Yield stability and adaptation of Nordic barleys

Authors: Nurminiemi M.¹; Bj0slashrnstad Å.²; Rognli O.A.¹

Source: Euphytica, Volume 92, Numbers 1-2, 1996 , pp. 191-202(12)

Publisher: Springer

Abstract:

Grain yield was studied in a collection of 220 Nordic barley lines at diverse locations in the Nordic countries. Two-row (2r) and six-row (6r) lines differed very significantly in reaction to the growing conditions within and between the two locations, Svalöv (in southern Sweden) and Højbakkegård (in Denmark). This difference was also highly significant at Viikki (in Finland), but not at Ås (in Norway) or between Viikki and Ås. Genotype \times location (GL) and genotype \times year (GY) variance components were used to estimate phenotypic yield stability by Shukla's stability variance (\sigma^{2}_{-}). Only 7 lines did not contribute significantly to GL- and GY-interactions, and their yield levels were 7–27\% lower than that of the highest yielding line (5057 kg/ha). Estimates of GL- and GY-stability parameters were not significantly correlated. Neither responsiveness, measured by the regression coefficient (b_{i}), nor phenotypic yield stability, measured by the deviations from regression (Tai's \lambda_{i}) were correlated with yield. Pedigree studies showed that both b_{i} and \sigma^{2}_{i} can be changed by recombination and/or induced mutations. Mixing of near isogenic lines with different resistance genes, and selection within a landrace, also resulted in changes in responsiveness. Recently released 2r-cultivars were more unstable than older 2r-cultivars revealed by positive correlation between the year of release and \lambda_{i}. Cultivars originating from southern Scandinavia were higher yielding than cultivars originating from the central or the northern regions of Scandinavia.

Keywords: genotype environment (GE) interaction; Hordeum vulgare; L., stability variance

Language: English

Document Type: Regular paper

Affiliations: 1: Agric. University of Norway, Department of Biotechnological Sciences/Genetics, POB 5040, N-1432 Ås, Norway 2: Agric. University of Norway, Department of Horticulture and Crop Sciences, POB 5022, N-1432 Ås, Norway

Publication date: 1996-01-01

• In this: publication
• By this: publisher
• In this Subject: Plant Culture ,  Botany
• By this author: Nurminiemi M. ;  Bj0slashrnstad Å. ;  Rognli O.A.

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