Effect of the Hope FT-B1 Allele on wheat heading time and yield components

Authors
Nitcher, Rebecca; Pearce, Stephen; Tranquilli, Gabriela; Xiaoqin, Zhang; Dubcovsky, Jorge
Publication Year
2014
Language
English
Format
article
Status
Published version
Description
Precise regulation of flowering time is critical for plant reproductive success and, in cereals, to maximize grain yields. Seasonal cues including temperature and day length are integrated to regulate the timing of flowering. In temperate cereals, extended periods of cold (vernalization) release the repression of FLOWERING LOCUS T1 (FT1), which is upregulated in the leaves in response to inductive long-day photoperiods. FT1 is a homolog of rice HD3a, which encodes a protein transported from leaves to the shoot apical meristem to induce flowering. A rare FT-B1 allele from the wheat variety “Hope” has been previously shown to be associated with an early flowering phenotype under long-day photoperiods. Here, we demonstrate that the Hope FT-B1 allele accelerates flowering even under short days, and that it is epistatic to the VERNALIZATION 1 (VRN1) gene. On average, the introgression of Hope FT-B1 into 6 genetic backgrounds resulted in 2.6 days acceleration of flowering (P < 0.0001) and 4.1% increase in spike weight (P = 0.0093), although in one variety, it was associated with a decrease in spike weight. These results suggest that the Hope FT-B1 allele could be useful in wheat breeding programs to subtly accelerate floral development and increase adaptation to changing environments.
Fil: Nitcher, Rebecca. University of California. Department of Plant Sciences; Estados Unidos
Fil: Pearce, Stephen. University of California. Department of Plant Sciences; Estados Unidos
Fil: Tranquilli, Gabriela. University of California. Department of Plant Sciences; Estados Unidos. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos; Argentina
Fil: Xiaoqin, Zhang. University of California. Department of Plant Sciences; Estados Unidos
Fil: Dubcovsky, Jorge. University of California. Department of Plant Sciences; Estados Unidos. Howard Hughes Medical Institute; Estados Unidos
Source
Journal of Heredity 105 (5) : 666–675 (September 2014)
Subject
Alelos
Trigo
Caracteres de Rendimiento
Espigueo
Alleles
Wheat
Yield Components
Heading
Access level
Open access
License
Repository
INTA Digital (INTA)
Institution
Instituto Nacional de Tecnología Agropecuaria
OAI Identifier
oai:localhost:20.500.12123/1714