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Characterization of the maintained vegetative phase deletions from diploid wheat and their effect on VRN2 and FT transcript levels

Content Provider	Springer Nature Link
Author	Distelfeld, Assaf Dubcovsky, Jorge
Copyright Year	2010
Abstract	Allelic differences at the VRN1 (AP1/CAL/FRU), VRN2 (ZCCT) and VRN3 (FT) vernalization genes affect flowering time in wheat. The two maintained vegetative phase (mvp) mutants from Triticum monococcum L., previously reported as carrying a single gene (VRN1) deletion, are incapable of flowering. In this study, we show that both mvp lines have larger deletions that include the genes AGLG1, CYS, PHYC, VRN1 and possibly others. The original mvp deletions were generated in lines that lack the VRN2 gene. Therefore, to study the effect of the mvp deletions on the regulation of VRN2 we generated populations segregating for both genes simultaneously. The two mvp deletions co-segregated with the non-flowering phenotype, but surprisingly, the lines homozygous for the mvp mutations showed reduced transcript levels of both VRN2 and FT relative to the wild type. The VRN1 deletion is an unlikely cause of the down-regulation of VRN2 since VRN2 transcript levels are higher in the fall, before VRN1 is expressed, and are down-regulated by VRN1. Since both VRN2 and FT are regulated by light and photoperiod, their down-regulation in the mvp mutants might be related to the deletion of the PHYC photoreceptor. However, alternative hypotheses including combinations of other genes deleted in the mvp mutants cannot be ruled out. Until the specific gene(s) responsible for the down-regulation of VRN2 and FT and the non-flowering phenotype are precisely identified, it is premature to use these results to postulate alternative flowering models.
Starting Page	223
Ending Page	232
Page Count	10
File Format	PDF
ISSN	16174615
Journal	Molecular and General Genetics MGG
Volume Number	283
Issue Number	3
e-ISSN	16174623
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-01-09
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Flowering Wheat Vernalization Phytochrome VRN1 Animal Genetics and Genomics Microbial Genetics and Genomics Cell Biology Plant Genetics & Genomics Biochemistry
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Molecular Biology

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