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Key factors affecting seed germination of Copaifera langsdorffii, a Neotropical tree Acta Botanica
Souza,Matheus Lopes; Silva,Dávila Regina Pacheco; Fantecelle,Laura Bubantz; Lemos Filho,José Pires de.
In natural conditions biotic and abiotic factors interact, synergistically affecting seed germination. In this study, we experimentally simulated natural conditions that occur during seed dispersal that can affect the germination of Copaifera langsdorffii. Specifically we evaluated the effect of aril removal by different dispersal agents (birds and ants) and fire on germination. The seeds were submitted to the following treatments: Control (seeds placed to germinate with aril intact); Acid (simulation of passage through the digestive tract of a bird); Aril removal (simulation of aril removed by ants); Fire (seeds exposed to fire). Germination percentage and time varied among treatments (X²=89.735, P<0.001; X²=16.225, P<0.001, respectively). None of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cerrado; Copaifera langsdorffii; Fire; Plant-disperser interaction; Seed germination.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000400473
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Hemiparasitism effect on Baccharis dracunculifolia DC. and consequences to its major galling herbivore Acta Botanica
Bahia,Thaise de Oliveira; Zúñiga,Irene Gélvez; Souza,Matheus Lopes; Coutinho,Etiene Silva; Quesada,Mauricio; Fernandes,G. Wilson.
ABSTRACTMistletoes obtain nutrients and water from their hosts, with varying effects among those hosts. We assessed the factors that influence the colonization of the mistletoe Struthanthus flexicaulis on Baccharis dracunculifolia and the subsequent effects on host performance. We evaluated the incidence of S. flexicaulis according to size (height classes) and architecture of the host as well as its effects on various physiological parameters of the host. Furthermore, we assessed the occurrence of insect galls induced by Baccharopelma dracunculifoliae(Psyllidae), including the number of leaves infected, and the mortality of infected and non-infected branches. Taller hosts had a higher abundance of mistletoes (60%, p> 0.05). Physiological parameters of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Baccharopelma dracunculifoliae; Insect galls mistletoe rupestrian grasslands; Struthanthus flexicaulis.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000300339
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