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      Effects of some phenolic compounds on soybean seed germination and on seed-borne fungi

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          Abstract

          Studies were carried out on the effects of coumarin, ferulic acid and naringenin on soybean seed germination and on the growth of seed-borne fungi at concentrations of 50 and 100 mg.L-1. The compounds showed good inhibition of seed germination, especially at 50 mg.L-1, but little fungistatic activity. Possible mechanisms of action are discussed.

          Translated abstract

          Os compostos fenólicos são metabólitos secundários importantes na ecologia vegetal, especialmente em relações alelopáticas e interações com microorganismos, sendo sintetizados principalmente através da via do ácido chiquímico. Neste trabalho, os efeitos de cumarina, ácido ferúlico e naringenina sobre a germinação de sementes de soja e sobre o crescimento de fungos contaminantes foram investigados, nas concentrações de 50 e 100 mg.L-1. A germinação das sementes e o crescimento dos fungos foram estudados através de método do rolo de papel e do método do papel de filtro, respectivamente. Os compostos mostraram alta inibição da germinação das sementes, principalmente a 50 mg.L-1, porém baixa atividade fungistática. Possíveis mecanismos de ação são discutidos.

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          Most cited references42

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          Regraspara análise de sementes

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            Allelopathy

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              Flavonoid and isoflavonoid distribution in developing soybean seedling tissues and in seed and root exudates.

              T. Graham (1991)
              The distribution of flavonoids, isoflavonoids, and their conjugates in developing soybean (Glycine max L.) seedling organs and in root and seed exudates has been examined. Conjugates of the isoflavones daidzein and genistein are major metabolites in all embryonic organs within the dry seed and in seedling roots, hypocotyl, and cotyledon tissues at all times after germination. Primary leaf tissues undergo a programmed shift from isoflavonoid to flavonoid metabolism 3 days after germination and become largely predominated by glycosides of the flavonols kampferol, quercetin, and isorhamnetin by 5 days. Cotyledons contain relatively constant and very high levels of conjugates of both daidzein and genistein. Hypocotyl tissues contain a third unidentified compound, P19.3, also present in multiple conjugated forms. Conjugates of daidzein, genistein, and P19.3 are at their highest levels in the hypocotyl hook and fall off progressively down the hypocotyl. These isoflavones also undergo a programmed and dramatic decrease between 2 and 4 days in the hypocotyl hook. All root sections are predominated by daidzein and its conjugates, particularly in the root tip, where they reach the highest levels in the seedling. Light has a pronounced effect on the distribution of the isoflavones; in the dark, isoflavone levels in the root tips are greatly reduced, while those in the cotyledons are higher. Finally, the conjugates of daidzein and genistein and several unidentified aromatic metabolites are selectively excreted into root and seed exudates. Analysis of seed exudates suggests that this is a continuous, but saturable event.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                babt
                Brazilian Archives of Biology and Technology
                Braz. arch. biol. technol.
                Instituto de Tecnologia do Paraná - Tecpar (Curitiba )
                1678-4324
                March 2003
                : 46
                : 2
                : 155-161
                Affiliations
                [1 ] Universidade Estadual Paulista Brazil
                [2 ] Universidade Estadual Paulista Brazil
                [3 ] Universidade Estadual Paulista Brazil
                Article
                S1516-89132003000200003
                10.1590/S1516-89132003000200003
                78f2910f-70d3-4964-87b2-9d951cbffa93

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1516-8913&lng=en
                Categories
                BIOLOGY

                General life sciences
                Glycine max,soybean,phenolics,coumarin,ferulic acid,naringenin
                General life sciences
                Glycine max, soybean, phenolics, coumarin, ferulic acid, naringenin

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