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Seed germination and seedling growth of the Mexican sunflower Tithonia diversifolia (Compositae) in Nigeria, Africa.
Agboola, D A; Idowu, W F; Kadiri, M.
Afiliação
  • Agboola DA; Department of Biological Sciences, University of Agriculture, P.M.B. 2240, Abeokuta, Ogun State, Nigeria. jareagbo@yahoo.com
Rev Biol Trop ; 54(2): 395-402, 2006 Jun.
Article em En | MEDLINE | ID: mdl-18494310
We studied seed germination and seedling growth of the Mexican sunflower Tithonia diversifolia in Nigeria. This involved the usage of some dormancy-releasing methods and the effect of some concentrations of three herbicide formulations on the young seedlings. Initial germination tests on fresh and stored seeds revealed a low percentage germination of less than 30%. The seeds of the weed exhibit dormancy. Subjecting the seeds to wet heat at 80 and 100 degrees C and light treatment terminated dormancy both in the fresh and stored seeds. Light greatly enhanced the germination percentage of seeds by about 70%. There was gradual increase in germination percentage with increase in storage period in dormancy-released seeds. The mean LAR (Leaf Area Ratio), NAR (Net Assimilation Rate) and RGR (Relative Growth Rate) are comparatively high in young seedlings. Concentrations of 0.5-2.0% of Gramoxone, Primextra and Galex are toxic to 1 month old seedlings. For eradication, the seedlings should be attacked at one month stage.
Assuntos
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Atrazina / Sementes / Germinação / Plântula / Helianthus / Herbicidas / Acetamidas Limite: Animals País/Região como assunto: Africa / Mexico Idioma: En Revista: Rev Biol Trop Ano de publicação: 2006 Tipo de documento: Article País de afiliação: Nigéria País de publicação: Costa Rica
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Atrazina / Sementes / Germinação / Plântula / Helianthus / Herbicidas / Acetamidas Limite: Animals País/Região como assunto: Africa / Mexico Idioma: En Revista: Rev Biol Trop Ano de publicação: 2006 Tipo de documento: Article País de afiliação: Nigéria País de publicação: Costa Rica