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Effect of Heat and Drought Stress on Sorghum (Sorghum Bicolor). I. Panicle Development and Leaf Appearance

Published online by Cambridge University Press:  03 October 2008

P. Q. Craufurd ,
D. J. Flower  and
J. M. Peacock
P. Q. Craufurd
Affiliation:
Cereals Program, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India
D. J. Flower
Affiliation:
Cereals Program, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India
J. M. Peacock
Affiliation:
Cereals Program, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India
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Summary

Seven sorghum lines, flowering from 50 to 87 days after sowing, were subjected to early drought stress, late stress, and both early and late stress in the field during the dry season in India. Panicle initiation was delayed by 2–25 days and flowering by 1–59 days by the drought stress treatments, the greatest effect being in the treatment subjected to both early and late stress. Stress increased the period between panicle initiation and flowering by retarding the rate of panicle development; when stress was severe panicle development stopped. Upon relief of stress following irrigation, panicle development resumed at rates comparable to those in a fully irrigated control. The rate of leaf appearance was affected in a similar manner to panicle development soon after water was withheld. Rate of leaf appearance and panicle development decreased as pre-dawn leaf water potential decreased and ceased at water potentials of −0.55 and −0.7 MPa, respectively.

Type
Research Article
Information
Experimental Agriculture , Volume 29 , Issue 1 , January 1993 , pp. 61 - 76
Copyright
Copyright © Cambridge University Press 1993

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