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Asian Journal of Plant Sciences
Year: 2009  |  Volume: 8  |  Issue: 5  |  Page No.: 380 - 384

Study of Genetic Variation of Resistance to Sunn Pest using SPT Index

S.F. Hossaini, R. Haghparast, N. Bahrami and Y. Haghi    

Abstract: To study the response of advanced wheat genotypes to sunn pest, a research was conducted under free and non-free selection for sun pest attack, using a randomized complete block design with 5 replications and 25 genotypes including, 19 advanced bread wheat, 4 durum wheat and 2 checks (Sardari and Azar-2). These genotypes were evaluated in Dryland Agricultural Research Sub-Institute, Kermanshah, Iran during 2007-2008. To identify tolerant genotypes to sunn pest we used SPTI (Sunn pest tolerance index). Significant difference were observed between genotypes for number of damaged central bud, number of adult sunn pest, number of new generation sunn pest, percent of damaged seed, grain yield and thousand seed weight. Based on mean ranks of SPTI, number of damaged central buds and percentage of damaged seeds, PATO1 was the most tolerant genotype and among durum wheat genotype Pgs was the best genotype. This result indicated selection based on grain yield is better than thousand seed weight. Sunn pest tolerance index is an index related to grain yield and it is a new good index for genotype selection. We purpose this index for new experiments.

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