National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Kavya, a high yielding, gall midge resistant (Gm1), Medium Slender (MS) grain type rice variety with 135 days of duration, but is susceptible to biotype 4M prevalent in Warangal condition (Telangana State, India). Considering the susceptibility of Kavya to gallmidge resistance especially for biotype GMB4M, we crossed Kavya with a gallmidge resistant introgression line of Samba Mahsuri (RP-4516-3-6) possessing the two gallmidge resistant genes i.e. gm3 and Gm8. The true F1s were selfed and the F2 plants were subjected to marker-assisted selection (MAS) for gm3 and Gm8 genes by using functional/gene linked markers. The ‘double’ positive F2 plants were further screened with Gm1 gene linked marker, since the recurrent itself possessing Gm1 gene. The ‘triple’ positive plants (i.e., Gm1, gm3 and Gm8) were selfed and their progeny were subjected to MAS for Gm1, gm3 and Gm8 genes coupled with phenotype based visual selection for agro-morphological characters. At F5 generation, one improved line (i.e., WGL-1068) possessing gallmidge resistance (Gm1, gm3 and Gm8 genes), higher yield than Kavya and fine-grain type was identified. The best improved line of Kavya i.e. WGL-1068, after further evaluation for 2-3 seasons will be nominated for multi-location trials under All India Coordinated Rice Improvement Project (AICRIP) for their release to the farming community.
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