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Impact of Drought Stress and Temperature on the Parasitic Weeds Striga hermonthica and Alectra vogelii in their Early Growth Stages

Published online by Cambridge University Press:  03 October 2008

Dafalla A. Dawoud  and
J. Sauerborn
Dafalla A. Dawoud
Affiliation:
Institute of Plant Production in the Tropics and Subtropics, University of Hohenheim, 70593 Stuttgart, Germany
J. Sauerborn
Affiliation:
Institute of Plant Production in the Tropics and Subtropics, University of Hohenheim, 70593 Stuttgart, Germany
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Summary

The effect of simulated drought on the germination of Striga hermonthica and Alectra vogelii was studied in growth cabinets. Drought stress was applied either during the preconditioning of the seeds or at the time of application of the germination stimulant. The response of these weeds to a range of alternating day/night temperatures during germination and their attachment to the host plant was also investigated using root chambers. During the preconditioning period S. hermonthica was not sensitive to variation in osmotic potential between 0 and −1.5 MPa but A. vogelii required longer preconditioning periods at −1.2 and −1.5 MPa. The germination of both parasites was significantly reduced by increasing the osmotic potential of the stimulant. Optimum day/night temperatures for germination and attachment of S. hermonthica were 30/20° and 35/25°C, and of A. vogelii 25/15° and 30/20°C. Deviation in temperature from the optimum significantly reduced the germination and attachment of both parasites. The results show that S. hermonthica is more adaptive to adverse climatic conditions of increased osmotic potential and extreme temperatures than A. vogelii.

Efecto de la sequia y la temperatura en malezas parasiticas

Type
Research Article
Information
Experimental Agriculture , Volume 30 , Issue 2 , April 1994 , pp. 249 - 257
Copyright
Copyright © Cambridge University Press 1994

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