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Physiological seed quality evaluation and seedling lipid and protein content of soybean Merrill, in the presence of rho-coumaric acid


, : Physiological seed quality evaluation and seedling lipid and protein content of soybean Merrill, in the presence of rho-coumaric acid. Seed Science & Technology 29(1): 151-162

The phenolic acids (PA), which have been widely studied by researchers due to their action upon seedlings germination and growth, as well as upon plant metabolism, can affect the yield of the crops, resulting in damage to the agriculturists. The experiment carried out in this study aimed to evaluate the influence of rho-coumaric acid (rho-CA) on germination and vigor of soybean seeds and in the quantification of total lipids and total soluble proteins of Embrapa-58 variety. The seeds were laid out on three sheets of towel paper and submitted to different concentrations (0, 0.1, 1.0, 5.0 and 10.0 Mm) of the PA. These sheets were then made into rolls and placed in a Mangelsdorf germinator at 25degreeC for eight days. The seeds were evaluated by three different means: a germination test, radicle and hypocotyl lengths, as well as their fresh and dry biomass. For the biochemistry evaluations the seeds were germinated for a seven day period and after that, the seedlings were dried at 80degreeC, during 24 hr and, afterwards, the lipid content of cotyledons and proteins in the three components of seedlings were assessed. The results showed that there were no significant differences in terms of cumulative seed germination in the presence of the compound studied, although a delay was observed in the germinative process. However, in the seed germination test a great reduction in normal seedlings was observed. In relation to the growth evaluation of seedlings a great reduction in the length of radicles was verified. As for the biomass evaluation, a decrease of fresh and dry biomass, mainly of radicles was observed. In the biochemistry evaluations an increase of lipids and protein content was found out in the presence of rho-CA. Although the action mechanisms of these allelochemicals are not completely elucidated, the results showed alterations not only in the seedlings morphology, especially in the roots, but also in the metabolism of proteins and in the mobilization of lipids.

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