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Histological Effects of Ethephon and 2,4,5-T on Mesquite

Published online by Cambridge University Press:  12 June 2017

P. R. Morey ,
R. E. Sosebee  and
B. E. Dahl
P. R. Morey
Affiliation:
Dep. Biol. Sci., Texas Tech Univ., Lubbock, TX 79409
R. E. Sosebee
Affiliation:
Dep. Range and Wildlife Mgt., Texas Tech Univ., Lubbock, TX 79409
B. E. Dahl
Affiliation:
Dep. Range and Wildlife Mgt., Texas Tech Univ., Lubbock, TX 79409
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Abstract

Six-week-old honey mesquite [Prosopis glandulosa (Torr.) var. glandulosa] seedlings were treated with various concentrations of ethephon (2-chloroethylphosphonic acid) and 2,4,5-T [(2,4,5-trichlorophenoxy)acetic acid] alone and in combinations to determine effect on stem mortality under greenhouse conditions. Ethephon alone at 0.05 g/L brought about defoliation and a reduction in xylem tissue formation but did not affect the histological development of the stem tissue. Treatment with 2,4,5-T alone at 3.2 g/L resulted in 40% stem mortality along with the formation of abnormal xylem tissue of reduced thickness. A combination of ethephon (0.05 g/L) and 2,4,5-T (3.2 g/L) significantly increased mesquite mortality. This was associated with a further reduction in xylem thickness, abnormal development of the xylem, abnormal positional relationships of vascular tissues, and initiation of adventitious roots. This study showed that ethephon in combination with 2,4,5-T was more effective than either treatment alone in promoting the disruption of the tissue systems of the stem and in increasing control of mesquite seedlings.

Type
Research Article
Information
Weed Science , Volume 24 , Issue 3 , May 1976 , pp. 292 - 297
Copyright
Copyright © 1976 by the Weed Science Society of America 

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References

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