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Hormone physiology of pea mutants prevented from flowering by mutations gi or veg1


Beveridge, CA and Batge, SL and Ross, JJ and Murfet, IC, Hormone physiology of pea mutants prevented from flowering by mutations gi or veg1, Physiologia Plantarum, 113, (2) pp. 285-291. ISSN 0031-9317 (2001) [Refereed Article]

DOI: doi:10.1034/j.1399-3054.2001.1130217.x


The veg1 (vegetative) mutant in pea (Pisum sativum L.) does not flower under any circumstances and gi (gigas) mutants remain vegetative under certain conditions, gi plants are deficient in production of floral stimulus, whereas veg1 plants lack a response to floral stimulus. During long days in particular, these non-flowering mutant plants eventually enter a stable compact phase characterised by a large reduction in internode length, small leaves and growth of lateral shoots from the upper-stem (aerial) nodes. The first-order laterals in turn produce second-order laterals and so on in a reiterative pattern. The apical bud is reduced in size but continues active growth. Endogenous hormone measurements and gibberellin application studies with gi-1, gi-2 and veg1 plants indicate that a reduction in gibberellin and perhaps indole-3-acetic acid level may account, at least partially, for the compact aerial shoot phenotype. In the gi-1 mutant, the compact phenotype is rescued by transfer from a 24- to an 8-h photoperiod. We propose that in plants where flowering is prevented by a lack of floral stimulus or an inability to respond, the large reduction in photoperiod gene activity during long days may lead to a reduction in apical sink strength that is manifest in an altered hormone profile and weak apical dominance.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the environmental sciences
UTAS Author:Batge, SL (Ms Shona Lee Batge)
UTAS Author:Ross, JJ (Associate Professor John Ross)
UTAS Author:Murfet, IC (Professor Ian Murfet)
ID Code:22418
Year Published:2001
Web of Science® Times Cited:3
Deposited By:Plant Science
Deposited On:2001-08-01
Last Modified:2011-11-24

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