Plant Physiol.
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Plant Physiology 93:1089-1093 (1990)
© 1990 American Society of Plant Biologists

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Development and Growth Regulation

Seed Development in Phaseolus vulgaris L. cv Seminole

II. Precocious Germination in Late Maturation

David W. Fountain and Heather A. Outred

Botany and Zoology Department, Massey University, Palmerston North, New Zealand

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.




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V. Hershkovitz, H. Friedman, E. E. Goldschmidt, and E. Pesis
The role of the embryo and ethylene in avocado fruit mesocarp discoloration
J. Exp. Bot., March 1, 2009; 60(3): 791 - 799.
[Abstract] [Full Text] [PDF]


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Copyright © 1990 by the American Society of Plant Biologists