two　enzymes. The content of dopamine in banana peel was high (1.28 mg/g FW)at harvest, and then decreased markedly during the incidence of　anthracnose. Compared with the variety “63-1”,the activities of　chitinase and #beta#-1,3-glucanase and the content of dopamine were higher　in the variety “Black-oil shape”, which might be associated　with a stronger resistance to the diseases.

Key words: Banana;Anthracnose;Chitinase;#beta#-1;3-glucanase;Dopamine

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Citing This Article：

Juang Yueming. Incidence of anthracnose in relation to chitinase, beta-1,3-glucanase and dopamine of banana fruits after harvest. Acta Physiol Sin 1997; 49 (2): (in Chinese with English abstract).