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Effect of Field Application of Growth Regulators on Secondary Dormancy of Common Ragweed (Ambrosia artemisiifolia) Seeds

Published online by Cambridge University Press:  12 June 2017

Cyrus Samimy  and
Anwar A. Khan
Cyrus Samimy
Affiliation:
Dep. Seed Vegetable Sci., New York State Agric. Exp. Stn., Cornell Univ., Geneva, NY 14456
Anwar A. Khan
Affiliation:
Dep. Seed Vegetable Sci., New York State Agric. Exp. Stn., Cornell Univ., Geneva, NY 14456
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Abstract

Winter chilling in the field removed the primary dormancy in common ragweed (Ambrosia artemisiifolia L.) seeds and allowed them to germinate in both light and darkness. A secondary dormancy was induced in the spring and seeds again failed to germinate in light or darkness. Kinetin (K) + ethephon (E) + gibberellin A4 + A7 (GA4+7) applied to the soil in December prevented secondary dormancy. The following May only 20% of the seeds at the 15-cm depth remained viable. The rest had germinated or decayed. In contrast, 89% of the untreated seeds remained viable. Application of K + E + GA4+7 on April 22 and May 2 also broke the secondary dormancy. Gibberellin A3 (GA3) was less effective than GA4+7 in preventing or breaking secondary dormancy.

Keywords

Osmoconditioningpolyethylene glycolgermination advancementgibberellinprimary dormancy
Type
Research Article
Information
Weed Science , Volume 31 , Issue 3 , May 1983 , pp. 299 - 303
Copyright
Copyright © 1983 Weed Science Society of America 

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References

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