Variation in the agronomic characters of introgression lines with wild rice, Oryza officinalis (C genome) , traits in a cultivated rice (O. sativa, A genome) background
Masumizu, C.; Kodama, H.; Kitanosono, R.; Ide, K.; Inazaki, A.; Kaji, R.; Ogawa, T.
Bulletin of the Faculty of Agriculture, Miyazaki University 53(1-2): 33-42
The variation in the agronomic traits of F4 progenies from a cross between O. sativa and O. officinalis, i.e. Norin 29/O. officinalis//Koshihikari, was investigated. Fourteen percent of the progenies showed a spreading plant type, whereas 12% exhibited resistance to bacterial blight [Xanthomonas oryzae pv. oryzae] Both traits were similar to those observed in wild rice. These lines had at least one chromosome segment of wild rice. A large number of the progenies had greater top dry weight and straw weight than the parents or control cultivars, such as Akenohoshi, Kusanohoshi and Hoshiyutaka. The size of the grains in most of the progenies was similar to that in the cultivars. Some of the lines showed a high level of variation in heading date and plant type. The results suggested the possibility of developing a new rice genotype with a higher biomass content than currently used rice cultivars.