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Development in Cowpea (Vigna unguiculata). II. Effect of Temperature and Saturation Deficit on Time to Flowering in Photoperiod-Insensitive Genotypes

Published online by Cambridge University Press:  03 October 2008

P. Q. Craufurd ,
A. Qi ,
R. H. Ellis ,
R. J. Summerfield  and
E. H. Roberts
P. Q. Craufurd
Affiliation:
International Institute of Tropical Agriculture (LITA), Kano Station, Sabo Bakin Zuwo Road, PMB 3112, Kano, Nigeria University of Reading, Department of Agriculture, Plant Environment Laboratory, Cutbush Lane, Shinfield, Reading RG2 9AD, Berkshire, England
A. Qi
Affiliation:
University of Reading, Department of Agriculture, Plant Environment Laboratory, Cutbush Lane, Shinfield, Reading RG2 9AD, Berkshire, England
R. H. Ellis
Affiliation:
University of Reading, Department of Agriculture, Plant Environment Laboratory, Cutbush Lane, Shinfield, Reading RG2 9AD, Berkshire, England
R. J. Summerfield
Affiliation:
University of Reading, Department of Agriculture, Plant Environment Laboratory, Cutbush Lane, Shinfield, Reading RG2 9AD, Berkshire, England
E. H. Roberts
Affiliation:
University of Reading, Department of Agriculture, Plant Environment Laboratory, Cutbush Lane, Shinfield, Reading RG2 9AD, Berkshire, England
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Summary

Twenty-nine diverse genotypes of cowpea (Vigna unguiculata) were grown in approximately 30 photothermal environments in Nigeria and Niger, with mean temperatures ranging from 19° to 30°C, photoperiods from 10 to 16 h d−1 and saturation deficits from 0.5 to 3.1 kPa. Twelve of these genotypes were insensitive to photoperiod. The time of flowering of these photoperiodinsensitive genotypes showed a similar response to temperature. Time to flowering was also delayed by mean pre-flowering saturation deficits greater than 1.5 kPa. The implications of these responses to temperature and saturation deficit for phenological adaptation in West Africa are discussed.

Type
Research Article
Information
Experimental Agriculture , Volume 32 , Issue 1 , January 1996 , pp. 13 - 28
Copyright
Copyright © Cambridge University Press 1996

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References

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