Himachal Journal of Agricultural Research

Ruchi Chauhan ¹, Rakesh Kumar Kapila ², Rajeev Rathour ¹

Affiliations
1 Department of Agricultural Biotechnology, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur - 176 062, IN
2 Department of Seed Science and Technology, CSK Himachal Pradesh Krishi Vishvavidyalaya, Palampur - 176 062, IN

Abstract

Rice blast and bacterial leaf blight are the two major diseases affecting rice productivity in north-western Himalayan region of India. Exploitation and utilization of major resistance (R) genes is an effective way to control these diseases. The selected elite BC₂F₂ progenies of four crosses, HPR2143/DHMAS164, HPR2143/PB1, HPR2143/IRBB54 and HPR2143/PR114 were used as a source for blast resistance genes Pita and Pi9, and bacterial leaf blight resistance genes Xa21 and Xa38 respectively. In order to pyramid 2 genes for each disease, hybridization among these backcross derivatives containing single genes was attempted. Overall 346 spikelets were emasculated and pollinated to combine genes, Pita and Pi9, out of which 136 seeds were set with a mean crossability of 39.31 per cent. Similarly to combine genes, Xa21 and Xa38, 335 spikelets were emasculated and pollinated in which 127 seeds were set with an overall crossability of 37.91 per cent. Overall crossability over both sets of crosses (Pita × Pi9) and (Xa21 × Xa38) was recorded to be 38.61 per cent that was comparatively low as compared to earlier documented reports.

Keywords

Rice, Hybridization, Pita, Pi9, Xa21, Xa38.

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