@article {44,
	title = {Effects of aluminium toxicity and low pH on the early development of iso{\"e}tes echinospora},
	journal = {Preslia},
	volume = {81},
	year = {2009},
	note = {Cited By (since 1996):5Export Date: 11 November 2013Source: Scopus},
	month = {2009///},
	pages = {135 - 149},
	abstract = {A relict population of Iso{\"e}tes echinospora Durieu survived a thirty-year period of severe acidification and high concentrations of phytotoxic aluminium (Al) in Ple{\v s}n{\'e} Lake (Bohemian Forest, Czech Republic). The population consisted of only adult plants. Sporeling survival and age structure were examined during the population recovery in 2004-2008. Laboratory experiments were conducted to assess the effect of various pH values (4-8) and Al concentrations (0-1000 μgl -1) on sporeling development. The responses of the sporelings to the experimental treatments were evaluated and compared with those observed in the lake. The experiments showed that an Al concentration higher than 300 μgl- 1 , and high acidity (pH 4), inhibit sporeling growth, in particular resulted in a pronounced reduction in absorptive organs (macrogametophyte rhizoids, roots and root hairs). With increasing concentrations of Al and at pH 4, the ratio of the below-ground to above-ground sporeling biomass decreased to less than 1. The responses of the lake sporelings, rooting in the upper sediment layer, were similar to those exposed to 100-300 μgl -1 of Al in the laboratory, and reflected the Al toxicity of the lake water. The quillworts at Ple{\v s}n{\'e} Lake survived because adult plants can tolerate these adverse conditions and are very long-lived. The population recovered when the pH of the water increased to over 5 and the Al concentration decreased to below 300 μgl- 1 .},
	keywords = {Acidification, Demography, Iso{\"e}tes echinospora, Quillwort, Recovery, Reproduction, Sporeling},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-68249099192\&partnerID=40\&md5=9b6556ca288bc4b4849c6e259815eaca},
	author = {{\v C}tvrtl{\'\i}kov{\'a}, M. and Vrba, J. and Znachor, P. and Hekera, P.}
}
