This research studied the genotype x environment interaction (G x E), the adaptability and phenotypic stability, by applying AMMI (Additive Main Effects and Multiplicative Interaction Analysis) method for evaluating seed yield of soybean lines in F10 and F11 generations. The material included three populations derived from a 4 x 4 partial diallel having four insect resistant parents (IAC-100, Crockett, Lamar, D72-9601-1) and other four parents (BR-6, IAS-5, Davis, Ocepar-4) which are early and have high seed yield. In the F2 generation it were used three procedures of plant selection: PCI, population derived from F2 plants under total control of insects; PRIM and PRIS, populations obtained from F2 plants after the selection for resistance to leaf-feeder (defoliating) and pod-feeder (stink bug complex) insects, respectively. From F3 to F11, it was performed selection for seed yield and photoperiod tolerance among progenies. Twenty four experiments were carried out in randomized complete block design with two replications subdivided in sets with common checks, by testing the three populations in eight environments (E1 to E8): two locations (Anhembi, Areão), two agriculture years (1999/2000, 2000/2001), and two management systems (CII: intensive control of insects; CEI: ecological control of insects). Each experiment included 40 and 20 lines from a population in 1999/2000 and 2000/2001 respectively. Based on seed yield, it was concluded that: the AMMI method evidenced large percentage of high yielding and stable lines in all three populations: 70% in PCI, 65% in PRIS, and 55% in PRIM; the Anhembi location showed higher seed yield in all situations; for the three populations, among the environments with high seed yield, the AMMI method classified E1 (Anhembi, 1999/2000, CII) and E6 (Anhembi, 2000/2001, CEI) as the most stable and unstable environment respectively; lines with superior adaptability and stability originated from the following parents: IAC-100, D72-9601-1, BR-6, Davis, and IAS-5; outstanding biparental crosses occurred when the IAC-100 parent was crossed with IAS-5, Davis, OCEPAR-4 and BR-6.
Glycine max; genotype-environment interaction; AMMI model; seed yield
