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http://dx.doi.org/10.5423/PPJ.NT.09.2015.0183

Changes in the Aggressiveness and Fecundity of Hot Pepper Anthracnose Pathogen (Colletotricum acutatum) under Elevated CO2 and Temperature over 100 Infection Cycles  

Koo, Tae-Hoon (Department of BT-Convergent Pharmaceutical Engineering, Sunmoon University)
Hong, Sung-Jun (Department of BT-Convergent Pharmaceutical Engineering, Sunmoon University)
Yun, Sung-Chul (Department of BT-Convergent Pharmaceutical Engineering, Sunmoon University)
Publication Information
The Plant Pathology Journal / v.32, no.3, 2016 , pp. 260-265 More about this Journal
Abstract
We observed the changes in aggressiveness and fecundity of the anthracnose pathogen Colletotrichum acutatum on hot pepper, under the ambient and the twice-ambient treatments. Artificial infection was repeated over 100 cycles for ambient ($25^{\circ}C/400ppm$ $CO_2$) and twice-ambient ($30^{\circ}C/700ppm$ $CO_2$) growth chamber conditions, over 3 years. During repeated infection cycles (ICs) on green-pepper fruits, the aggressiveness (incidence [% of diseased fruits among 20 inoculated fruits] and severity [lesion length in mm] of infection) and fecundity (the average number of spores per five lesions) of the pathogen were measured in each cycle and compared between the ambient and twice-ambient treatments, and also between the early (ICs 31-50) and late (ICs 81-100) generations. In summary, the pathogen's aggressiveness and fecundity were significantly lower in the late generation. It is likely that aggressiveness and fecundity of C. acutatum may be reduced as global $CO_2$ and temperatures increase.
Keywords
ambient $CO_2$; climate change; pathogenicity; reproductive fitness; twice-ambient $CO_2$;
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