caa a22 4500 477133460 CHVBK 20180405111710.0 cr unu---uuuuu 170330e19970301xx s 000 0 eng 10.1023/A:1002969932224 doi (NATIONALLICENCE)springer-10.1023/A:1002969932224 Interspecific Oryza Sativa L. X O. Glaberrima Steud. progenies in upland rice improvement [Elektronische Daten] [Monty Jones, Michael Dingkuhn, Gabriel Aluko/snm>, Mandé Semon] Fertile interspecific progenies between Oryza sativa L. and O. glaberrima Steud. were produced through backcrossing and doubled haploid breeding (DHB). Backcrossing with the O. sativa parents increased fertility and helped combine the O. sativa and O. glaberrima features. The use of DHB to generate a large proportion of doubled haploids from interspecific F2 hybrids, helped overcome constraints associated with the conventional breeding of these species, such as: (1) slow fixation of the lines, (2) frequent partial sterility of the progenies and (3) low recovery of useful recombinants. Although true interspecific progenies between O. sativa and O. glaberrima were generally rare, their occurrence in some populations was as high as 30%. Some progenies combined the high yield potential of O. sativa, a result of high spikelet number caused by secondary branches on the panicle, with useful traits of O. glaberrima such as rapid leaf canopy establishment and high N responsiveness. The progenies partly inherited the O. glaberrima parents' high specific leaf area (SLA) during early growth, theoretically improving competitiveness with weeds, and from the O. sativa parents the rapid decrease in SLA towards the reproductive stage, theoretically allowing for high leaf photosynthetic rates and high grain yield. Research is in progress to develop new interspecific plant type concepts for resource poor, weed prone upland rice environments in West Africa. Kluwer Academic Publishers, 1997 Wide crosses nationallicence doubled haploid breeding nationallicence weed suppression nationallicence specific leaf area nationallicence low input systems nationallicence water limited systems nationallicence Oryza spp., rice nationallicence Jones Monty West Africa Rice Development Association, 01, BP 2551, Bouaké, Côte d'Ivoire aut Dingkuhn Michael West Africa Rice Development Association, 01, BP 2551, Bouaké, Côte d'Ivoire aut Aluko/snm> Gabriel West Africa Rice Development Association, 01, BP 2551, Bouaké, Côte d'Ivoire aut Semon Mandé West Africa Rice Development Association, 01, BP 2551, Bouaké, Côte d'Ivoire aut Euphytica Kluwer Academic Publishers 94/2(1997-03-01), 237-246 0014-2336 94:2<237 1997 94 10681 https://doi.org/10.1023/A:1002969932224 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1002969932224 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jones Monty West Africa Rice Development Association, 01, BP 2551, Bouaké, Côte d'Ivoire aut NATIONALLICENCE 700 1- Dingkuhn Michael West Africa Rice Development Association, 01, BP 2551, Bouaké, Côte d'Ivoire aut NATIONALLICENCE 700 1- Aluko/snm> Gabriel West Africa Rice Development Association, 01, BP 2551, Bouaké, Côte d'Ivoire aut NATIONALLICENCE 700 1- Semon Mandé West Africa Rice Development Association, 01, BP 2551, Bouaké, Côte d'Ivoire aut NATIONALLICENCE 773 0- Euphytica Kluwer Academic Publishers 94/2(1997-03-01), 237-246 0014-2336 94:2<237 1997 94 10681 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer