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The Pea GIGAS Gene Is a FLOWERING LOCUS T Homolog Necessary for Graft-Transmissible Specification of Flowering but Not for Responsiveness to Photoperiod


Hecht, V and Laurie, RE and Vander Schoor, JK and Ridge, S and Knowles, CL and Liew, LC and Sussmilch, FC and Murfet, IC and Macknight, RC and Weller, JL, The Pea GIGAS Gene Is a FLOWERING LOCUS T Homolog Necessary for Graft-Transmissible Specification of Flowering but Not for Responsiveness to Photoperiod, The Plant Cell, 23, (1) pp. 147-161. ISSN 1040-4651 (2011) [Refereed Article]

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Copyright Statement

Copyright 2011 by the American Society of Plant Biologists

DOI: doi:10.1105/tpc.110.081042


Garden pea (Pisum sativum) was prominent in early studies investigating the genetic control of flowering and the role of mobile flowering signals. In view of recent evidence that genes in the FLOWERING LOCUS T (FT) family play an important role in generating mobile flowering signals, we isolated the FT gene family in pea and examined the regulation and function of its members. Comparison with Medicago truncatula and soybean (Glycine max) provides evidence of three ancient subclades (FTa, FTb, and FTc) likely to be common to most crop and model legumes. Pea FT genes show distinctly different expression patterns with respect to developmental timing, tissue specificity, and response to photoperiod and differ in their activity in transgenic Arabidopsis thaliana, suggesting they may have different functions. We show that the pea FTa1 gene corresponds to the GIGAS locus, which is essential for flowering under long-day conditions and promotes flowering under short-day conditions but is not required for photoperiod responsiveness. Grafting, expression, and double mutant analyses show that GIGAS/FTa1 regulates a mobile flowering stimulus but also provide clear evidence for a second mobile flowering stimulus that is correlated with expression of FTb2 in leaf tissue. These results suggest that induction of flowering by photoperiod in pea results from interactions among several members of a diversified FT family.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Grains and seeds
Objective Field:Grain legumes
UTAS Author:Hecht, V (Dr Valerie Hecht)
UTAS Author:Vander Schoor, JK (Mrs Jacqueline Vander Schoor)
UTAS Author:Ridge, S (Mr Stephen Ridge)
UTAS Author:Knowles, CL (Dr Claire Knowles)
UTAS Author:Liew, LC (Miss Lim Chee Liew)
UTAS Author:Sussmilch, FC (Dr Frances Sussmilch)
UTAS Author:Murfet, IC (Professor Ian Murfet)
UTAS Author:Weller, JL (Associate Professor Jim Weller)
ID Code:72218
Year Published:2011
Web of Science® Times Cited:130
Deposited By:Plant Science
Deposited On:2011-08-24
Last Modified:2012-04-16
Downloads:2 View Download Statistics

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