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Effect of Planting Depth on Velvetleaf (Abutilon theophrasti) Seedling Development and Response to Cyanazine

Published online by Cambridge University Press:  12 June 2017

Thomas C. Mester  and
Douglas D. Buhler
Thomas C. Mester
Affiliation:
Dep. Agron., Univ. Wisconsin, Madison, WI 53706
Douglas D. Buhler
Affiliation:
Dep. Agron., Univ. Wisconsin, Madison, WI 53706
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Abstract

Experiments were conducted in a growth chamber to determine the effects of planting depth on the developmental sequence of velvetleaf seedlings and the effect of cyanazine placement relative to velvetleaf planting depth on cyanazine toxicity. Velvetleaf seedling emergence was delayed when seeds were planted 6 cm deep compared to the 2- and 4-cm planting depths. Lateral roots did not appear until after the cotyledons had emerged and expanded. This was followed by secondary root emergence from the primary root which occurred before adventitious roots appeared from the hypocotyl for the 2- and 4-cm planting depths. The first true leaf did not unfold until after the secondary root system was well developed. The quantity of adventitious roots on the hypocotyl increased with increasing planting depth. Velvetleaf adventitious roots appeared to be involved in cyanazine toxicity when cyanazine was placed above the seed. Increasing planting depth increased the proportion of seedling absorptive tissue above compared to below the seed. This resulted in increased cyanazine exposure for the deeper planted velvetleaf seeds when herbicide was placed above the seed.

Keywords

Cyanazine, 2-[[4-chloro-6-(ethylamino)-1,3,5-triazin-2-yl]amino]-2-methylpropanenitrilevelvetleaf, Abutilon theophrasti Medik. ♯3 ABUTHHerbicide placementroot developmentseedling morphologyABUTH
Type
Weed Biology and Ecology
Information
Weed Science , Volume 38 , Issue 1 , January 1990 , pp. 34 - 38
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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