GENETIC ANALYSIS AND MOLECULAR TAGGING OF BLAST RESISTANT GENE IN RICE (Oryza sativa L.) CULTIVARS
Journal Title: International Journal of Agriculture Sciences - Year 2016, Vol 8, Issue 51
Abstract
The inheritance investigation uncovered that blast resistance in R 1013-2307-1-1, R 1124-91-2-73, R 1518-762-3-564-1, R 1558-2423-3-1445-1 and R 1559-2425-2-1449-1 was controlled by a single dominant gene, while two independent dominant genes governed resistance in R 1519-781-5-598-1 and R 1540-1888-1278-1. The allelic studies revealed that genes for resistance present in R 1013-2307-1-1, R 1518-762-3-564-1 and R 1558-2423-3-1445-1 was allelic to Pi-z5 (IRBL 10 and 5173). Among the blast differential genes (monogenic lines) tested, only ‘Pi-z5’ gene consistently imparted complete resistance against the blast population in the Northern Hilly Region of Chhattisgarh, Pi-z, Pi-9 and Pi-kh provided variable level of resistance. On the other hand four genes Pi-z5, Pi-z, Pi-9 and Pi-kh functional in Bastar Plateau (Jagdalpur). The severity of blast disease was considerably higher at Ambikapur station than at Jagdalpur so only one center (Ambikapur) could be reliably used to conduct screening trials. The race of the fungus at these two sites seems to be different. Eight strains viz., R 1518-762-3-564-1, R 1519-781-5-598-1, R 1540-1888-1278-1, R 1558-2423-3-1445-1, B 6441-FMR-6-0-0, F 7-10, IR42221-145-2-3-2 and 5173 showed consistently stable resistant reaction over the years. The gene present in B 6441-FMR-6-0-0 {Pi 48(t)} is a new blast resistance gene. Its relative position in rice chromosome is not known but the primers used for molecular study were found monomorphic.
Authors and Affiliations
S. K. SINHA
Keywords
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