Effect of humidity and temperature on conidial germination and appressorium development of two Philippine isolates of the mango anthracnose pathogen Colletotrichum gloeosporioides

Estrada, A.B. and Dodd, J.C. and Jeffries, P. (2000) Effect of humidity and temperature on conidial germination and appressorium development of two Philippine isolates of the mango anthracnose pathogen Colletotrichum gloeosporioides. Plant Pathology, 49 (5). pp. 608-618. ISSN 0032-0862. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1046/j.1365-3059.2000.00492.x

Abstract

A comparison of rates of germination and appressorium formation by an isolate of Colletotrichum gloeosporioides on mango leaves, fruit surfaces and cellophane membranes showed that behaviour was broadly similar on all three substrates. Frequency of appressorium formation was slightly higher on cellophane membranes, and both hyaline and melanized appressoria were formed. Only melanized appressoria were formed on mango surfaces. In vitro experiments on membranes showed comparative differences in physiological behaviour with temperature for two Philippine isolates of C. gloeosporioides. The most stimulatory temperature for production of appressoria differed in isolates I-2 and I-4 (25 and 20 degrees C, respectively). At 30 degrees C more appressoria became melanized than at lower temperatures, but the frequency of formation of penetration pegs was highest at 25 degrees C. Conidia of C. gloeosporioides germinated on cellophane membranes at relative humidities as low as 95%, but the percentage of conidia germinating and forming appressoria increased as the RH approached 100%. Approximately 18% of conidia of C. gloeosporioides I-2 held at 62 and 86% RH for 4 weeks retained viability, and some were capable of forming appressoria when placed at 100% RH. These results have implications for epidemiological models for disease control.

Item Type: Article
Uncontrolled keywords: anthracnose; appressoria; Colletotrichum; epidemiology; germination; mango; postharvest disease
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Biosciences
Depositing User: O.O. Odanye
Date Deposited: 19 May 2009 00:17
Last Modified: 04 May 2012 14:32
Resource URI: http://kar.kent.ac.uk/id/eprint/16076 (The current URI for this page, for reference purposes)
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