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The Reversal of Scotoactive Stomatal Behavior in some Woody Weeds by Paraquat and 2,4,5-T

Published online by Cambridge University Press:  12 June 2017

I. Madhusudana Rao ,
P.M. Swamy  and
V.S.R. Das
I. Madhusudana Rao
Affiliation:
Dep. of Bot., Sri Venkateswara Univ., Tirupati – 517 502, India
P.M. Swamy
Affiliation:
Dep. of Bot., Sri Venkateswara Univ., Tirupati – 517 502, India
V.S.R. Das
Affiliation:
Dep. of Bot., Sri Venkateswara Univ., Tirupati – 517 502, India
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Abstract

A typical scotoactive stomatal behavior was noticed in Carissa spinarum L.; Gymnosporia emarginata Laws; Maba buxifolia Cl.; Flacourtia sepiaria Roxb.; Dodonaea viscosa L. and Randia malabarica Lamk. This stomatal behavior was reversed artificially by foliar application of paraquat (1,1′-dimethyl-4,4′-bipyridinium ion) at 100 ppmw or 2,4,5-T [(2,4,5-trichlorophenoxy)acetic acid] at 2000 ppmw. The size of the stomatal aperture, stomatal conductance and the rates of transpiration were enhanced significantly by the herbicide treatment. The physiological basis for the induction of desiccation and death of plant organs is thought to be the excessive stimulation of stomatal aperture, stomatal conductance and consequently high rates of transpiration observed here. The data suggest that herbicide-induced desiccation is the consequence of inhibition of scotoactive behavior and increased water loss with attendant desiccation and death of leaves.

Type
Research Article
Information
Weed Science , Volume 25 , Issue 6 , November 1977 , pp. 469 - 472
Copyright
Copyright © 1977 by the Weed Science Society of America 

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References

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