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Plant Physiology 54:817-820 (1974)
© 1974 American Society of Plant Biologists

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Articles

Permeability of Seed Coats to Water as Related to Drying Conditions and Metabolism of Phenolics 1

Irith Marbach and Alfred M. Mayer

a Department of Botany, The Hebrew University, Jerusalem, Israel

The seed coat of Pisum elatius is normally impermeable to water. When seeds are dried in the absence of oxygen their coats are totally permeable to water. Structural differences are observed between permeable and impermeable seed coats. In the genus Pisum, species with normally impermeable seed coats have a high content of phenolics and of catechol oxidase, while seed coats of P. sativum contain very little catechol oxidase and have a very low content of phenolics. Such differences are not noted in the cotyledons. We hypothesized that during dehydration of seeds, oxidation of phenolic compounds in seed coats through catalysis of catechol oxidase in presence of O2 might render the seed coats impermeable to water.

1 The untimely death of Ernest Sondheiner will be felt by all plant biochemists who are deprived not only of an outstanding contributor but also of a personal friend. This paper is dedicated to his memory and in appreciation of our close contacts and common interests.




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Copyright © 1974 by the American Society of Plant Biologists