Tolerância ao cobre em ecótipos de Schinus lentiscifolius March (Anacardiaceae) de áreas de mineração no Rio Grande do Sul, Brasil

Abstract

Recebido em 28-01-89. Aceito em 08-11-98. 23 RESUMO -Sementes de Schinus lentiscifolius March, provenientes de duas áreas de mineração do Rio Grande do Sul, foram submetidas a testes de exposição ao Cu-S04, visando comprovar a tolerância ao cobre na germinação e no desenvolvimento de plântulas. Os testes demonstraram que os dois clones reagem diferentemente ao cobre, porém ambos apresentaram mecanismos de tolerância. Plântulas provenientes de sementes da área de maior concentração de cobre no solo (minas do Seival) apresentam sintomas de toxidez mais tardios do que plântulas provenientes de sementes da área de menor concentração deste íon (mina Sanga Negra).Palavras-chave: tolerância a cobre, Schinus lentiscifolius, áreas de mineração.ABASTRACT -Seeds from Schinus /entiscifolius March collected in two mining areas in the state of Rio Grande do Sul, Brazil, were submitted to CUS04 exposure tests to confrrm copper tolerance during germination.and plantule development. The results showed that the two distinct clones respond d.ifferently to copper, but both presented tolerance mechanisms. Plantules originated from seeds collected in the area with higher soil copper concentration (minas do Seival) presented toxicity symptoms later as compared to those plantules originated from seeds collected in the area with lower cu 2 + concentration (mina Sanga Negra).

Influence of soil properties on the abundance of plant species in ferruginous rocky soils vegetation, southeastern Brazil

“…In this type of substrate there are ecotypes adapted to high metal concentration in soil (Duvigneaud & DenaeyerDe Smet 1960, Antonovics et al 1971, Porto 1989, Köhl 1997, a low number of plant species and the presence of endemic species (Porto & Silva 1989, Silva & Rosa 1990. The metallophile vegetation is characterized by individuals with high concentrations of heavy metals in their tissues and occasionally by dwarf or giant ecotypes (Porto & Silva 1989).…”

Phytosociological studies on natural establishment of vegetation in an unreclaimed limestone mining

“…In despite continued attempts at artificial revegetation, little is known about the processes that accompany result natural revegetation of mined sites with pioneer plants, which represent a important knowledge about reclamation of the mining (Roberts et al 1981;Kimmerer, 1984;Greller et al, 1990;Dias et al 1994;Gisler, 1995). There are no studies from the phytosociological angle, particularly in tropical region (Simões et al, 1978;Griffith, 1980;Porto, 1989;Motta Netto et al, 1994). A phytosociological study enables one to know about distribution of species as wel as affinities between species or group of species, resulting in a valuable evaluation of the vegetation.…”