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Inter-specific rice progeny lines (Oryza glaberrima × Oryza sativa) were evaluated for African rice gall midge resistance at two locations in 2010 cropping season. The experiment was made of 16 rice progeny lines including the two parents; FARO52 and Tog 7442 and a known susceptible check FARO 37. The experiment was conducted in the lowland experimental fields of National Cereals Research Institute at Badeggi and Edozhigi. The fields were laid out in a randomized complete block design in three replications. Gall midge was scored at 42 and 63 days after transplanting, other parameters collected include plant height, days to 50% flowering and grain yield. Principal component analysis indicates that the first three principal components accounted for 64.5% of the total variation in the population across the two locations. Correlation analysis showed a negative correlation (P=0.05) between percentage midge infestations at 63 DAT with number of panicle squared meter. Grain yield did not correlate significantly (P=0.05) with percentage gall midge infestation at 42 and 63 DAT, but there was a significant positive correlation (P=0.05) between percentage gall midge infestation at 42 and 63 DAT. Result revealed that FAROX 521-E-900-1, FAROX 521-H-559-1 and FAROX 521-H-686-1 are found to be resistance to African rice gall midge (AfRGM), while FAROX 521-E-430-1 and FAROX 521-H-433-1 gave a better yield potential under midge infestation and could be used for further genetics studies.

journal of plant breeding and crop science

Effect of African rice gall midge on yield and its components on inter-specific rice progenies, using correlation and principal components as analysis tools