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Clomazone Causes Accumulation of Sesquiterpenoids in Cotton (Gossypium hirsutum L.)

Published online by Cambridge University Press:  12 June 2017

Stephen O. Duke ,
Rex N. Paul ,
Josea M. Becerril  and
John H. Schmidt
Stephen O. Duke
Affiliation:
South. Weed Sci. Lab., Agric. Res. Serv., U.S. Dep. Agric., Stoneville, MS 38776
Rex N. Paul
Affiliation:
South. Weed Sci. Lab., Agric. Res. Serv., U.S. Dep. Agric., Stoneville, MS 38776
Josea M. Becerril
Affiliation:
South. Weed Sci. Lab., Agric. Res. Serv., U.S. Dep. Agric., Stoneville, MS 38776
John H. Schmidt
Affiliation:
Cotton Physiol, and Genet. Lab., Agric. Res. Serv., U.S. Dep. Agric., Stoneville, MS 38776
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Abstract

The herbicide clomazone caused ultrastructural damage to etioplasts of cotton cotyledons. Etioplast envelopes were irregular, prothylakoids were absent or irregular, stroma density was low, and there were abnormal stromal vesicles. Further damage occurred upon exposure to light. Clomazone greatly slowed the conversion of chlorophyllide to chlorophyll in cotton, suggesting that phytol synthesis was affected. Neither synthesis of protochlorophyllide nor phototransformation of protochlorophyllide to chlorophyllide was affected by clomazone. Clomazone completely inhibited carotenoid synthesis without an accumulation of phytoene. However, the sesquiterpenoids hemigossypol and the dimeric sesquiterpenoid gossypol accumulated in greater amounts in clomazone-treated than in control tissues. These results indicate that this herbicide inhibits synthesis of terpenoids after the formation of farnesyl pyrophosphate.

Keywords

Clomazone FMC 57020 or 2-[(2-chlorophenyl)methyl]-4,4-dimethyl-3-isoxazolidinone, formerly known as dimethazonecotton, Gossypium hirsutum L.,‘Stoneville 213’ and‘Stoneville 825’CarotenoidsdimethazoneFMC-57020gossypolherbicidehemigossypolterpenoid
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 39 , Issue 3 , September 1991 , pp. 339 - 346
Copyright
Copyright © 1991 by the Weed Science Society of America 

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