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GrainGenes Reference Report: TAG-105-113

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Reference	TAG-105-113
Title	Genomic regions controlling vernalization and photoperiod responses in oat
Journal	Theoretical and Applied Genetics
Year	2002
Volume	105
Pages	113-126
Author	Holland JB Portyanko VA Hoffman DL Lee M
Abstract	Summary: Oat genotypes vary for photoperiod and vernalization responses. Vernalization often promotes earlier flowering in fall-sown but not spring-sown cultivars. Longer photoperiods also promote earlier flowering, and the response to longer photoperiods tends to be greater in cultivars from higher latitudes. To investigate the genetic basis of photoperiod and vernalization responses in oat, we mapped QTLs for flowering time under four combinations of photoperiod and vernalization treatments in the Ogle x TAM O-301 mapping population in growth chambers. We also mapped QTLs for flowering time in early spring and late-spring field plantings to determine the genetic basis of response to early spring planting in oat. Three major flowering-time QTLs (on linkage groups OT8, OT31 and OT32) were detected in most conditions. QTLs with smaller effects on flowering were less-consistently observed among treatments. Both vernalization-sensitive and insensitive QTLs were discovered. Longer photoperiod or vernalization alone tended to decrease the effects of flowering-time QTLs. Applied together, longer photoperiod and vernalization interacted synergistically, often on the same genomic regions. Earlier spring planting conferred an attenuated vernalization treatment on seeds. The major flowering-time QTLs mapped in this study matched those mapped previously in the Kanota x Ogle oat mapping population. Between these two studies, we found a concordance of flowering-time QTLs, segregation distortion, and complex genetic linkages. These effects may all be related to chromosomal rearrangements in hexaploid oat. Comparative mapping between oat and other grasses will facilitate molecular analysis of vernalization response in oat
External Databases	http://link.springer.de/link/service/journals/00122/contents/01/00845/
Map Data	Oat-2002-OxT-QTL
QTL	QEFLD.2002-OxT_2 [ Show all 50 ]
Keyword	[ Hide all but 1 of 39 ] arabidopsis avena chambers chromosomal rearrangements combinations comparative mapping complexes distortion field flowering flowering time flowering-time genetic linkage genetic-basis genetic-linkage growth hexaploid hexaploid oat kanota latitude linkage linkage group linkage groups maize mapping molecular analysis oat photoperiod photoperiod response photoperiod-response population quantitative trait loci rearrangements responses segregation segregation distortion spring vernalization vernalization response

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