Intrapopulational genetic diversity of Araucaria angustifolia (Bertol.) Kuntze is different when assessed on the basis of chloroplast or nuclear markers

Genetic analysis of 50-year old Brazilian pine (Araucaria angustifolia) plantations: implications for conservation planning

“…High fixation index estimates in adults are usually interpreted as a result of inbreeding in the population. Significant positive F values were not recorded for A. angustifolia populations in Mantovani et al (2006) and Patreze and Tsai (2010) studies. However, positive and significant F values have been reported in other studies of natural A. angustifolia populations (Auler et al 2002;Bittencourt and Sebbenn 2007;Schmidt et al 2007;Bittencourt and Sebbenn 2008;Stefenon et al 2008b).…”

“…The observed high F values for adults in this study suggest that the parent populations, from which the seeds were collected, were genetically structured thus increasing the probability of mating among relatives. Mating among relatives was reported in studies examining the mating system of A. angustifolia (Sousa et al 2005;Mantovani et al 2006;Sebbenn 2007, 2008) which is possibly due to near-neighbor pollination and seed dispersal close to the seed tree (Mantovani et al 2006;Sebbenn 2007, 2008;Stefenon et al 2008b;Patreze and Tsai 2010). The seeds of A. angustifolia are heavy and are primarily dispersed by autochory (Carvalho 2003) which can produce spatial genetic structure (SGS).…”

“…In this context, the protection of the genetic resources of A. angustifolia depends mainly on an understanding the genetic diversity that exists in remaining populations. Several surveys have investigated the status of genetic diversity for A. angustifolia populations (Auler et al 2002;Guerra et al 2002;Sousa et al 2004;Salgueiro et al 2005;Mantovani et al 2006;Sebbenn 2007, 2008;Guerra et al 2008;Patreze and Tsai 2010); however, little is known about the genetic diversity of planted Araucaria populations.…”

“…About 200 adult and 200 juvenile individuals (at least 50 individuals per population) were sampled at 50 m intervals to avoid sampling from related individuals, due to the presence of intra-population spatial genetic structure detected in forest fragments (Bittencourt and Sebbenn 2007) as well as in natural populations of the species (Mantovani et al 2006;Bittencourt and Sebbenn 2008;Stefenon et al 2008a;Patreze and Tsai 2010). Samples were kept cool in individually labeled plastic bags whilst in the field.…”

The stomatal CO2 proxy does not saturate at high atmospheric CO2 concentrations: evidence from stomatal index responses of Araucariaceae conifers

“…The genus Agathis is systematically confused, particularly in areas such as New Caledonia where multiple species co-occur (Page 1980;Whitmore and Page 1980;Setoguchi et al 1998). Analysis of the morphology of reproductive structures is required for systematic species determination in the genus Agathis, and phylogenetic DNA analysis is often unable to discern species (Setoguchi et al 1998;Farjon 2008;Patreze and Tsai 2010). The only Agathis species that can be reliably identified on the basis of leaf morphology alone (due to its smaller and thicker broad lance-shaped leaves) is Agathis australis, which grows isolated from other Agathis species in subtropical areas of New Zealand (Seward and Ford 1906;Page 1980).…”