A qualidade do solo afeta a germinação das sementes e o desenvolvimento das plântulas de Dimorphandra mollis Benth. (Leguminosae: Mimosoideae)

Abstract

ABSTRACT(Soil quality aff ects seed germination and seedling development of Dimorphandra mollis: Benth. (Leguminosae: Mimosoideae)). Th e exploitative collection of Dimorphandra mollis fruits by farmers has negatively aff ected the natural population dynamics of this species. Th e aim of this study was to compare the eff ects of three soil types (Cerrado sand soil, Cerrado clay soil and dry forest soil) on seed germination and seedling development of D. mollis. Th e seeds of D. mollis showed greater germinability in Cerrado sand soil (60.5%), followed by Cerrado clay soil (29.7%) and dry forest soil (13.6%). Th e seedling root growth in Cerrado sand soil was higher compared to Cerrado clay soil and dry forest soil. However, no diff erences were verifi ed for root dry mass between the soil treatments. Th e seedlings of D. mollis cultivated in dry forest soil presented a higher growth rate and total dry mass. Th ese results are probably associated with higher nutrient availability, which was verifi ed in the dry forest soil when compared to the Cerrado soils. Our results indicate that D. mollis seeds need a low water-retaining substrate to increase the germination rate and that seedlings develop better in nutrient-rich soils. A qualidade do solo afeta a germinação das sementes e o desenvolvimento das plântulas de Dimorphandra mollis Benth...

Intraspecific variation in seed size and light intensity affect seed germination and initial seedling growth of a tropical shrub

“…Seed size is also directly related to the amount of nutritional reserves that can be allocated to initial seedling development (Yanlong et al 2007;Souza & Fagundes 2014). In general, when compared to small seeds, larger seeds produce more vigorous seedlings (Gharoobi 2011;Fagundes et al 2011). Plant species that produce larger-sized seeds are favored in predictable and more competitive habitats (Baskin & Baskin 1998;Ferreira & Borghetti 2004), while plant species that produce a greater number of smaller seeds have greater competitive advantage, especially in early successional habitats (Baskin & Baskin1998;Moles & Westoby 2006;Rojas-Aréchiga et al 2013).…”

“…light, moisture, temperature, soil quality) in determining the success of seed germination and plant recruitment among habitats (Pearson et al 2003;Khan & Gulzar 2003;Yanlong et al 2007;Fagundes et al 2011). Small seeds generally germinate better in light than in darkness, while large seeds do not exhibit a difference in germination between these two conditions (Milberg et al 2000;Fenner & Thompson 2005).…”

Disponibilidade hídrica do substrato e teor de água da semente na germinação de niger1

“…Assim, a germinação de sementes é um processo crítico no ciclo de vida das plantas, sendo necessário encontrar condições ambientais que permitam o seu sucesso (Fagundes et al 2011). Para que isso ocorra, o processo germinativo depende do movimento da água através dos tecidos que envolvem a semente, permitindo que a hidratação provoque a retomada do seu metabolismo.…”

The role of historical and ecological factors on initial survival of Copaifera langsdorffii Desf. (Fabaceae)

“…In fact, larger seeds commonly produce more vigorous and resistant seedlings (Kidson & Westoby 2000;Green & Juniper 2004). However, the outcome of the interaction between seed size and seedling performance can be affected by microhabitat characteristics (Rey et al 2004;Baraloto & Forget 2007;Fagundes et al 2011). Therefore, seed size may be part of synchronized sets of plant life history traits, which govern the distribution of new seedlings in space and time (Moles et al 2005).…”