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Planta Daninha

Print version ISSN 0100-8358

Planta daninha vol.17 no.2 Viçosa May/Aug. 1999

http://dx.doi.org/10.1590/S0100-83581999000200002 

Potential for seed bank formation of two weed species from Brazilian Amazonia

 

Potencial para a formação de banco de sementes de duas espécies de plantas daninhas da Amazônia brasileira

 

 

Moacyr B. Dias-Filho

Agronomist, Ph.D., Lab. Ecofisiologia Vegetal, Embrapa Amazônia Oriental, C.P. 48, CEP: 66017-970 Belém/PA, Brazil. Email: moacyr@cpatu.embrapa.br

 

 


ABSTRACT

The potential for seed bank formation of two perennial weed species, Ipomoea asarifolia (Desr.) Roem. & Schult. (Convolvulaceae) and Stachytarpheta cayennensis (Rich.) M. Vahl (Verbenaceae), both common in Amazonia , was evaluated in a degraded pasture area in eastern Brazilian Amazonia . Seeds were enclosed in nylon mesh packets and placed at the soil surface or buried at 5 or 10 cm deep. The number of viable seeds was recorded at 6, 10, 14 and 18 months after burial. Results showed that S. cayennensis has the ability to form persistent soil seed bank, while I. asarifolia seeds do not build up in the soil seed bank. For S. cayennensis and, to some extent, for I. asarifolia, seed survival was highest at greater burial depths.

Key words: Brazil, seed, longevity, Stachytarpheta cayennensis, Ipomoea asarifolia.


RESUMO

O potencial para a formação de banco de sementes de duas espécies perenes de plantas daninhas, Ipomoea asarifolia (Desr.) Roem. & Schult. (Convolvulaceae) e Stachytarpheta cayennensis (Rich.) M. Vahl (Verbenaceae), ambas comuns na Amazônia, foi avaliado em uma área de pastagem degradada na Amazônia oriental brasileira. As sementes foram inseridas em envelopes de tela de nylon e colocadas na superfície do solo ou enterradas a cinco ou 10 cm de profundidade. O número de sementes viáveis foi avaliado aos 6, 12, 14 e 18 meses após o início do ensaio. Os resultados mostraram que S. cayennensis tem o potencial para formar banco de sementes persistente, enquanto que as sementes de I. asarifolia não apresentam esse potencial. Em S. cayennensis e, de certo modo, em I. asarifolia, a sobrevivência de sementes foi maior nas maiores profundidades.

Palavras chave: Brasil, sementes, longevidade, Stachytarpheta cayennensis, Ipomoea asarifolia.


 

 

Texto completo disponível apenas em PDF.

Full text available only in PDF format.

 

 

ACKNOWLEDGEMENTS

To Miguel Simão Neto and José Luiz Covre for the assistance in the field.

 

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Received for publication on 20/08/1998 and in the revised form on 19/10/1998.

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