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Effects of Pyrazon on Bean Chloroplast Ultrastructure

Published online by Cambridge University Press:  12 June 2017

J. LaMar Anderson  and
J. Philip Schaelling
J. LaMar Anderson
Affiliation:
Department of Plant Science, Utah State University, Logan, Utah
J. Philip Schaelling
Affiliation:
Department of Plant Science, Utah State University, Logan, Utah
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Abstract

The fine structure of the chloroplasts of bean (Phaseolus vulgaris L., var. Tendercrop) was grossly altered by treatment with 5-amino-4-chloro-2-phenyl-3(2H)-pyridazinone (pyrazon) when plants were grown in a treated medium. Alterations occurred first at the leaf margins and preceded visual symptoms. Chloroplasts became spherical and swollen rather than discoid, clumped rather than peripherally arranged, and were totally devoid of starch. Grana formation was inhibited; the thylakoids became swollen and perforated, and they ultimately disintegrated. Concomitant with grana inhibition was the increase in size and number of lipid globules. Occasional breakage of the outer chloroplast membrane was observed. It is proposed that these changes result because pyrazon inhibits thylakoid structural protein formation.

Type
Research Article
Information
Weed Science , Volume 18 , Issue 4 , July 1970 , pp. 455 - 459
Copyright
Copyright © 1970 Weed Science Society of America 

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References

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