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Development. 2019 Feb 15;146(3). pii: dev172684. doi: 10.1242/dev.172684.

VERNALIZATION1 controls developmental responses of winter wheat under high ambient temperatures.

Author information

1
Department of Crop Genetics, John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK laura.dixon@jic.ac.uk.
2
Department of Molecular Breeding, Centre for Agricultural Research, Hungarian Academy of Sciences, H-2462, Martonvásár, Hungary.
3
Department of Crop Genetics, John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK.
4
Department of Cell and Developmental Biology, John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK.
5
Université Clermont Auvergne, INRA, UMR 1095 GDEC (Genetic, Diversity and Ecophysiology of Cereals), 63000 Clermont Ferrand, France.

Abstract

Low temperatures are required to regulate the transition from vegetative to reproductive growth via a pathway called vernalization. In wheat, vernalization predominantly involves the cold upregulation of the floral activator VERNALIZATION1 (VRN1). Here, we have used an extreme vernalization response, identified through studying ambient temperature responses, to reveal the complexity of temperature inputs into VRN-A1, with allelic inter-copy variation at a gene expansion of VRN-A1 modulating these effects. We find that the repressors of the reproductive transition, VERNALIZATION2 (VRN2) and ODDSOC2, are re-activated when plants experience high temperatures during and after vernalization. In addition, this re-activation is regulated by photoperiod for VRN2 but was independent of photoperiod for ODDSOC2 We also find this warm temperature interruption affects flowering time and floret number and is stage specific. This research highlights the important balance between floral activators and repressors in coordinating the response of a plant to temperature, and that the absence of warmth is essential for the completion of vernalization. This knowledge can be used to develop agricultural germplasm with more predictable vernalization responses that will be more resilient to variable growth temperatures.

KEYWORDS:

Flowering; Temperature; Wheat

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