Data/hora: 11/06/2024 07:17:43

Provedor de dados: 	88	
País: 	Brazil	
Título: 	The post-fire effects on the outcrossing rate of a Brazilian savannah shrub, Helicteres sacarolha A.St.-Hil	
Autores: 	Franceschinelli,Edivani Villaron; Bawa,Kamaljit S.	
Data: 	2005-03-01	
Ano: 	2005	
Palavras-chave: 	Cerrado; Flower density; Helicteres; Plant outcrossing rate; Post-fire effect.	
Resumo: 	The effect of post-fire, plant density and number of flowers per plant on outcrossing rates was examined in a Brazilian savannah shrub, Helicteres sacarolha. Data on number of flowering plants and flowers per plant were collected during the flowering season in January and February of 1994. In October of 1994, a fire swept through the studied area after 30 years of fire absence. The burnt plants of H. sacarolha resprouted, producing flowers and fruits in 1995. Seeds from several plants in both years were collected. Allozyme markers were used to estimate the multilocus outcrossing rates for 1994 and 1995 progenies. After the fire, outcrossing rates increased. In 1995, plants flowered vigorously, increasing flower density and probably pollinator activity. Helicteres sacarolha seems to be fire resistant, like other plant species of the Brazilian savannah, but several plants tagged in 1994 were not found after the fire, and may have died. Thus, although genetic diversity and outcrossing rates increased following the fire in 1994, repeated events of fire may decrease drastically the population size of H. sacarolha, leading to a diminished genetic diversity and outcrossing rates.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042005000100013	
Editor: 	Sociedade Botânica de São Paulo	
Relação: 	10.1590/S0100-84042005000100013	
Formato: 	text/html	
Fonte: 	Brazilian Journal of Botany  v.28 n.1 2005	
Fonte: 	info:eu-repo/semantics/openAccess