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Germination Promotion in Dormant Shepherdspurse (Capsella bursa-pastoris) Seeds by Strigol Analogs and Other Stimulants

Published online by Cambridge University Press:  12 June 2017

Judith M. Bradow
Judith M. Bradow*
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Southern Regional Res. Center, New Orleans, LA 70179
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Abstract

Four synthetic multiring analogs of strigol (0.1 mM) were effective as germination stimulants of dormant, unchilled seeds of shepherdspurse (Capsella bursa-pastoris (L.) Medik. # CAPBP). The effect was concentration dependent and exceeded that produced by 0.1 mM gibberellic acid (GA). The analog treatments resulted in normal, unpigmented seedlings after 7 days, whereas GA treatment led to distorted, nongeotropic, yellow seedlings. The strigol analogs were also more effective in inducing shepherdspurse germination than 10 mM nitrate or 5.0 mM thiourea (ineffective in the dark) and 5.0 mM thiourea plus 4.5 mM ascorbate (germination stimulated, but seedling growth, inhibited). Chilling at 4 C for 11 days reduced the effectiveness of the strigol analogs, but not that of gibberellic acid and thiourea plus ascorbate. Ascorbate acts synergistically with thiourea in promoting shepherdspurse germination. Strigol and epistrigol had no effect on either chilled or unchilled shepherdspurse seeds. The stimulation of dormant shepherdspurse seeds by the synthetic strigol analogs is the first demonstration that these compounds have bioregulatory activity in dormant seeds of genera other than Striga.

Keywords

Germination stimulantsgibberellic acidthioureaascorbic acidnitratewitchweedStrigaCAPBP
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 34 , Issue 1 , January 1986 , pp. 1 - 7
Copyright
Copyright © 1986 by the Weed Science Society of America 

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