Environment of selection for grain yield in low fertilizer input barley

Sinebo, Woldeyesus; Gretzmacher, R.; Edelbauer, A.

doi:10.1016/s0378-4290(01)00207-6

Cited by 37 publications

(28 citation statements)

References 18 publications

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“…Although significant genotype · cropping system interaction was not observed for grain yield and other yield-related traits, broad sense heritability estimates were much higher for these traits under sole cropping compared to intercropping due to the higher error to genotypic variance under intercropping relative to sole cropping. This negative relationship between heritability estimates and stress intensity have been commonly encountered in selection experiments (Bänziger et al 1997;Sinebo et al 2002;Padi 2004). Selecting under sole cropping therefore would ensure rapid progress in grain yield improvement for intercropping conditions.…”

Section: Discussionmentioning

confidence: 99%

Genotype × environment interaction and yield stability in a cowpea-based cropping system

Padi¹

2007

Euphytica

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Twenty-four cowpea genotypes were evaluated under sole cropping or additive series intercropping with sorghum from 2004 to 2005 at four sites representative of the Guinea and Sudan savannah ecologies in Ghana. The aim was to determine whether cowpea breeding programs that emphasize selection under sole-crop conditions have the potential to produce cultivars that are effective under additive series intercropping. Genotype · cropping systems interaction was significant for days to 50% flowering but not for grain yield, biomass and other studied traits. Genotypic yield reaction to cropping systems indicated that bridging the yield gap between sole cropping and intercropping systems is best addressed by agronomic interventions that reduce stress on intercrop cowpea rather than by selecting for specifically adapted genotypes for intercropping. Significant genotype · environment interactions were observed for all traits when data was pooled over cropping systems. Partitioning of the genotype · environment interaction variance indicated that days to 50% flowering was dominated by heterogeneity of genotypic variance, whereas genotype · environment interactions for grain yield and biomass was mainly due to imperfect correlations. Large differences in genotypic yield stability were observed as estimated by the among-environment variance, regression of yield on the environmental index, Kataoka's index, and by partitioning of genotype · environment interaction sum of squares into components attributable to each genotype. The results suggest that in regions where genotype · environment interaction for yield frequently causes re-ranking across environments, genotypes with the least contribution to the interaction sum of squares are likely to be most productive. On the whole, the results support the contention that breeding under sole-crop conditions has the potential to produce cultivars effective under intercropping conditions.

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Section: Discussionmentioning

confidence: 99%

Genotype × environment interaction and yield stability in a cowpea-based cropping system

Padi¹

2007

Euphytica

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“…Important interactions were also found by Legzdina et al (2007) for yield in barley genotypes grown under organic and conventional conditions. Using the same approach in winter wheat, Brancourt-Hulmel et al (2005) as well as Sinebo et al (2002), found that the relative efficiency of indirect selection in conventional highinput conditions over the efficiency of direct selection in different low-input environments ranged from 0.35 to 0.99 in barley. It is also possible to make an a posteriori assessment of indirect versus direct selection: Ceccarelli and Grando (1991) evaluated more than 800 barley breeding lines in 8-10 environments classified as low yielding (LY) or high yielding (HY).…”

Section: Choice Of Selection Environments: Organic Versus Conventionalmentioning

confidence: 97%

Developments in breeding cereals for organic agriculture

et al. 2008

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The need for increased sustainability of performance in cereal varieties, particularly in organic agriculture (OA), is limited by the lack of varieties adapted to organic conditions. Here, the needs for breeding are reviewed in the context of three major marketing types, global, regional, local, in European OA. Currently, the effort is determined, partly, by the outcomes from trials that compare varieties under OA and CA (conventional agriculture) conditions. The differences are sufficiently large and important to warrant an increase in appropriate breeding. The wide range of environments within OA and between years, underlines the need to try to select for specific adaptation in target environments. The difficulty of doing so can be helped by decentralised breeding with farmer participation and the use of crops buffered by variety mixtures or populations. Varieties for OA need efficient nutrient uptake and use and weed competition. These and other characters need to be considered in relation to the OA cropping system over the whole rotation. Positive interactions are needed, such as early crop vigour for nutrient uptake, weed

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“…To maximize selection gains, breeding programmes targeting ORG or LI environments should include at least LI environments. The relative efficiency of indirect selection at HI levels was never shown to be more efficient than direct selection at LI (Ceccarelli et al 1992;Sinebo et al 2002;Brancourt-Hulmel et al 2005). Heritabilities and relative efficiency of direct versus indirect selection vary greatly with the pairs of environments.…”

Section: Selection Strategymentioning

confidence: 99%

Breeding for organic agriculture: the example of winter wheat in Austria

Löschenberger¹,

Fleck²,

Grausgruber

et al. 2008

Euphytica

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Breeding for organic agriculture (BFOA) is a strategy for a commercial breeding company based on the exploitation of the frequently observed high correlation for many traits between conventional, low input (LI) and organic agriculture (ORG). Indirect selection under LI can be useful to roughly divide the germplasm into the genotypes better adapted to high input and those better adapted to LI or ORG conditions. BFOA is an evolving process, in which two methods are currently applied: early generations are either selected following the pedigree system under LI, or grown as bulk populations on ORG fields. In the latter case the system switches to LI after individual ear selection under ORG conditions. In both methods, the first replicated yield trial is grown parallel under ORG and LI. Subsequently, the genotypes are grouped into conventional or ORG advanced trial series. The BFOA strategy allows that the larger genetic variability of both the organic and conventional gene pool can be exploited in the selection for ORG. Hitherto, seven winter wheat varieties were released in Austria after exclusive organic VCU testing.

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Environment of selection for grain yield in low fertilizer input barley

Cited by 37 publications

References 18 publications

Genotype × environment interaction and yield stability in a cowpea-based cropping system

Genotype × environment interaction and yield stability in a cowpea-based cropping system

Developments in breeding cereals for organic agriculture

Breeding for organic agriculture: the example of winter wheat in Austria

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