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Infection by microorganisms on soybean seeds obtained from plants treated with growth regulators

Infestação por microorganismos de sementes de soja obtidas de plantas tratadas com fitoreguladores

Abstracts

This research, deals with the effects of exogenous growth regulators on infection by microorganisms on soybean (Glycine max cv. Davis) seeds. To study the influence of the chemicals, soybean plants were sprayed with gibberellic acid (GA) 100 ppm, (2-chloroethyl) trimethylammonium chloride (CCC) 2,000 ppm, succinic acid-2,2-dimethy1hydrazide (SADH) 4,000 ppm, indolylacetic acid (IAA) 100 ppm, 2,3,5-triiodobenzoic acid (TIBA) 20 ppm (three applications), and Agrostemin (1g/10 ml/ 3 1). Application of growth regulators did not affect infect ion by microorganisms on soybean seeds. The prominent fungus isolated was Phomopsis sojae. Alternaria and Fusarium spp. were isolated from seeds. The presence of a bacterium on the seeds was observed. The delay in harvest and high humidity increased the number of seeds from which Phomopsis was recovered.


Para se verificar o efeito de fitoreguladores na incidência de microorganismos nas sementes de soja (Glycine max cv. Davis) efetuou-se a aplicação, em condições de campo, de ácido giberélico (GA) 100 ppm, cloreto (2-cloroetil) trimetilamônio (CCC) 2.000 ppm, ácido succínico-2,2-dimetílhidrazida -(SADH) 4.000 ppm, ácido indolilacético(IAA) 100 ppm, ácido 2,3,5- triiodobenzóico(TIBA) 20 ppm (3 vezes) e Agrostemin (1 g/10 ml/3 1), além do controle. Observou-se que aplicação de fitoreguladores nas plantas de soja não afetou a incidência de microorganismos nas sementes. Phomopsis sojae foi o principal fungo isolado das sementes. Verificou se ainda a ocorrência de Alternaria sp. e Fusarium sp. nas sementes de soja 'Davis'. Cercospora kikuchii também mostrou-se presente nas sementes de soja, além da ocorrência de bacteriose. Atraso na colheita e alta umidade aumentaram a incidência de Phanopsis.


Paulo R.C. CastroI; Hiroshi KimatiII

IDepartamento de Botânica, E.S.A. "Luiz de Queiroz", USP

IIDepartamento de Fitopatologia, E.S.A. "Luiz de Queiroz", USP

RESUMO

Para se verificar o efeito de fitoreguladores na incidência de microorganismos nas sementes de soja (Glycine max cv. Davis) efetuou-se a aplicação, em condições de campo, de ácido giberélico (GA) 100 ppm, cloreto (2-cloroetil) trimetilamônio (CCC) 2.000 ppm, ácido succínico-2,2-dimetílhidrazida -(SADH) 4.000 ppm, ácido indolilacético(IAA) 100 ppm, ácido 2,3,5- triiodobenzóico(TIBA) 20 ppm (3 vezes) e Agrostemin (1 g/10 ml/3 1), além do controle. Observou-se que aplicação de fitoreguladores nas plantas de soja não afetou a incidência de microorganismos nas sementes. Phomopsis sojae foi o principal fungo isolado das sementes. Verificou se ainda a ocorrência de Alternaria sp. e Fusarium sp. nas sementes de soja 'Davis'. Cercospora kikuchii também mostrou-se presente nas sementes de soja, além da ocorrência de bacteriose. Atraso na colheita e alta umidade aumentaram a incidência de Phanopsis.

SUMMARY

This research, deals with the effects of exogenous growth regulators on infection by microorganisms on soybean (Glycine max cv. Davis) seeds. To study the influence of the chemicals, soybean plants were sprayed with gibberellic acid (GA) 100 ppm, (2-chloroethyl) trimethylammonium chloride (CCC) 2,000 ppm, succinic acid-2,2-dimethy1hydrazide (SADH) 4,000 ppm, indolylacetic acid (IAA) 100 ppm, 2,3,5-triiodobenzoic acid (TIBA) 20 ppm (three applications), and Agrostemin (1g/10 ml/ 3 1). Application of growth regulators did not affect infect ion by microorganisms on soybean seeds. The prominent fungus isolated was Phomopsis sojae. Alternaria and Fusarium spp. were isolated from seeds. The presence of a bacterium on the seeds was observed. The delay in harvest and high humidity increased the number of seeds from which Phomopsis was recovered.

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LITERATURA CITADA

Entregue para publicação em 27/01/1981

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  • Infestação por microorganismos de sementes de soja obtidas de plantas tratadas com fitoreguladores

    Infection by microorganisms on soybean seeds obtained from plants treated with growth regulators
  • Publication Dates

    • Publication in this collection
      18 Apr 2012
    • Date of issue
      1981
    Universidade de São Paulo, Escola Superior de Agricultura Av.Páduas Dias, 11, C.P 9 / Piracicaba - São Paulo, Brasil, tel. (019)3429-4486, (019)3429-4401 - Piracicaba - SP - Brazil
    E-mail: scientia@esalq.usp.br