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Genotype × environment interaction on the yield of spring oilseed rape (Brassica napus) under rainfed conditions in Argentine Pampas

Published online by Cambridge University Press:  13 August 2019

L. E. Puhl
Affiliation:
Departament of Quantitative Methods and Information Systems, School of Agriculture, University of Buenos Aires, Av. San Martin 4453 (C1417DSE) Buenos Aires, Argentina
D. J. Miralles
Affiliation:
Departament of Crop Production, School of Agriculture, University of Buenos Aires, Av. San Martín 4453 (C1417DSE) Buenos Aires, Argentina IFEVA, University de Buenos Aires and CONICET, School of Agriculture, Av. San Martin 4453 (C1417DSE) Buenos Aires, Argentina
C. G. López
Affiliation:
Faculty of Agricultural Sciences, National University of Lomas de Zamora, Juan XXIII and Ruta 4, Llavallol (B1836), Buenos Aires Province, Argentina Faculty of Agricultural Sciences, IIPAAS, Institute of Research on Agricultural Production, Environment and Health, National University of Lomas de Zamora, Juan XXIII and Ruta 4, Llavallol (B1836), Buenos Aires Province, Argentina
L. B. Iriarte
Affiliation:
INTA Barrow, Integrated Experimental Farm, Ruta 3 Km 488, (7500) Tres Arroyos, Buenos Aires Province, Argentina
D. P. Rondanini*
Affiliation:
Departament of Crop Production, School of Agriculture, University of Buenos Aires, Av. San Martín 4453 (C1417DSE) Buenos Aires, Argentina Faculty of Agricultural Sciences, IIPAAS, Institute of Research on Agricultural Production, Environment and Health, National University of Lomas de Zamora, Juan XXIII and Ruta 4, Llavallol (B1836), Buenos Aires Province, Argentina CONICET, National Council of Scientific and Technological Research, Av. Godoy Cruz 2290 (C1425FQB) Buenos Aires, Argentina
*
Author for correspondence: D. P. Rondanini, E-mail: rondanin@agro.uba.ar

Abstract

Oilseed rape seed yield has increased in the last 40 years in most countries, but this yield gain has not been accompanied by greater yield stability. The current study aimed to quantify the genotype by environment (G × E) interaction on oilseed rape yield, identify genotypes with broad adaptability and the main environmental drivers related to seed yield. A weighted two-stage mixed-model analysis was applied to official multi-environment trials of nine spring genotypes (G), in three locations (L) during 6 years (Y) on central and southern Argentine Pampas under rainfed conditions. Best linear unbiased prediction of seed yield ranged from 0.37 to 3.73 kg/ha. Fixed effect L × Y was highly significant and G variability was estimated as 130 kg/ha of standard deviation. Contrasting genotypes were identified by Shukla's stability index and two of those showed the best yield performance in the wettest year. Factor analysis explained 0.75 of total variation and discriminated genotypes with broad and specific adaptability, as well as combined environments according to the similarities in seed yield of the evaluated genotypes. Environmental loadings of Factor 2 were linearly associated with cumulative rainfall in the post-flowering period (up to 230 mm). It is concluded that (i) a significant G × L × Y interaction underlies the high variability of seed yield, (ii) two genotypes (G6 and G7) with high yield stability were identified, and (iii) G × E effects are associated with post-flowering rainfall.

Information

Type
Crops and Soils Research Paper
Copyright
Copyright © Cambridge University Press 2019 

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