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Effects of boron and para-hydroxybenzoic acid (pHBA) on velvetleaf.

The allelochemical pHBA potentially inhibits plant growth by disturbing membrane functions. Greenhouse growth studies were conducted to determine if pHBA levels near the growth-inhibition threshold altered mineral content of velvetleaf (Abutilon theophrasti Medic.) tissue, and if the level of available boron (B) modified pHBA effects. Seedlings were grown 3-4 weeks in nutrient solution using a randomized factorial experimental design. Trial 1 had crossed treatments of zero, 250, and 500[micro]M pHBA and 1, 10, and 50[micro]M B. Trials 2 and 3 added 100[micro]M B treatments, and the growth media pH was adjusted to 5.5 and aerated. Trail 1 plants in 1[micro]M B and 500[micro]M pHBA had reduced root, shoot, and leaf dry weights and leaf area. The pHBA*B interaction was significant on growth. In subsequent trials, 1[micro]M B levels reduced growth in pHBA-treated plants. Compared to 10[micro]M B controls, leaf B content was significantly lower in plants grown in 1[micro]M B, and higher in the 100[micro]M B media. Plants grown with 500[micro]M pHBA had elevated K, Mg, Mn and P leaf content (ppm), but there were no effects on Fe and Ca. Light and temperature growth variations between trials affected the pHBA inhibition threshold. The data was inconclusive regarding B augmentation overcoming allelopathic effects of pHBA.

* Remley, M.A. and F.A. Einhellig. Departments of Agriculture and Biology, Southwest Missouri State University.
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Title Annotation:Biology, Senior Division
Author:Oller, Anna
Publication:Transactions of the Missouri Academy of Science
Article Type:Abstract
Geographic Code:1U4MO
Date:Jan 1, 2005
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