Indian Society of Genetics & Plant Breeding

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INHERITANCE OF BLAST RESISTANCE IN RICE

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The inheritance of resistance to blast was studied in seven rice cultivars, (BG 367-4, IRAT
102, IR 4547-6-2-5, Milyang 46, Secanado Brazil, Tetep and VL 8) crossed with two blast
susceptible cultivars, VLK 39 and Thapachini. The FI, F2, BCI and BCz generations were
raised and inoculated with the VLH-Kl isolate of Pyricularia oryzae Cay. at seedling stage.
The resistance in 12 out of 15 crosses was found to be governed by a single dominant gene,
while in the cross IR 4547-6-2-5 x Thapachini it was one dominant and one recessive gene.
The cross between two resistant parents, Tetep and VL 8, showed allelic relationship,
whereas the cross between the two susceptible cultivars, VLK 39 and Thapachini, showed
that each cultivar carried a single but different recessive gene for resistance.
 

Keywords: Rice, blast, inheritance, Oryza sativa L., resistance, Pyricularia oryzae Cay.

Info

Year: 1994
Volume: 54
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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