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Effects of Environmental Factors on Dormancy and Germination of Crenate Broomrape (Orobanche crenata)

Published online by Cambridge University Press:  12 June 2017

Francisca López-Granados  and
Luis García-Torres
Francisca López-Granados
Affiliation:
CSIC Inst. of Sustainable Agric., Apdo. 4084, 14080 Córdoba, Spain
Luis García-Torres
Affiliation:
CSIC Inst. of Sustainable Agric., Apdo. 4084, 14080 Córdoba, Spain
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Abstract

The effects of acid scarification, prechilling, summer irrigation, and root extract stimulant from faba bean plants grown during different seasons on crenate broomrape seed dormancy and germination were determined. Immersion of 6- to 12-mo old seed in 0.5 to 5 N H2SO4 solution from 1 to 20 min increased germination by 20%. Similarly, seed pretreatment at temperatures between −4 and 6 C increased germination, regardless of the pretreatment duration. Results suggest that the hard seed coat is an important dormancy mechanism in newly formed crenate broomrape seeds. Summer irrigation did not substantially change the germination capacity of crenate broomrape seeds. The germination stimulant activity of the root extract from faba bean plants grown during different seasons varied considerably, decreasing in this order: autumn > winter > spring > summer. This suggests an ecological adaptation of crenate broomrape to its main host crop.

Keywords

Crenate broomrape, Orobanche crenata Forks. ♯ ORACRFaba bean, Vicia faba L.Parasitic weedscarificationprechillinggermination stimulantseed bankseed coatORACR
Type
Weed Biology and Ecology
Information
Weed Science , Volume 44 , Issue 2 , June 1996 , pp. 284 - 289
Copyright
Copyright © 1996 by the Weed Science Society of America 

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