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Effects of stratification, temperature, and oxygen on woolly cupgrass (Eriochloa villosa) seed dormancy

Published online by Cambridge University Press:  12 June 2017

Iliya A. Bello ,
Harlene Hatterman-Valenti  and
Micheal D. K. Owen
Iliya A. Bello
Affiliation:
Agronomy Department, Iowa State University, Ames, IA 50011
Harlene Hatterman-Valenti
Affiliation:
Agronomy Department, Iowa State University, Ames, IA 50011
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Abstract

Laboratory and field experiments were conducted to determine the effects of temperature, oxygen, and seed burial depth on woolly cupgrass seed dormancy. Woolly cupgrass seeds at physiological maturity are innately dormant. Stratifying these seeds at 5 C for 8 wk increased germination to greater than 90%, regardless of the germination temperature. Alternating the germination temperature hastened germination by 2 wk, while seedcoat removal hastened germination by another 4 wk. Low oxygen concentration was more detrimental to seed germination when seeds were subjected to constant temperatures in comparison to alternating temperatures. Oxygen concentration did not affect seed germination when seeds were placed in an alternating 15/25 C regime. Seed germination was approximately 15% less when seeds were stratified for 2 wk and subjected to oxygen concentrations below the ambient oxygen concentration, whereas this decrease was present only at the 8% oxygen concentration when seeds were stratified 4 wk. In the field, the stratification requirement was satisfied by early December for the study year. Seeds remaining on the soil surface overcame dormancy sooner than seeds buried 2 or 4 cm.

Keywords

Woolly cupgrass, Eriochloa villosa [Thunb.] Kunth ERBVISeed burialseed germinationERBVI
Type
Weed Biology and Ecology
Information
Weed Science , Volume 46 , Issue 5 , October 1998 , pp. 526 - 529
Copyright
Copyright © 1998 by the Weed Science Society of America 

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Footnotes

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