Submitted to: Book Chapter
Publication Type: Book / chapter
Publication Acceptance Date: 3/25/2014
Publication Date: 4/23/2014
Citation: Shakiba, E., Eizenga, G.C. 2014. Unraveling the secrets of rice wild species. In: Yan, W., Bao, J., editors. Rice - Germplasm, Genetics and Improvement. InTech. DOI. 10.5772/58393. Interpretive Summary: The world’s population will soon reach 9 billion people. We need to rediscover some of the genes lost during domestication. New genes for improving rice are available in the rice wild species. Rice wild species are an under-utilized source of genes for rice improvement. Herewithin we summarize the novel genes identified in the rice wild species. We summarize the contributions of 13 different Oryza species to rice improvement. In the past decade genes for resistance to blast, brown planthopper and tolerance to heat, acid sulfate soils have been incorporated into cultivars.
Technical Abstract: The rice wild species (Oryza spp.) genepool is a relatively untapped source of novel alleles for crop improvement. Several different accessions of rice wild species have been crossed as donor parents with several different Asian rice (O. sativa) cultivars, as the recurrent parent to develop mapping populations of 200-300 backcross progeny in most cases. These populations were genotyped with approximately 150 DNA markers to identify quantitative trait loci (QTLs). QTL analysis of these populations revealed over 45 traits related to increased plant height, days to heading, days to maturity, yield and yield components, higher values for grain quality traits, resistance to rice diseases and insect pests; and tolerance to drought, cold, salt, acid soils and flooding stress where the trait being targeted for improvement was attributed to the Oryza species parent.