Multi-attribute responses of maize inbred lines across managed environments |
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Authors: | Karina E D’Andrea María E Otegui Abelardo J de la Vega |
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Institution: | (1) Dpto. de Producción Vegetal, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453 (C1417DSE), Ciudad de Buenos Aires, Argentina;(2) Dpto. de Producción Vegetal, Facultad de Agronomía, Universidad de Buenos Aires, IFEVA, CONICET, Av. San Martín 4453 (C1417DSE), Ciudad de Buenos Aires, Argentina;(3) Advanta Semillas S.A.I.C., Ruta Nac. 33 Km 636, CC 559, Venado Tuerto, 2600, Argentina |
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Abstract: | In maize (Zea mays L.) breeding programs, selection among and within segregating progenies is based mainly on indirect selection criteria. A
better understanding of the environment influence on physiological attributes of maize inbred lines is important to the identification
and selection of superior inbred lines as well as to successful hybrid seed production. In this study, the size and form of
genotype (G) and genotype × environment (G × E) interaction effects for plant grain yield (PGY) and several physiological
attributes were examined for 12 maize inbred lines grown in four managed environments, represented by two seasons (Y) and
two nitrogen levels. Mixed model analysis revealed that the G effect was relatively high for attributes related to light capture,
phenology, early biomass production, and numerical components of PGY. The G × E interaction effect explained most of the variability
for PGY, harvest index (HI), and biomass production at maturity. Three-mode principal component analysis allowed us to: (1)
describe the associations among multiple attributes across environments, (2) reveal the form of the main patterns of G × E
interaction, (3) establish the importance of the genotype × year (G × Y) interaction for kernel number, HI, and biomass at
maturity in determining PGY, (4) identify promising genotypes of high-PGY across environments, and (5) detect genotypes of
similar response patterns for PGY but with a contrasting relative behavior for other attributes, which may permit the simultaneous
selection for grain yield and desired secondary traits. Such selection results would contribute greatly in the identification
of superior inbreds than selecting for grain yield alone.
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Keywords: | G × E interaction Maize inbred lines Managed environments Physiological attributes Three-mode pattern analysis |
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