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Heat-induced changes in dry weight, leaf size and number of chloroplasts per cell in maize and cowpea shoots

Published online by Cambridge University Press:  27 March 2009

S. A. Adelusi  and
A. O. Lawanson
S. A. Adelusi
Affiliation:
Department of BiologyUniversity of Ife, Ile-Ife, Nigeria
A. O. Lawanson
Affiliation:
Department of BiologyUniversity of Ife, Ile-Ife, Nigeria
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Summary

When etiolated seedlings of maize and cowpea were subjected to a heat stress of 45 °C for 8 h and subsequently illuminated, there was a retardation in the rates of leaf elongation and chloroplast formation, but the rate of increase in dry weight was not affected. However, a heat stress of 45 °C for 16 h decreased all the three rates measured, the effects being more pronounced with the longer duration of stress in the case of leaf elongation and chloroplast formation. The cowpea seedlings were more sensitive to heat than the maize seedlings. The decreased yield (dry weight) in the 16 h treatment was due, at least partly, to the heat-induced retardation of the growth of the photosynthetic apparatus.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 91 , Issue 2 , October 1978 , pp. 349 - 357
Copyright
Copyright © Cambridge University Press 1978

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