Journal
PLANT BREEDING
Volume 125, Issue 5, Pages 468-472Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1439-0523.2006.01266.x
Keywords
Hordeum vulgare; Vrn-H2; vernalization; photoperiod; reproductive fitness
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To determine the effect of Vrn-H2 locus on plant developmental and agronomic traits, detailed controlled environment tests involving a factorial set of vernalization and photoperiod treatments were carried out using doubled haploid lines developed from a facultative (Vrn-H2(-)) x winter (Vrn-H2(+)) barley cross. The allele phase at the Vrn-H2 locus influenced heading date as well as the developmental and agronomic traits. The performance of Vrn-H2(+) lines was significantly influenced by vernalization: reproductive fitness traits showed significant decreases without vernalization. However, the effects of alleles at the Vrn-H2 locus extended beyond simple satisfaction of the vernalization requirement. Vrn-H2(+) lines showed increased reproductive fitness compared with Vrn-H2(-) lines when vernalization was followed by a long photoperiod. The responses of the two Vrn-H2 allele classes to photoperiod duration were quite different in terms of heading date, developmental and agronomic traits. These results suggest that alleles at the Vrn-H2 locus - and/or tightly linked gene(s) - respond primarily to the exogenous signal of vernalization (temperature), but when the vernalization requirement has been fulfilled, they also respond to photoperiod duration.
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