Epidemiology of the Groundnut (Arachis hypogaea L.) Leaf Spot Disease: Genetic Analysis and Developmental Cycles

Tshilenge-Lukanda, L. and Nkongolo, K.K.C. and Kalonji-Mbuyi, A. and Kizungu, R. (2012) Epidemiology of the Groundnut (Arachis hypogaea L.) Leaf Spot Disease: Genetic Analysis and Developmental Cycles. American Journal of Plant Sciences,, 3 (5). pp. 582-588.

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Groundnut leaf spot is one of the important factors limiting groundnut productivity in Africa particularly in the Democratic Republic of Congo (DR Congo). Early and late leaf spot disease of groundnut caused by Cercospora arachidicola Hori and Cercosporidium personatum (Berk & Curt.) Deighton, respectively, can cause considerable yield losses without fungicide management. The main objectives of this research were to analyze plant and disease developmental cycles. Significant differences were observed among the groundnut varieties evaluated for resistance to the leaf spot disease. The results show that plant development cycle can be divided into three developmental stages. A first stage characterized by a low production of leaves, a second stage with a significant leaf development and finally a third stage with a reduction of leaves. Interestingly, the leaf spot disease cycle was also divided in three stages. The disease stage characterized by the highest level of symptom expression was not associated with the plant phase with the highest emerged leaves. Disease symptoms reached the highest pick only after the phase of intense leaf development. The molecular analysis revealed that all the groundnut varieties analyzed were genetically closely related even though they showed different reactions to the leaf spot disease.

Item Type: Article
Uncontrolled Keywords: Groundnut; Leaf Spot; Cercospora arachidicola; Cercosporidium personatum; DR Congo; Genetic Variation
Author Affiliation: 1Department of Genetics and Plant Breeding, Regional Nuclear Energy Center, Kinshasa, DR Congo; 2Faculty of Agronomy, Uni-versity of Kinshasa, Kinshasa, DR Congo; 3Department of Biological Sciences, Laurentian University, Sudbury, Canada.
Subjects: Plant Protection
Crop Improvement
Divisions: Groundnut
Depositing User: Mr. SanatKumar Behera
Date Deposited: 31 May 2012 06:20
Last Modified: 31 May 2012 06:20
Official URL: http://dx.doi.org/10.4236/ajps.2012.35070
URI: http://eprints.icrisat.ac.in/id/eprint/5992

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