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Pitted morningglory (Ipomoea lacunosa) germination and emergence as affected by environmental factors and seeding depth

Published online by Cambridge University Press:  20 January 2017

Marcos J. Oliveira  and
Jason K. Norsworthy
Marcos J. Oliveira
Affiliation:
Department of Entomology, Soils, and Plant Sciences, Clemson University, 277 Poole Agricultural Center, Clemson, SC 29634
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Abstract

Laboratory and greenhouse experiments were conducted to determine the effect of light, temperature, solution pH, solution osmotic potential, and oxygen concentration on pitted morningglory germination and radicle plus hypocotyl elongation, and seeding depth on its subsequent emergence. Daily exposure of seed to natural light resulted in lower germination than in darkness, whereas germination was not influenced by brief exposure to red or far-red light. Germination occurred over a wide range of constant temperatures, from 7.5 to 52.5 C, with optimum germination between 20 and 25 C. Germination occurred at solution pH range of 3 to 10 and was optimal from pH 6 to 8. Radicle plus hypocotyl elongation was influenced by the interaction of temperature and solution pH. A combination of acidic medium (pH 6) and high temperature (30 C) resulted in the greatest radicle plus hypocotyl length of 7.6 cm after a 7-d incubation. Germination and radicle plus hypocotyl elongation, averaged over the 15 and 30 C temperature, decreased with increasing moisture stress, with less than 3% normalized germination at −1.0 MPa. Germination was 29, 40, and 51% at 2, 10, and 20% oxygen, respectively, averaged over 15 and 30 C. Germination of seed lying on the soil surface covered with filter paper or without any cover was similar, averaging 64%. Normalized emergence, relative to germination on the soil surface, decreased with increasing burial depth to 4% emergence at 10 cm, with a mean emergence depth of 4.1 cm, averaged across two soil types.

Keywords

Pitted morningglory, Ipomoea lacunosa L. IPOLAEmergence depthgerminationmoisture stressoxygensolution pHtemperatureweed biology
Type
Research Article
Information
Weed Science , Volume 54 , Issue 5 , October 2006 , pp. 910 - 916
Copyright
Copyright © Weed Science Society of America 

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