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The varieties with erect panicles used in rice breeding have led to a significant increase in rice yield. But the molecular mechanism of erect panicle remains elusive. Oryza glumaepatula, with the erect panicle phenotype, is an excellent gene pool to improve Asian cultivated rice O. sativa. In this study, a backcross introgression line was derived with Dianjingyou 1, a japonica cultivar, as the recurrent...
Oryza longistaminata with strong resistance to biotic and abiotic stress was regarded as an excellent gene pool for Asian cultivated rice improvement. Thus, mining and utilization of favorable genes/alleles from O. longistaminata would be important in breeding for Oryza sativa by broadening its genetic basis. To explore blast resistance genes from O. longistaminata...
Oryza longistaminata is an excellent gene pool to improve Asian cultivated rice Oryza sativa. However, hybrid sterility between O. longistaminata and O. sativa hinders application of desirable genes in rice production. In order to further understand the nature of interspecific hybrid sterility between these two species, near isogenic lines (NILs) were raised with RD23, an indica cultivar...
A chromosomal region containing a hybrid sterility locus, S1, from Oryza glaberrima, located on the short arm of chromosome 6, was investigated in 15 BC7F1 and one BC3F2 populations. As a gamete eliminator, S1 induced both male and female gamete abortion and responded to typical, spherical, or empty pollen abortion when it was heterozygous. The gametes carrying S1a (Oryza sativa allele in...
To further understand the nature of hybrid sterility between Oryza sativa and Oryza glaberrima, quantitative trait loci (QTL) controlling hybrid sterility between the two cultivated rice species were detected in BC1F1 and advanced backcross populations. A genetic map was constructed using the BC1F1 population derived from a cross between WAB450-16, an O. sativa cultivar, and CG14, an O. glaberrima...
Two species in genus Oryza, O. glaberrima and O. glumaepatula, are valuable and potential sources of useful genes of interest for rice improvement. However, the hybrid sterility between O. sativa and these two species is a main reproduction barrier when transferring the favorable traits/genes to mbox{O. sativa.} To overcome it, the nature of hybrid sterility should be understood further. The objective...
Several upland Japonica breeding lines, WAB450-11-1-3-P40-HB (Abbreviated as WAB450-11), WAB450-11-1-2-P61-HB (WAB450-13), WAB450-l-B-P-91-HB (WAB450-14), IRAT216, IRAT359, and IRAT104, possessing restoring ability for the Dian 1 type cms (cms-D) line Dianyu 1A were recently identified at Food Crops Research Institute, Yunnan Academy of Agricultural Sciences, P. R. China. In this study, the inheritance...
Some sources of cytoplasm have been favoredin rice breeding for unknown reasons. Tostudy cytoplasmic effects on agronomictraits, five core japonica parents inOryza sativa, Xinan 175, Reimei,Keqing No. 3, Todorokiwase, and Toride No.1, which are ancestors of 75 % of cultivarsbred in Yunnan, China, were used as femaleparents in crosses with 3 distinctjaponica rice cultivars, 8-126,Lijiangxintuanheigu,...
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