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Abstract

The eg1 (egetatie) mutant in pea (Pisum satium L.) does growth. Endogenous hormone measurements and gibberellin
not flower under any circumstances and gi (gigas) mutants application studies with gi-1, gi-2 and eg1 plants indicate
remain vegetative under certain conditions. gi plants are defi- that a reduction in gibberellin and perhaps indole-3-acetic acid
cient in production of floral stimulus, whereas eg1 plants lack level may account, at least partially, for the compact aerial
a response to floral stimulus. During long days in particular, shoot phenotype. In the gi-1 mutant, the compact phenotype is
these non-flowering mutant plants eventually enter a stable rescued by transfer from a 24- to an 8-h photoperiod. We
compact phase characterised by a large reduction in internode propose that in plants where flowering is prevented by a lack
length, small leaves and growth of lateral shoots from the of floral stimulus or an inability to respond, the large reducupper-
stem (aerial) nodes. The first-order laterals in turn tion in photoperiod gene activity during long days may lead to
produce second-order laterals and so on in a reiterative pat- a reduction in apical sink strength that is manifest in an
tern. The apical bud is reduced in size but continues active altered hormone profile and weak apical dominance.

Item Type:	Article
Authors/Creators:	Beveridge, CA and Batge, SL and Ross, JJ and Murfet, IC
Journal or Publication Title:	Physiologia Plantarum
ISSN:	0031-9317
DOI / ID Number:	10.1034/j.1399-3054.2001.1130217.x
Additional Information:	Copyright 2001 Physiologia Plantarum
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