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Role of Light Quality and Temperature on Pitted Morningglory (Ipomoea lacunosa) Germination with After-Ripening

Published online by Cambridge University Press:  20 January 2017

Jason K. Norsworthy  and
Marcos J. Oliveira
Jason K. Norsworthy*
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704
Marcos J. Oliveira
Affiliation:
Department of Entomology, Soils, and Plants Sciences, Clemson University, Clemson, SC 29634
*
Corresponding author's E-mail: [email protected]
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Abstract

Pitted morningglory seed were collected in the fall of 2003 from Blackville, SC, and 2004 from Pendleton, SC, to assess the effect of After-Ripening and burial on light and temperature requirements for germination. Pitted morningglory germination was evaluated over a 12-mo period after maturation. Germination was neither stimulated by red light or inhibited by far-red light, nor was it reversible by red or far-red light. Light was not essential for germination of buried seed. Direct exposure to sunlight prevented germination of recently mature seed, but not once seed had sufficiently after-ripened. Pitted morningglory was capable of germination in darkness over a wide range of constant and fluctuating temperatures immediately after maturation. Germination in response to temperature varied with time of year after maturation, with the population from Pendleton having increased germination in May. Thermal fluctuations increased germination of both populations at suboptimal temperatures. Thermal amplitude regulation of germination varied over time and appeared to play a more important role in germination of after-ripened seed than recently mature ones. The ecological significance of changes in germination requirements with After-Ripening is discussed.

Keywords

Pitted morningglory, Ipomoea lacunosa L. IPOLALight qualityshadingthermal amplitudeweed emergence
Type
Research Article
Information
Weed Science , Volume 55 , Issue 2 , April 2007 , pp. 111 - 118
Copyright
Copyright © Weed Science Society of America 

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