Data/hora: 13/06/2024 07:23:16

Provedor de dados: | 21
País: | Germany
Título: | Importance of appropriate selection environments for breeding maize adapted to organic farming systems
Autores: | Messmer, Monika M.; Burger, Henriette; Schmidt, Walter; Geiger, Hartwig H.
Data: | 2010
Ano: | 2010
Palavras-chave: | Cereals; Pulses and oilseeds Breeding; Genetics and propagation.
Resumo: | Organic farming systems, characterized by special attention to soil fertility, recycling techniques and low external inputs, gained increased significance in recent years. As a consequence, there is a growing demand for varieties adapted to organic and/or low input farming. The objectives of the present study were to (i) compare the testcross performance of segregating maize (Zea mays) populations under established organic (OF) and conventional farming (CF) systems, (ii) determine quantitative genetic parameters decisive for the selection response under OF vs CF conditions, and (iii) draw conclusions for breeding new varieties optimally adapted to OF. Testcross performance of four different material groups of preselected lines (90 lines per group) derived from early European breeding material was assessed under OF and CF in three different geographic regions in Germany in 2008. Grain yields under OF were 3 to 18% lower than under CF in the individual experiments depending on the test region and, to a lesser extent, on the genetic material. On average, grain dry matter yield under OF was 1077 g m-2 compared to 1186 g m-2 under CF. Phenotypic correlations between OF and CF were small or moderate for grain yield in each of the four material groups (0.22 to 0.45), while strong and highly significant correlations were found for dry matter content (0.89 to 0.94). Genotypes with top grain yields under OF often did not show this superiority under CF and vice versa. Despite considerable heterogeneity of the OF test sites, the heritability for grain yield was in the same order of magnitude under OF and CF. It is concluded that test sites managed by OF are indispensable for making maximum progress in developing maize varieties for these conditions.
Tipo: | Book chapter
Idioma: | Inglês

Identificador:

http://orgprints.org/17864/1/messmer%2Detal%2D2009%2Dtagung%2Dvereinigung%2Dpflanzenz%C3%BCchter%2Dsaatgutkaufleute%2D%C3%B6sterreichs.pdf

Messmer, Monika M.; Burger, Henriette; Schmidt, Walter and Geiger, Hartwig H. (2010) Importance of appropriate selection environments for breeding maize adapted to organic farming systems. In: Tagungsband der 60. Jahrestagung der Vereinigung der Pflanzenzüchter und Saatgutkaufleute Österreichs. Züchtung und Genressourcen gegen abiotische Stressfaktoren - Markergestützte Selektion in der Praxis. Höhere Bundeslehr- und Forschungsanstalt für Landwirtschaft Raumberg-Gumpenstein, A-Irdning, pp. 49-51.

urn:ISSN:2072-9596

urn:ISBN:978-3-902559-37-1

Editor: | Höhere Bundeslehr- und Forschungsanstalt für Landwirtschaft Raumberg-Gumpenstein
Relação: | http://orgprints.org/17864/
Formato: | application/pdf