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Root Development and Production of a Witchweed (Striga spp.) Germination Stimulant in Sorghum (Sorghum bicolor) Cultivars

Published online by Cambridge University Press:  12 June 2017

Alain Olivier  and
Gilles D. Leroux
Alain Olivier
Affiliation:
Dep. Phytologie, Univ. Laval, Ste-Foy (QC), Canada, G1K 7P4
Gilles D. Leroux
Affiliation:
Dep. Phytologie, Univ. Laval, Ste-Foy (QC), Canada, G1K 7P4
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Abstract

Sorghum cultivars were compared for their root development and production of the witchweed germination stimulant sorgoleone. In pot experiments, the resistant cultivar IS-7777 yielded a greater root biomass and root length, but a smaller root length/biomass ratio than the highly susceptible cultivars CK-60B and Bimbiri. Seedlings of these latter two cultivars exuded a high concentration of sorgoleone, while the low-susceptible cultivar IS-14825 exhibited a low production of this compound. In contrast, the low-susceptible cultivar Seguetana Niarabougou exhibited a high production of sorgoleone, while the resistant cultivars IS-7777 and Framida exuded a moderate amount of this compound. These results indicate that witchweed seed avoidance by means of reduced root growth is unlikely to be an important factor involved in the resistance of IS-7777. Low production of sorgoleone could partly explain low susceptibility of IS-14825, but other compounds may play a more significant role in the stimulation of witchweed germination.

Keywords

Witchweed, Striga hermonthica (Del.) Benth. and Striga asiatica (L.) Kuntzesorghum, Sorghum bicolor (L.) Moenchmaize, Zea mays L.pearl millet, Pennisetum typhoides BurmRoot lengthhost root exudatesHPLCbenzoquinonesorgoleone
Type
Weed Biology and Ecology
Information
Weed Science , Volume 40 , Issue 4 , December 1992 , pp. 542 - 545
Copyright
Copyright © 1992 by the Weed Science Society of America 

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