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Physiological Basis of Seed Dormancy in Woolly Cupgrass (Eriochloa villosa [Thunb.] Kunth.)

Published online by Cambridge University Press:  12 June 2017

Harlene Hatterman-Valenti ,
Iliya A. Bello  and
Micheal D. K. Owen
Harlene Hatterman-Valenti
Affiliation:
Dep. Agron., Iowa State Univ., Ames, IA 50011
Iliya A. Bello
Affiliation:
Dep. Agron., Iowa State Univ., Ames, IA 50011
Micheal D. K. Owen
Affiliation:
Dep. Agron., Iowa State Univ., Ames, IA 50011
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Abstract

Laboratory studies were conducted to determine the effect of seed coat on woolly cupgrass seed moisture and oxygen uptake, and to determine if water-soluble growth inhibitors are present in the seed. Intact dormant seeds did not respond to any temperature regime or to oxygen concentrations above atmospheric level. Dehulling increased germination of dormant seed to about 85%. Oxygen concentrations above atmospheric level increased germination of partially dehulled (1/4 distal end of the seed dehulled) seeds an additional 10%. Oxygen uptake by dehulled dormant and intact nondormant seeds was greater than intact dormant seeds. Leaching intact dormant seeds did not promote germination, nor did the leachate inhibit germination of nondormant seeds. Embryos excised from dormant seeds germinated under laboratory conditions. Results from this study suggest that the woolly cupgrass seed coat may inhibit germination by controlling oxygen availability to the embryo.

Keywords

Woolly cupgrass, Eriochloa villosa [Thunb.] Kunth. ♯ ERBVISeed dormancyimbibitionrespirationseed hullsembryo excisionERBVI
Type
Weed Biology and Ecology
Information
Weed Science , Volume 44 , Issue 1 , March 1996 , pp. 87 - 90
Copyright
Copyright © 1996 by the Weed Science Society of America 

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