ISHS Acta Horticulturae 459: International Symposium Brassica 97, Xth Crucifer Genetics Workshop
BREAKING THE LINKAGE BETWEEN FREEZING TOLERANCE AND VERNALIZATION IN WINTER BRASSICA NAPUS |
| Authors: | Glen P. Hawkins, M. N. Konschuh, Thomas J. Kubik, Anne M. Johnson-Flanagan |
| Keywords: | Brassica, vernalization, freezing tolerant, yield and maturity |
| Abstract:
Winter Brassicas must be exposed to extended periods of low temperature to flower and set seed in a reasonable time frame. This low temperature exposure also results in the acquisition of freezing tolerance. To investigate the relationship between freezing tolerance and vernalization, homozygous microspore-derived lines were developed from reciprocal crosses between two winter cultivars of Brassica napus, Cascade and Rebel. Analysis of 80 isogenic DH lines identified a line, VERN- which no longer had a vernalization requirement. Genetic analysis of VERN- revealed a polymorphism. Complementation analysis of an F2 backcross population, suggested a single recessive locus. Despite the loss of vernalization requirement, VERN- retains a high degree of both inherent and acclimation-specific freezing tolerance. The implications of this in terms of cultivar development in addition to understanding the relationship between freezing tolerance and vernalization will be discussed. | |
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