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Effect of Imazamethabenz on Histology and Histochemistry of Polysaccharides in the Main Shoot of Wild Oat (Avena fatua)

Published online by Cambridge University Press:  12 June 2017

Jian Fu Chao ,
William A. Quick ,
Andrew I. Hsiao  and
Hai Sheng Xie
Jian Fu Chao
Affiliation:
Dep. Biol., Univ. Regina, Regina, SK S4S OA2
William A. Quick
Affiliation:
Dep. Biol., Univ. Regina, Regina, SK S4S OA2
Andrew I. Hsiao
Affiliation:
Agric. Canada, Res. Stn., Box 440, Regina, SK S4P 3A2
Hai Sheng Xie
Affiliation:
Dep. Biol., Univ. Regina, Regina, SK S4S OA2 Canada
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Abstract

Imazamethabenz, an acetohydroxyacid synthase (AHAS)-inhibiting herbicide, was applied at a sublethal rate (200 g ai ha–1) to foliage of greenhouse-grown wild oat plants at the 2-leaf stage without tillers. Main shoot tissues were sampled 1 to 2 wk after imazamethabenz treatment and prepared for light microscopic examination. Histological observations showed that imazamethabenz treatment did not produce drastic changes on leaf structures but did affect chloroplast integrity of fully expanded 2nd leaf and inhibited differentiation of the young 3rd leaf 1 wk after application. The internode length and the number of cells in internodes of the herbicide-treated main stem were greatly reduced, presumably due to the inhibition by imazamethabenz of intercalary meristem cell division in early stages of internode elongation. One week after imazamethabenz application, histochemical studies revealed an increased accumulation of starch granules in chloroplasts of the 2nd leaf but reduced starch levels in the main stem. This confirmed the hypothesis that AHAS inhibitors affected phloem transport of photosynthates.

Keywords

Imazamethabenz, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-4 (and 5)-methylbenzoic acid (3:2)wild oat, Avena fatua L. # AVEFAChloroplast integrityintercalary growthstarch granulemetabolic sinkAVEFA
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 42 , Issue 3 , September 1994 , pp. 345 - 352
Copyright
Copyright © 1994 by the Weed Science Society of America 

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