Influence of a mutation to improve the undesirable traits (shattering, red caryopsis etc.) of wild rice O. longistaminata while preserving its useful genes by radiation 20 Kr gamma rays from 60Co was studied. The mu...Influence of a mutation to improve the undesirable traits (shattering, red caryopsis etc.) of wild rice O. longistaminata while preserving its useful genes by radiation 20 Kr gamma rays from 60Co was studied. The mutants issued this irradiation were crossed with the interspecific variety SIK385-b-42-28-28 (O. glaberrima x O. sativa). Irradiation followed by crossing with interspecific variety generated a large genetic variability, in the subsequent generations, in plant height, maturity, non-shattering grain, kernel colour, spikelets fertility, panicle length, and grain size. This has resulted in identification of promising mutants which possess all the traits of cultivated rice O. sativa (white kernel, non-shattering grain, secondary branchies etc.). During 2012 rainy season, nineteen selected mutants from M5 and M7 generations were evaluated for yield potential in replicated trials at Longorola station.展开更多
This paper traces the origins and achievements of the R^seau Ouest et Centre Africain du Riz--ROCARIZ (West and Central Africa Rice Research and Development Network). The ROCARIZ institutional arrangement showed tha...This paper traces the origins and achievements of the R^seau Ouest et Centre Africain du Riz--ROCARIZ (West and Central Africa Rice Research and Development Network). The ROCARIZ institutional arrangement showed that rice science is approached from multi-stakeholder perspectives that place end users and entrepreneurs at the center of research for development, and collaboration among rice-based stakeholders can be enhanced and sustained. The ROCARIZ used competitive research grants through multi-stakeholder task forces to generate, adapt, and facilitate the adoption of rice-based technologies and approaches by resource poor households. The grants contributed to: (1) farmer adoption of high yielding and multiple stress resilient lowland NERICAs (New Rices for Africa) (NERICA-L); (2) producer access to credit and services resulting in increased marketing of quality seed rice, paddy, and grain rice by farmer entrepreneurs and poor rural households; (3) improved skills of stakeholders on the use of impact assessment tools to demonstrate adoption of rice-based technologies; (4) enhanced skills of rice breeders in molecular assisted marker selection to shorten the varietal development process; and (S) experiential learning and sharing to improve access to information and knowledge.展开更多
文摘Influence of a mutation to improve the undesirable traits (shattering, red caryopsis etc.) of wild rice O. longistaminata while preserving its useful genes by radiation 20 Kr gamma rays from 60Co was studied. The mutants issued this irradiation were crossed with the interspecific variety SIK385-b-42-28-28 (O. glaberrima x O. sativa). Irradiation followed by crossing with interspecific variety generated a large genetic variability, in the subsequent generations, in plant height, maturity, non-shattering grain, kernel colour, spikelets fertility, panicle length, and grain size. This has resulted in identification of promising mutants which possess all the traits of cultivated rice O. sativa (white kernel, non-shattering grain, secondary branchies etc.). During 2012 rainy season, nineteen selected mutants from M5 and M7 generations were evaluated for yield potential in replicated trials at Longorola station.
文摘This paper traces the origins and achievements of the R^seau Ouest et Centre Africain du Riz--ROCARIZ (West and Central Africa Rice Research and Development Network). The ROCARIZ institutional arrangement showed that rice science is approached from multi-stakeholder perspectives that place end users and entrepreneurs at the center of research for development, and collaboration among rice-based stakeholders can be enhanced and sustained. The ROCARIZ used competitive research grants through multi-stakeholder task forces to generate, adapt, and facilitate the adoption of rice-based technologies and approaches by resource poor households. The grants contributed to: (1) farmer adoption of high yielding and multiple stress resilient lowland NERICAs (New Rices for Africa) (NERICA-L); (2) producer access to credit and services resulting in increased marketing of quality seed rice, paddy, and grain rice by farmer entrepreneurs and poor rural households; (3) improved skills of stakeholders on the use of impact assessment tools to demonstrate adoption of rice-based technologies; (4) enhanced skills of rice breeders in molecular assisted marker selection to shorten the varietal development process; and (S) experiential learning and sharing to improve access to information and knowledge.