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Effects of Napropamide on Growth and Anatomy of Corn, Zea mays, Roots

Published online by Cambridge University Press:  12 June 2017

Joseph M. Di Tomaso ,
Floyd M. Ashton  and
Thomas L. Rost
Joseph M. Di Tomaso
Affiliation:
Dep. Bot., Univ. California, Davis, CA 95616
Floyd M. Ashton
Affiliation:
Dep. Bot., Univ. California, Davis, CA 95616
Thomas L. Rost
Affiliation:
Dep. Bot., Univ. California, Davis, CA 95616
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Abstract

Structural studies were conducted to evaluate the effects of napropamide on the growth and development of corn roots. At 1.0 and 10.0 μM napropamide, root growth was inhibited severely within 3 days of seed germination. Root diameter within 1 mm of the root apex doubled and numerous lateral root primordia were observed within 10 mm of the meristem tip in treated roots. The number of cortical parenchyma cell files, xylem vessel, and phloem sieve tube strands also significantly increased. Average cortical cell size did not change, regardless of the treatment. A lateral expansion of the meristematic region of the root coincided with a slight reduction in meristem length but resulted in an overall increase in meristem volume. However, enlargement of the meristem occurred despite a reduction in the number of mitotic figures in the root meristem. Treatment of excised root tips for 24 h with 20 μM napropamide reduced the number of mitotic figures 84%.

Keywords

Napropamide, N,N-diethyl-2-(1-naphthalenloxy)propionamidecorn, Zea mays L. ‘Iochief’Cell divisionherbicide injurymitotic indexmeristem
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 36 , Issue 4 , July 1988 , pp. 457 - 463
Copyright
Copyright © 1988 by the Weed Science Society of America 

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