Identification of QTL associated with silicon and zinc content in rice (Oryza sativa L.) and their role in blast disease resistance

Hanamareddy Biradar; M. V. Bhargavi; Ravindra Sasalwad; Ramakrishna Parama; Shailaja Hittalmani

Hanamareddy Biradar Dept. of Agricultural Chemistry and Soil Scences, University of Agricultural Sciences, G.K.V.K., Bangalore 560 065
M. V. Bhargavi Dept. of Agricultural Chemistry and Soil Scences, University of Agricultural Sciences, G.K.V.K., Bangalore 560 065
Ravindra Sasalwad Dept. of Agricultural Chemistry and Soil Scences, University of Agricultural Sciences, G.K.V.K., Bangalore 560 065
Ramakrishna Parama Dept. of Agricultural Chemistry and Soil Scences, University of Agricultural Sciences, G.K.V.K., Bangalore 560 065
Shailaja Hittalmani Dept. of Agricultural Chemistry and Soil Scences, University of Agricultural Sciences, G.K.V.K., Bangalore 560 065

Keywords: Silicon, zinc, mapping, micronutrients and quantitative trait loci.

Abstract

ATL associated with zinc (Zn) and silicon (Si) content in rice were identified and mapped on different rice chromosomes. Based on interval mapping, a aTL was detected for silicon content on chromosome three and this aTL showed positive additive effect of 0.054 and explained 12.9% phenotypic variation. Additionally, single marker analysis results identified eighteen aTL for silicon content on different chromosomes. Similarly, a total of six aTL were identified for zinc content in rice seeds using single marker analysis and mapped one each on chromosome number 1, 4, 5, 8, 9 and 11. These aTL individually explained 4.4% to 9.5% phenotypic variation. The identified aTL were mapped on chromosome regions having blast resistance aTL and candidate genes for blast resistance. The overlapping of silicon and zinc aTL and disease resistance loci on same chromosome regions suggested their positive role in blast disease resistance.