Germination and sporophytic development of Regnellidium diphyllum Lindm. (Marsileaceae) in the presence of copper

Acta Botanica Brasilica

Mara Betânia Brizola Cassanego²  Angélica Goldoni²  Fágner Henrique Heldt¹  Daniela Montanari Migliavacca Osório²  Paulo Günter Windisch¹  Annette Droste² 

[1] ,Universidade Feevale Programa de Pós-Graduação em Qualidade Ambiental Novo Hamburgo RS ,Brazil

关键词: fern;    heavy metals;    pollution;    reproduction;    species conservation;    wetlands;   

DOI  :  10.1590/S0102-33062013000100004

来源: SciELO

【 摘 要 】

Regnellidium diphyllum Lindm. is a heterosporous fern growing in wetlands and humid soils that are being converted to agricultural activities. Many products that are used in agriculture contain copper, resulting in surface and groundwater contamination. Germination and initial development tests were performed using Meyer's solution containing copper sulphate at concentrations of 0 (control), 1, 5, 10, 50 and 100 mg L-1. The experiment was conducted in a growth chamber at 25 ± 1ºC for 28 days, with a 12/12-hour light/dark cycle and a photon flux density of 100 µmol m-2 s-1. The lowest germination rate (6%) was observed at 100 mg L-1. Primary root growth was significantly reduced at > 10 mg L-1. Secondary leaves of sporophytes grown in concentrations > 5 mg L-1 were progressively shorter than were those formed by the control plants. We conclude that the release of pollutants containing copper into the natural habitats of R. diphyllum can cause phytotoxicity, threatening the establishment of populations and worsening the already vulnerable conservation status of this species.

【 授权许可】

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