International Journal of Plant Breeding and Genetics1819-35952152-3347Academic Journals Inc.10.3923/ijpbg.2013.105.114Oryza sativa L.) Under Two Ecologies in Nigeria]]>NassirAdesola L.2201372Seasonal variation in the grain yield of rice in upland tropical ecology stimulate the compelling need to develop a fairly stable cultivar for the low input farmers across fairly wide cultivation zones. Yield analysis has always been the main focus but the complex interaction of the panicle and grain attributes are equally important. Fifteen upland rice (Oryza sativa L.) varieties were cultivated in five environments in Ago-Iwoye (rain forest ecology) and Ayetoro (derived savannah ecology) of South Western Nigeria. Data were collected on panicle and grain yield characters and subjected to genotype by environment analysis using the additive main effect and multiplicative interaction, AMMI and the genotype and genotype and environment interaction (GGE). From the AMMI analysis, the genotype, environment and the interaction components jointly captured 71.8% of the total sum of squares (TSS). The environment accounted for 62.25% of treatment sum of squares while the interaction and genotype portion was 26.8 and 10.95%, respectively. The GGE biplot summarized 64.2% of the interaction component and separated the genotypes and cultivation environments into three groups. The GGE Interaction Principal Component Axis (IPCA) 1 was significantly correlated with grain length (-0.621) while the GGE IPCA 2 had significant correlation with primary branching (0.636) and spikelets fertility (-0.604). WAB (96-1-1) had the highest grain production and appeared to be adaptable to E3 and E5 which are low rainfall environments. Other matters important to genotype by environment interaction as a guide for development of high yielding and fairly stable varieties are discussed.]]>Anonymous,19883rd Edn.,Pages: 54Pages: 54Acuna, T.L.B. and L.J. Wade,2012137117125Acuña, T.L.B., H.R. Lafitte and L.J. Wade,2008108117125Cairns, J.E., T.L.B. Acuna, F.A. Simborio, G. Dimayuga and M.L. Praba et al.,2009Oryza sativa L.).]]>114159168Egesi, C.N., P. Ilona, F.O. Ogbe, M.O. Akoroda and A. Dixon,20079911371142Gauch, H.G.,20064614881500Gunasekera, C.P., L.D. Martin, K.H.M. Siddique and G.H. Walton,2006Brassica juncea L.) and canola (Brassica napus L.) in Mediterranean-type environments II. Oil and protein concentrations in seed.]]>251321Hoffmann, C. M., T. Huijbregts, N. van Swaaij and R. Jansen,2009301726Kato, T.,19973714721475Kamoshita, A., C.R. Babu, N.M. Boopathi and S. Fukai,2008109123McLaren, C.G. and R.C. Chaudhary,19941994Nassir, A.L. and O.J. Ariyo,2006Oryza sativa).]]>60161172Nassir, A.L. and O.J. Ariyo,2007Oryza sativa L.) in a tropical habitat.]]>364757Nassir, A.L. and O.J. Ariyo,201139220225Ouk, M., J. Basnayake, M. Tsubo, S. Fukai and K.S. Fischer et al.,2007101145154Padmavathi, N., M. Mahadevappa and O.U.K. Reddy,1996Oryza sativa L.]]>12353357Pantuwan, G., S. Fukai, M. Cooper, S. Rajatasereekul and J.C. O'Toole,2002Oryza sativa L.) genotypes to drought under rainfed lowlands. 2. Selection of drought resistant genotypes.]]>73169180Rao, S.A., M.A. Khan, T.M. Neilly and A.A. Khan,1997Oryza sativa L.).]]>5115Samonte, S.O.P., L.T. Wilson, A.M. McClung and J.C. Medley,20054524142424Selvarani, M. and P. Rengadamy,1998855758Shrestha, S., F. Asch, J. Dusserre, A. Ramanantsoanirina and H. Brueck,2012134216228Suarez, E., R. Alganso, R. Perez and J. Iglesas,1989141010Wade, L.J., C.G. McLaren, L. Quintana, D. Harnpichitvitaya and S. Rajatasereekul et al.,1999643550Yan, W., L.A. Hunt, Q. Sheng and Z. Szlavnics,200040597605Yan, W. and L.A. Hunt,2001411925Yan, W., P.L. Cornelius, J. Crossa and L.A. Hunt,200141656663Yan, W., M.S. Kang, B. Ma, S. Woods and P.L. Cornelius,200747643653Zobel, R.W., M.J. Wright and H.G. Gauch,198880388393