Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 55:928-931 (1975)
© 1975 American Society of Plant Biologists

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Articles

Polysome Formation in Light-sensitive Common Purslane Seeds

Bonnie J. Reger, Grant H. Egley and Charles R. Swanson

1 United States Department of Agriculture, Agricultural Research Service, Southern Weed Science Laboratory, 1 Stoneville, Mississippi 38776

Common purslane (Portulaca oleracea L.) seeds show light-controlled dormancy. Ribosome profiles from dark-incubated seeds consist of 22 to 26% polysomes. Light induces germination and stimulates polysome formation during the 12-hour lag period preceding radicle protrusion. Polysome levels increase to 29, 35, and 41% with exposure to 3, 6, and 9 hours of light, respectively. Although polysomes form on imbibition in the dark, 6 hours of light stimulates a significant increase in polysome formation which is probably related to early stages of radicle elongation.

1 Mississippi Agricultural and Forestry Experiment Station co-operating.






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