SciELO - Scientific Electronic Library Online

 
vol.69 issue1Phenotypic plasticity in two antarctic populations of Colobanthus quitensis (Caryophyllaceae) under a simulated global change scenarioFloristic study of the Francisco Coloane Coastal Marine Protected Area, Región de Magallanes, Chile author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Gayana. Botánica

On-line version ISSN 0717-6643

Abstract

ATALA, Cristian; SALDANA, Alfredo  and  NAVARRETE, Eduardo. Stomatal frequency and gas exchange differs in two Blechnum species (Pteridophyta, Blechnaceae) with contrasting ecological breadth. Gayana Bot. [online]. 2012, vol.69, n.1, pp.161-166. ISSN 0717-6643.  http://dx.doi.org/10.4067/S0717-66432012000100016.

In Chilean temperate forest, the fern Blechnum chilense has a wide ecological breath, but occur mainly in full sun habitats, while Blechnum mochaenum is restricted only to shady sites. We evaluated if the species with different ecological breath behave similarly in their anatomical and physiological traits. Maximal photosynthetic rate (Amax), Stomatal conductance (gs), evapotranspiration (E), and SLA (specific leaf area) were measured in situ in 20 individuals of each fern species. Additionally, we estimated the stomatal density (SD), stomatal index (SI), and stomatal size in leaves of each sampled individual. B. mochaenum, the shade-tolerant species, had lower SD, SI, A, and E, and higher stomatal size and SLA than B. chilense. Higher stomatal frequency could result in greater gas exchange in open sites for B. chilense. The leaf physiology of these fern species seems to depend partially on their stomatal traits.

Keywords : Blechnum; stomatal density; stomatal index; stomatal size; gas exchange; evergreen temperate forest.

        · abstract in Spanish     · text in English     · English ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License