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• An. Esc. Super. Agric. Luiz de Queiroz 32 • 1975 • https://doi.org/10.1590/S0071-12761975000100007   copiar

Efeitos de giberelinas no desenvolvimento do algodoeiro (Gossypium hirsutum L. cv.'IAC-RM3')

Effects of gibberellins on growth of cotton (Gossypium hirsutum L. cv. 'IAC-RM3')

Autoria SCIMAGO INSTITUTIONS RANKINGS

Resumos

Verificou-se o efeito de giberelinas, quando aplicada sob a forma de pulverização das plântulas, no desenvolvimento do algodoeiro cultivar 'IAC-RM3' em condições de casa-de-vegetação. Estudaram-se as concentrações de 0, 2, 20 e 200 ppm do regulador de crescimento; sendo que os tratamentos aumentaram a altura das plantas em 27, 48 e 65%, com relação ao controle. Aplicações de giberelinas nas dosagens de 2 e 20 ppm promoveram aumento na TAL e na RAF do algodoeiro. A TCR foi superior nas plantas tratadas com giberelinas. Verificou-se ainda que giberelinas a 200 ppm promove redução na TAL e variação mínima na RAF, com relação ao controle.

Seedlings of cotton were treated 19 days after the sowing with gibberellins at concentrations of 2, 20 and 200 ppm and the check to verify The effect of the compound on the growth of the plant. The experiment was done under greenhouse conditions in 1974. The main proposal of this work is to study the variation of plant height, net assimilation rate, relative growth rate and the leaf area ratio with application of gibberellins. The growth regulator at concentrations of 2, 20 and 200 ppm increased plant height, respectively in 27, 48 and 65% when compared to the control. Application of gibberellins at concentrations of 2 and 20 ppm promotes increase in the net assimilation rate and in the leaf area ratio of cotton. The relative growth rate was superior in the plots that received gibberelins at concentrations of 2, 20 and 200 ppm. It was verified that gibberellins at 200 ppm has a tendency to promote reduction in the net assimilation rate and slight variation in the leaf area ratio in relation to check.

Paulo R.C. CastroI; José O.M. MentenII; Juan A.E. AguilarII; Maria N.S. MontanheiroII; Walter S.P. PereiraII; Yoko B. RosatoII

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

IICurso de Pós-Graduação, E.S.A. "Luiz de Queiroz"/USP

RESUMO

Verificou-se o efeito de giberelinas, quando aplicada sob a forma de pulverização das plântulas, no desenvolvimento do algodoeiro cultivar 'IAC-RM3' em condições de casa-de-vegetação.

Estudaram-se as concentrações de 0, 2, 20 e 200 ppm do regulador de crescimento; sendo que os tratamentos aumentaram a altura das plantas em 27, 48 e 65%, com relação ao controle.

Aplicações de giberelinas nas dosagens de 2 e 20 ppm promoveram aumento na TAL e na RAF do algodoeiro. A TCR foi superior nas plantas tratadas com giberelinas.

Verificou-se ainda que giberelinas a 200 ppm promove redução na TAL e variação mínima na RAF, com relação ao controle.

SUMMARY

Seedlings of cotton were treated 19 days after the sowing with gibberellins at concentrations of 2, 20 and 200 ppm and the check to verify The effect of the compound on the growth of the plant. The experiment was done under greenhouse conditions in 1974.

The main proposal of this work is to study the variation of plant height, net assimilation rate, relative growth rate and the leaf area ratio with application of gibberellins.

The growth regulator at concentrations of 2, 20 and 200 ppm increased plant height, respectively in 27, 48 and 65% when compared to the control.

Application of gibberellins at concentrations of 2 and 20 ppm promotes increase in the net assimilation rate and in the leaf area ratio of cotton. The relative growth rate was superior in the plots that received gibberelins at concentrations of 2, 20 and 200 ppm.

It was verified that gibberellins at 200 ppm has a tendency to promote reduction in the net assimilation rate and slight variation in the leaf area ratio in relation to check.

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LITERATURA CITADA

Entregue para publicação em 05/06/1975.

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  • Efeitos de giberelinas no desenvolvimento do algodoeiro (Gossypium hirsutum L. cv.'IAC-RM3')

    Effects of gibberellins on growth of cotton (Gossypium hirsutum L. cv. 'IAC-RM3')

    • Datas de Publicação

    • Publicação nesta coleção
      30 Maio 2012
    • Data do Fascículo
      1975
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