Effect of seed coat on the seed germination and seedling development of Calophyllum brasiliense Cambess. (Clusiaceae)

This work aimed to study the effect of the Calophyllum brasiliense seed coat on the seed germination process. To this end, three experiments were conducted in laboratory, greenhouse and screenhouse. From a total of six treatments, five are related to the seed coat (mechanical scarification; mechanic...

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Bibliographic Details
Published in:Acta scientiarum. Biological sciences Vol. 36; no. 4; pp. 451 - 456
Main Authors: de Jesus, Valquiria Aparecida Mendes, Braccini, Alessandro Lucca, Scapim, Carlos Alberto, Santos, Fabio Lucio, Mariucci, Giovanna Emanuelle Goncalves, Suzukawa, Andreia Kazumi
Format: Journal Article
Language:English
Published: Universidade Estadual de Maringa 01-10-2014
Universidade Estadual de Maringá
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Summary:This work aimed to study the effect of the Calophyllum brasiliense seed coat on the seed germination process. To this end, three experiments were conducted in laboratory, greenhouse and screenhouse. From a total of six treatments, five are related to the seed coat (mechanical scarification; mechanical scarification followed by 2 hours in water, chemical scarification, hot water immersion and complete seed coat removal) and one control. Laboratory and greenhouse experiments were conducted in a completely randomized design (CRD). Screenhouse experiment was conducted in a completely randomized block design (RBD). We evaluated the total percentage, the speed index and the average time of germination or emergence. Data were subjected to analysis of variance and means compared by LSD test, at 5%. Under the conditions of this work, it was possible to infer that, in laboratory, mechanical scarification followed by 2 hours in water increases the proportion and germination speed index (GSI), in the greenhouse, the complete seed coat removal increases the percentage and emergence speed index (ESI), and in the screenhouse, mechanical scarification followed by 2 hours in water and chemical scarification presented the best results. The average germination time was not significantly different in the three experiments evaluated. Keywords: native species, diaspore, seed dormancy, Calophyllum brasiliense. Objetivou-se com este trabalho estudar o efeito do envoltorio da semente de Calophyllum brasiliense no processo de germinacao. Foram montados tres experimentos, sendo estes conduzidos em laboratorio, casa de vegetacao e telado. Avaliaram-se seis tratamentos, sendo cinco relacionados ao envoltorio (escarificacao mecanica; escarificacao mecanica seguido por 2h em agua; escarificacao quimica; imersao em agua quente; e retirada total do envoltorio) e a testemunha. Os experimentos em laboratorio e casa de vegetacao foram conduzidos em delineamento inteiramente casualizado. No telado, o experimento foi conduzido em delineamento em blocos casualizados. Avaliaram-se a percentagem total; o indice de velocidade e o tempo medio de germinacao ou emergencia. Os dados foram submetidos a analise de variancia e as medias comparadas pelo teste t (LSD) a 5% de probabilidade. Foi possivel inferir que no laboratorio, a escarificacao mecanica, seguido por 2h em agua, aumenta a percentagem e o indice de velocidade de germinacao (IVG); na casa de vegetacao, a retirada total do envoltorio aumenta a percentagem e o indice de velocidade de emergencia (IVE); e no telado, a escarificacao mecanica, seguida por 2h em agua, e a escarificacao quimica apresentam os melhores resultados. O tempo de germinacao nao apresentou diferenca significativa nos tres experimentos avaliados. Palavras-chave: especie nativa, diasporo, dormencia, Calophyllum brasiliense.
ISSN:1679-9283
1807-863X
DOI:10.4025/actascibiolsci.v36i4.21401