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Articles by K. Futakuchi
Total Records ( 4 ) for K. Futakuchi
  M.N. Ndjiondjop , P.A. Seck , M. Lorieux , K. Futakuchi , K.N. Yao , G. Djedatin , M.E. Sow , R. Bocco , F. Cisse and B. Fatondji
  Rice varieties response to drought has been extensively studied and many lines have been released, but identifying new tolerant lines is still a challenge for scientists due to the complexity and the specificity of this constraint over environments. Three sets of field experiments were conducted between 2006 and 2008 at Africa Rice Center research station, Togoudo, Benin to evaluate the effect of drought on some traits of rice (Oryza sp.). Three genotype types including 202 interspecific lines, from a cross between WAB56-104 (O. sativa subsp. japonica) and CG14 (O. glaberrima), adapted to upland conditions, 60 chromosome segment substitution lines made for lowland conditions and 211 accessions of O. glaberrima Steud., were evaluated using a split plot design replicated twice or thrice and an alpha lattice design with four blocks. There was a consistent negative effect of drought on plant height and grain yield across genotypes’ drought-tolerance levels and across genotype/types. Plant height and grain yield were more reduced for sensitive genotypes than for moderately tolerant and tolerant genotypes. Flowering and maturity were consistently delayed across genotype types and tolerance levels. Mean delays of 6.5, 21.8 and 9.4 days were observed for start, 50 and 100% flowering, respectively. Maturity was also delayed, with consistency across genotype types. However, no clear picture of drought effect on flowering and maturity was observed in terms of differences among drought-tolerance levels. The effects of drought on the number of tillers and on leaf temperature were not consistent. Plant height and grain yield showed the clearest differences between genotype-tolerance levels. Genotypes 151-3-8, 104-3-5, 116-2-4, 117-2-6, MPL-15-3, MPL-202-3, SENL-21-2, SENL-10-1, SENL-17-2, SENL-26-3, TOG5691, TOG6679 and TOG5591 yielded higher than the parents and checks.
  K. Futakuchi , M. Fofana and M. Sie
  To identify resistant genotypes to lodging in African rice (Oryza glaberrima), 6 genotypes, three of which were selected by prescreening for the resistance and the remaining three were used in an interspecific breeding program at WARDA, were tested in terms of resistance to lodging. The trial was conducted in rainfed upland in 2005 and in irrigated lowland in 2006 and all genotypes showed higher yield and larger plant length in 2006 than in 2005. There was a clear varietal difference in lodging incidence of the O. glaberrima genotypes at maturity, which was ranged from 0.0 to 91.0% and from 68.6 to 99.7% in 2005 and 2006, respectively. In 2005, four O. glaberrima genotypes, TOG 7235, IRGC Accession Code 104038, CG 14 and CG 20, depicted the resistance at maturity since their lodging incidences were from 0.0 to 6.7%. With heavier panicles by higher yield and larger plant length in 2006, however, two of those four genotypes almost completely lodged at maturity. The remaining two genotypes, TOG 7235 and CG 14, showed moderately low lodging incidences of 74.1 and 68.6%, respectively. However, those rates are still very high as a commercial variety and further screening for lodging resistance is necessary.
  Kayode A. Sanni , O.J. Ariyo , D.K. Ojo , G. Gregorio , E.A. Somado , I. Sanchez , M. Sie , K. Futakuchi , S.A. Ogunbayo , R.G. Guei and M.C.S. Wopereis
  Genotype by Environment Interaction (GEI) is a major complications in plant breeding. We used Additive Main Effects and Multiplicative Interaction (AMMI) to evaluate the effects of GEI in NERICA rice genotype and their adaptation in two years at three locations; Ibadan-7°30’ N, 3°58’ E, 210 m.a.s.l. (Nigeria), Cotonou-6°24’ N, 2°19’ E, 15.5 m.a.s.l. and Deve-6°48’ N, 1°47’ E, 72 m.a.s.l. (Benin Republic). Twenty two rice genotypes were grown in 2005 and 2006 under upland condition, using randomized complete block design with three replications. Main effects due to environments (E), genotypes (G) and GxE interaction (GEI) were significant (p<0.01), with the highest variation of 43.1% accounted for by environmental effects. The first four Interaction Principal Component Axes (IPCA1, 2, 3 and 4) were significant (p<0.01) and cumulatively contributed 98.5% of the total GEI. AMMI biplot accounted for 91.4% of the total sum of squares. The stability study indicated that NERICAs 3, 10, 11 and 18 could be considered stable in any of the environments, due to their low interactions. However, NERICA 11 was the most promising of the genotypes, with high yield (5.15 t ha-1) and a broad environmental adaptation.
  D. Montcho , K. Futakuchi , C. Agbangla , M. Semon , I. Dieng and M. Sie
  Oryza glaberrima is often classified into two ecological groups: upland and floating types. To assess the phenotypic variability of O. glaberrima across hydrological conditions, 217 accessions and 5 checks (Oryza sativa) were cultivated using toposequence. The trial was conducted at the experimental field of the International Institute of Tropical Agriculture in Ibadan during the wet seasons in 2009 and 2010. An Alpha Lattice design with three replications was used. Phenotypic data including vegetative vigor, plant height and tillers number at maturity, days to 50% heading and crop duration were recorded. The results indicated high variability among all O. glaberrima tested across ecologies for plant height, tiller ability and crop duration. This variability was confirmed by low genetic correlation coefficients, which demonstrated the significance of genotype by environment interaction. Oryza glaberrima accessions tested showed best vegetative vigor from upland to lowland. In 2009, 77.5 and 82.2% of the accessions were tall in hydromorphic and lowland, respectively while they represented 87.5 and 84.8%, respectively in 2010. Tillers number was intermediate from upland to lowland in both years. Result in 2009 indicated that 54.5% in upland, 70.9% in hydromorphic and 45.3% in lowland of O. glaberrima were intermediate tillering. The second season showed 63.2% in upland, 79.1% in hydromorphic and 82.1% in lowland. High percentage of O. glaberrima accessions was observed as late and very late maturing in 2009, 89.9% in upland and 91.4% in lowland. This study support efforts to breed for phenological plasticity in any rice growing environment.
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