| Autor: |
Hatzig SV; Department of Plant Breeding, Justus Liebig University Giessen, Germany., Frisch M; Department of Biometry and Population Genetics, Justus Liebig University Giessen, Germany., Breuer F; KWS SAAT AG Einbeck, Germany., Nesi N; Institute for Genetics, Environment and Plant Protection, INRA Le Rheu, France., Ducournau S; Groupe d'Etude et de contrôle des Variétés Et des Semences Beaucouzé, France., Wagner MH; Groupe d'Etude et de contrôle des Variétés Et des Semences Beaucouzé, France., Leckband G; NPZ Innovation GmbH Holtsee, Germany., Abbadi A; NPZ Innovation GmbH Holtsee, Germany., Snowdon RJ; Department of Plant Breeding, Justus Liebig University Giessen, Germany. |
| Abstrakt: |
Rapid and uniform seed germination is a crucial prerequisite for crop establishment and high yield levels in crop production. A disclosure of genetic factors contributing to adequate seed vigor would help to further increase yield potential and stability. Here we carried out a genome-wide association study in order to define genomic regions influencing seed germination and early seedling growth in oilseed rape (Brassica napus L.). A population of 248 genetically diverse winter-type B. napus accessions was genotyped with the Brassica 60k SNP Illumina genotyping array. Automated high-throughput in vitro phenotyping provided extensive data for multiple traits related to germination and early vigor, such as germination speed, absolute germination rate and radicle elongation. The data obtained indicate that seed germination and radicle growth are strongly environmentally dependent, but could nevertheless be substantially improved by genomic-based breeding. Conditions during seed production and storage were shown to have a profound effect on seed vigor, and a variable manifestation of seed dormancy appears to contribute to differences in germination performance in B. napus. Several promising positional and functional candidate genes could be identified within the genomic regions associated with germination speed, absolute germination rate, radicle growth and thousand seed weight. These include B. napus orthologs of the Arabidopsis thaliana genes SNOWY COTYLEDON 1 (SCO1), ARABIDOPSIS TWO-COMPONENT RESPONSE REGULATOR (ARR4), and ARGINYL-t-RNA PROTEIN TRANSFERASE 1 (ATE1), which have been shown previously to play a role in seed germination and seedling growth in A. thaliana. |
