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Correlation Between the Rates of Foliar Dark Respiration and Net Photosynthesis in Some Tropical Dicot Weeds

Published online by Cambridge University Press:  12 June 2017

G. Rajendrudu ,
J. S. Rama Prasad  and
V. S. Rama Das
G. Rajendrudu
Affiliation:
Dep. Bot., School of Biol. and Earth Sci., Sri Venkateswara Univ., Tirupati–517 502, India
J. S. Rama Prasad
Affiliation:
Dep. Bot., School of Biol. and Earth Sci., Sri Venkateswara Univ., Tirupati–517 502, India
V. S. Rama Das
Affiliation:
Dep. Bot., School of Biol. and Earth Sci., Sri Venkateswara Univ., Tirupati–517 502, India
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Abstract

The rates of foliar dark respiration and net photosynthesis in attached leaves of 25 C3, C4, and C3-C4 intermediate dicotyledonous weed species were determined using the infrared gas analyzer. The ratio of dark respiration to photosynthesis per unit leaf area in attached leaves of each species was inversely proportional to leaf age. Highly significant, positive linear correlation was observed between the rates of foliar dark respiration and net photosynthetic CO2 uptake in dicot weeds irrespective of the photosynthetic type. The higher foliar dark respiration rate found in some of the weed species can be attributed in part to the higher carbohydrate levels as generated by a rapid photosynthetic CO2 assimilation. The significance of higher dark respiration rate in relation to carbon and energy economy of weeds is discussed.

Keywords

C3 plantsC4 plantsontogenycarbohydrate generation
Type
Physiology, Chemistry, abd Biochemistry
Information
Weed Science , Volume 35 , Issue 2 , March 1987 , pp. 141 - 144
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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