Articles
BREAKING THE LINKAGE BETWEEN FREEZING TOLERANCE AND VERNALIZATION IN WINTER BRASSICA NAPUS
Article number
459_47
Pages
397 – 402
Language
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.
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.
Authors
Glen P. Hawkins, M. N. Konschuh, Thomas J. Kubik, Anne M. Johnson-Flanagan
Keywords
Brassica, vernalization, freezing tolerant, yield and maturity
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