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Seed Viability and Dormancy of 17 Weed Species After 21 Months in Alaska

Published online by Cambridge University Press:  12 June 2017

Jeffery S. Conn  and
Martha L. Farris
Jeffery S. Conn
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv.
Martha L. Farris
Affiliation:
Univ. Alaska, Fairbanks, AK 99775
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Abstract

A 50-yr buried-seed study was initiated at Fairbanks, AK, in 1984. Seed of 17 weed species important in Alaskan agriculture were collected and buried 2 and 15 cm deep. Seed viability was determined initially and after recovery from the soil through a combination of germination tests and 2,3,5-triphenyltetrazolium chloride (TTC) treatments. Seed exhumed at 9 and 21 months were tested for viability and dormancy. Burial depth had a significant effect on seed longevity of corn spurry (Spergula arvensis L. # SPRAR), wild oats (Avena fatua L. # AVEFA), pineappleweed [Matricaria matricarioides (Less.) C. L. Porter # MATMT], and bluejoint reedgrass [Calamagrostis canadensis (Michx.) Nutt.]. Viability was higher for seed buried at 15 than at 2 cm. Viability of shepherdspurse [Capsella bursapastoris (L.) Medik. #CAPBP] and pineappleweed seed did not decrease significantly over the 21-month burial period. In contrast, seed viability of wild buckwheat (Polygonum convolvulus L. # POLCO), common hempnettle (Galeopsis tetrahit L. # GAETE), wild oats, quackgrass [Agropyron repens (L.) Beauv. # AGRRE], and foxtail barley (Hordeum jubatum L. # HORJU) was less than 11% at the end of 21 months. There was no significant relationship between initial seed dormancy and viability after 21 months of burial.

Keywords

Seed longevityweed seed germination
Type
Weed Biology and Ecology
Information
Weed Science , Volume 35 , Issue 4 , July 1987 , pp. 524 - 528
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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