Variability in the germination of spores among and within natural populations of the endangered tree fern Dicksonia sellowiana Hook. (Xaxim)

Brazilian Archives of Biology and Technology

Gabriela Schmitz Gomes¹  Áurea Maria Randi²  Ângelo Puchalski¹  Daisy Da Silva Santos¹  Maurício Sedrez Dos Reis¹ 

[1] ,Centro de Ciências Agrárias Núcleo de Pesquisas em Florestas Tropicais Departamento de Fitotecnia

关键词: Arborescent fern;    Dicksonia sellowiana;    spore germination;    intraspecific variability;    adaptative strategies;   

DOI  :  10.1590/S1516-89132006000100001

来源: SciELO

【 摘 要 】

The objective of this study was to analyze the existing variability in the germination of individuals' spores collected from two natural populations of Dicksonia sellowiana in southern Brazil. The largest intrapopulational variation was observed for the spores germination. These results suggested the existence of adaptative strategies that favored the gradual and continuous entrance of new individuals into the gametophytic population. The behavior of the individuals of the species within each population followed a similar pattern of initial development, in spite of conspicuous differences in the population structure. This showed a low differentiation between the populations and the existence of adaptative strategies which were common to both communities.

【 授权许可】

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