Effects of three phenolic acids on chlorophyll content and growth of soybean and grain sorghum seedlings |
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Authors: | Frank A Einhellig James A Rasmussen |
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Affiliation: | (1) Biology Department, University of South Dakota, 57069 Vermillion, South Dakota;(2) Biology Department, Mount Marty College, 57078 Yankton, South Dakota |
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Abstract: | Experiments were designed to test the hypothesis that interference with chlorophyll metabolism may be one mechanism of inhibition of plant growth in allelopathic interactions. Effects of ferulic,p-coumaric, and vanillic acids on soybean and grain sorghum growth and chlorophyll content were quantified and compared after seedlings were treated with these compounds in a nutrient culture. Following a 6-day treatment cycle, dry weights of soybean seedlings were reduced by both 10–3 M and 5 × 10–4 M treatments of ferulic,p-coumaric and vanillic acids. Soybean weight reductions in each case were paralleled by a significant reduction in the concentration ( g Chl/mg dry wt) of chlorophylls a and b and total chlorophyll in the unifoliate leaves. Sorghum seedling growth was also reduced by each of the compounds at the 5 × 10–4 M level, but leaf chlorophyll concentration was not below that of control plants. |
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Keywords: | Ferulic acid p-coumaric acid vanillic acid chlorophyll a chlorophyll b allelopathy inhibitors soybean sorghum |
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