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Physiological Response of Rice (Oryza sativa) to Fenoxaprop

Published online by Cambridge University Press:  12 June 2017

Derrick M. Oosterhuis ,
Stan D. Wullschleger ,
Ron E. Hampton  and
Rosalind A. Ball
Derrick M. Oosterhuis
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72701
Stan D. Wullschleger
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72701
Ron E. Hampton
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72701
Rosalind A. Ball
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72701
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Abstract

Growth chamber experiments were conducted to elucidate the morphological and physiological responses of rice to postemergence application of fenoxaprop. Two rice cultivars, ‘Newbonnet’ and ‘Mars’, and barnyardgrass were treated with 0.17 kg ai ha−1 fenoxaprop at the five-leaf stage. Within 2 days of fenoxaprop application, rice cultivars developed a white chlorotic band across leaves that were in direct contact with spray droplets. Leaf elongation rates for the two rice cultivars were inhibited by 40% after 4 days and by over 50% after 14 days. Inhibition of leaf elongation by fenoxaprop contributed to an overall decrease in leaf area and shoot dry weight. Net photosynthesis was reduced by 35% in fenoxaprop-treated plants 11 days after application, although stomatal conductance was not affected. Nitrogen fertilization prior to fenoxaprop application increased foliar injury of both rice cultivars. Visible injury symptoms showed the following order of susceptibility to foliar-applied fenoxaprop: barnyardgrass > Mars rice > Newbonnet rice.

Keywords

Barnyardgrass, Echinochloa crus-galli (L.) Beauv. # ECHCGfenoxaprop, (±)-2 - [4 - [(6 - chloro-2-benzoxazolyl)oxy]phenoxy]propanoic acidrice, Oryza sativa L. ‘Mars’ and ‘Newbonnet’Crop injuryepicuticular waxgrowth analysisphotosynthesisstomatal conductanceEchinochloa crus-galliECHCG
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 38 , Issue 6 , November 1990 , pp. 459 - 462
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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