Seed development in Phaseolus vulgaris L. cv Seminole. II. Precocious germination in late maturation

Seeds of Phaseolus vulgaris L. cv Seminole in late maturation phase germinated precociously in vitro. Germination occurred in the absence of free water after 5 days but within 24 to 48 hours in contact with water. Excised axes germinated within 12 hours and embryos by 48 hours only if supplied with...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1990-07, Vol.93 (3), p.1089-1093
Main Authors: Fountain, D.W. (Massey University, Palmerston North, New Zealand), Outred, H.A
Format: Article
Language:English
Subjects:
Biological and medical sciences
Catabolism
CONTENIDO DE HUMEDAD
Cotyledons
DESARROLLO ESTACIONAL
Development and Growth Regulation
DEVELOPPEMENT SAISONNIER
Embryos
ETAPAS DE DESARROLLO DE LA PLANTA
ETHYLENE
ETILENO
Fundamental and applied biological sciences. Psychology
GERMINACION
GERMINATION
Germination and dormancy
GRAINE
Leaching
MADURACION
MADURACION PRECOZ
MANNITOL
MATURATION
PHASEOLUS VULGARIS
Plant physiology and development
Plants
PRECOCITE
PRESION OSMOTICA
PRESSION OSMOTIQUE
Seed development
Seed pods
Seeds
SEMILLA
STADE DE DEVELOPPEMENT VEGETAL
TENEUR EN EAU
Testa
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Summary:Seeds of Phaseolus vulgaris L. cv Seminole in late maturation phase germinated precociously in vitro. Germination occurred in the absence of free water after 5 days but within 24 to 48 hours in contact with water. Excised axes germinated within 12 hours and embryos by 48 hours only if supplied with water. Ethylene accelerated the germination of seeds and embryos irrespective of water availability. There was no effect of ethylene on the rate of axis germination. Ethylene was equally effective within the range 0.5 to 1000 parts per million and 1 hour exposure was fully effective. Induction of precocious germination in vivo was observed by manipulating water content inside pods or by ethylene injection, whether pods were attached to the parent plant or not. These results demonstrate the importance of endogenous regulation of water supply in suppressing precocious germination. Ethylene is identified as a powerful antagonist to the natural control
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.93.3.1089