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Total Nonstructural Carbohydrates and Regrowth in Honey Mesquite (Prosopis glandulosa) Following Hand Defoliation or Clopyralid Treatment

Published online by Cambridge University Press:  12 June 2017

Harry T. Cralle  and
Rodney W. Bovey
Harry T. Cralle
Affiliation:
Dep. Soil & Crop Sciences, Texas A&M Univ., College Staiton, TX 77843
Rodney W. Bovey
Affiliation:
USDA-ARS, Dep. of Range Land Ecology and Management, Texas A&M Univ., College Staiton, TX 77843
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Abstract

Greenhouse experiments were conducted to assess the storage of nonstructural carbohydrates in the stems and roots of honey mesquite and their mobilization and utilization following defoliation by hand or clopyralid. All leaves were removed by hand from one group of plants while leaving stems intact. Another group received a foliar spray of clopyralid at a sublethal acid equivalent rate of 0.07 kg ha−1. Samplings at treatment on day 0 and at 14, 28, 42, and 58 d after treatment measured leaf area; dry weight of leaves, stems, and roots; and grams and percent total nonstructural carbohydrates in stems and roots. Controls accumulated dry weight and grams total nonstructural carbohydrates in stems and roots, while maintaining a constant percent total nonstructural carbohydrates throughout the experiment. Percent and grams total nonstructural carbohydrates in stems and roots of hand defoliated plants decreased by about one-half from day 0 to 14 as new leaf growth occurred, but increased and returned to pretreatment levels on day 28. A similiar, though slower, pattern of decline and recovery of total nonstructural carbohydrates in stems and roots occurred in response to defoliation by clopyralid. These results showed that the nonstructural carbohydrates in stems and roots of honey mesquite were important sources of carbohydrates to support new leaf regrowth following defoliation by hand or herbicide.

Keywords

Clopyralid [3,6-dichloro-2-pyridinecarboxylic acid], honey mesquite, Prosopis glandulosa Torr. ♯ PRCJGHerbicidescarbohydratestotal nonstructural carbohydratesPRCJG
Type
Weed Biology and Ecology
Information
Weed Science , Volume 44 , Issue 3 , September 1996 , pp. 566 - 569
Copyright
Copyright © 1996 by the Weed Science Society of America 

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