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Secondary Dormancy, Growth-Regulator Effects, and Embryo Growth Potential in Curly Dock (Rumex crispus) Seeds

Published online by Cambridge University Press:  12 June 2017

Cyrus Samimy  and
Anwar A. Khan
Cyrus Samimy
Affiliation:
Dep. Seed and Veg. Sci., Cornell Univ., Geneva, NY 14456
Anwar A. Khan
Affiliation:
Dep. Seed and Veg. Sci., Cornell Univ., Geneva, NY 14456
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Abstract

Curly dock (Rumex crispus L.) seeds failed to germinate in the dark, but germinated readily in light at 15, 20, and 25C. A secondary dormancy was induced in these seeds by 6 days of dark or light incubation at 30C (thermodormancy), by 6 days of dark incubation at 15C, or by a prolonged soaking in −15.7 bar polyethylene glycol-6000 (PEG) solution at 15C in light. The secondary dormancy induced at 15C was partially removed by 2-chloroethylphosphonic acid (ethephon) in presence of light; however, when the dormancy was induced at 30C, an addition of gibberellin A4+7 (GA4+7) to ethephon was necessary for effective removal of the dormancy. The ability of growth regulators to remove the secondary dormancy induced by prolonged dark incubation at 15C decreased progressively in light as the duration of dark incubation increased. The water-potential studies indicate that the thermodormancy can be attributed, at least in part, to the inability of the embryonic cells to lower their water potential to a level sufficient to cause radicle protrusion.

Keywords

Water potential (seeds)seed germinationethephonGA4+7
Type
Research Article
Information
Weed Science , Volume 31 , Issue 2 , March 1983 , pp. 153 - 158
Copyright
Copyright © 1983 Weed Science Society of America 

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References

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