Canadian Journal of Botany - Revue Canadienne de Botanique (1993) 71, 786-792

M.J. van Hezewijk, A.P. van Beem, J.A.C. Verkleij and A.H. Pieterse (1993)
Germination of Orobanche crenata seeds, as influenced by conditioning temperature and period
Canadian Journal of Botany - Revue Canadienne de Botanique 71 (6), 786-792
Abstract: The effects of conditioning temperature and length of the conditioning period on germination of seeds of the parasitic weed Orobanche crenata were investigated in vitro. Seed samples from Syria and Egypt, collected in various years, were compared. Optimum temperature for conditioning was 15-20 °C for Syrian seeds and 20 or 15-20 °C for Egyptian seeds. At 20 °C a conditioning period of 18 days was required for maximum germination. When conditioning at 20 °C was prolonged beyond 7 weeks, germination decreased. This effect was more pronounced for Egyptian seeds than for Syrian seeds. Germination of Syrian seeds was strongly reduced after conditioning for more than 4 weeks at 15 or 10 °C. A stepwise decrease in temperature during conditioning did not enhance this effect. The results of a tetrazolium test indicated that the seeds most probably did not die but developed secondary dormancy.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Orobanche crenata (weed)		Egypt
	Orobanche crenata (weed)		Syria