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GrainGenes Reference Report: IPK-6-525

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Reference	IPK-6-525
Title	Inheritance and allelism of resistance to Russian Wheat Aphid, Diuraphis noxia (Mordvilko) in Iranian wheat cultivars
Journal	International Journal of Agriculture and Biology
Year	2004
Volume	6
Pages	525-528
Author	Mirak TN [ Show all 6 ]
Abstract	The Russian Wheat Aphid (RWA), D. noxia is one of the major pests on cereal especially wheat and barley in some cereal-growing regions of the world. The use of resistant cultivars is an effective strategy to control RWA. This genetic study was conducted to determine the inheritance and allelic relationship of RWA resistance in two Iranian cultivars 'Azadi' and 'Omid'. The resistant cultivars were crossed with each other and to a susceptible cultivar 'Sholeh'. Seedlings of the parents, F1, F2, BCS (backcross to the susceptible parent) and BCR (backcross to the resistant parent) were screened for resistance to RWA under greenhouse conditions. The response of seedlings to RWA was scored 21 days after artificial infestation using a 1-9 scale for leaf chlorosis and a 0-3 scale for leaf rolling. Unlike previous studies, leaf chlorosis and leaf rolling were considered as two separate traits. Different phenotypic segregation ratios were tested in the F2 population for goodness of the fit. The results of leaf chlorosis measurements showed that one and two dominant genes control the resistance to RWA in 'Azadi' and 'Omid', respectively. Leaf rolling measurements indicated that resistance in the 'Azadi' cultivar is governed by one recessive gene and in 'Omid' by two genes, one dominant, and one recessive. Segregation in the F2 population of the cross between two resistant cultivars indicated that their resistance genes are different for the two traits. Therefore, these different genes can be incorporated into an adapted wheat cultivars in order to produce a more durable resistance
Keyword	allelism [ Show all 16 ]

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