Resumo

FATTA, N.A  e  VASSALLO, S.A. ¿Es variable la respuesta de Zinnia peruviana al drenaje deficiente?: Polimorfismos poblacionales en Zinnia peruviana. BAG, J. basic appl. genet. [online]. 2011, vol.22, n.2, pp.64-71. ISSN 1852-6233.

An experiment was carried out in order to i) validate observations on Zinnia peruviana grown under excess water conditions, ii) compare the behavior of plants from three origins under two soil moisture regimes, and iii) select individuals to serve as substrates with impeded drainage. For the differentiation between origins and treatments, biomass production and ratios between stem and root dry weight and between stem and LDMC fresh and dry weight were analyzed. Seeds from Capilla del Monte, Villa Giardino and La Higuera (Córdoba Province, Republic of Argentina) were sown on October 10, 2008. On November 30, 2008, they were further transplanted into pots which either had good drainage (control) or remained with excess water during the experiment (treated). The design was factorial with three origins and two soil moisture treatments. Survival was observed to be highest in the plants from La Higuera and no treatment effects were found on this character. By November 1, 2009, there were no effects of independent variables as to the number of leaves, axillary buds, epicotyl length, nor for the LDMC determined on March 6, 2009. The ratio of dry weights of shoot and root showed a slight treatment effect on the treated plants. Results from this study indicate that plants were not damaged as a result of water excess in the substrate and that, on the contrary, extra water was favorable. Our aims could be successfully achieved by selecting individuals from the reference population which satisfactorily responded to the culture treatment chosen.

Palavras-chave : Leaf dry matter content; Stem-root ratio; Landscaping.

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