Evaluation of germplasm Capsicum collection against to tobacco etch virus (TEV)
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Abstract
138 accessions of Capsicum collection belong to the INIFAT Genebank were evaluated. These accessions belonging to the C. annuum-chinense-frutescens Complex. The cultivars were evaluated using qualitative characters: Fruit type and Pungency and the quantitative character: Infection rate against to Tobacco etch virus (TEV). The accessions behavior were registered during two years in different evaluation moments, using a susceptible control 'California Wonder' for the comparison of the diseases development. The data were processed by Factorial Analysis of Simple Correspondence in order to the germplasm classification and this base the best cultivars were selected. The insects populations density was determined by means of direct observation plants and the insects dynamics concurrence was evaluated. It was observed that, the relationship existent among the virus-vector-host with the cultivation cycle, the favorable climatic conditions of wind speed and temperature, as well as the natural reserve present in the cultivation fields, was appropriate for the expression on high degree of the TEV during the evaluation years. A wide variability was detected in the germplasm studied; they stood out 34 accessions with low infection index; what represents that 25% of the germplasm evaluated offers resistance to the virus under natural infection conditions, for what they constitute a valuable genetic reserve for the improvement programs.
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References
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