Data/hora: 08/06/2024 18:48:41

Provedor de dados: 	39	
País: 	Brazil	
Título: 	Self-sterility in the hexaploid Handroanthus serratifolius (Bignoniaceae), the national flower of Brazil	
Autores: 	Alves,Mariana Ferreira; Duarte,Mariana Oliveira; Oliveira,Paulo Eugênio; Sampaio,Diana Salles.	
Data: 	2013-12-01	
Ano: 	2013	
Palavras-chave: 	Apomixis; Late-acting self-incompatibility; Monoembryony; Polyploidy; Tabebuia serratifolia.	
Resumo: 	Polyploidization is common among angiosperms and might induce typically allogamous plants to become autogamous (self-compatible, relying on sexual self-fertilization) or apomictic (achieving asexual reproduction through seeds). This work aimed to determine whether neopolyploidy leads to the breakdown of the self-incompatibility system in the hexaploid non-apomictic species Handroanthus serratifolius (Vahl) S. Grose, through analyses of its floral biology, pollination biology and breeding system. Although anthesis lasted for three days, increasing the overall floral display, receptivity decreased as of the second day. Centridini and Euglossini bees were the main pollinators, and low nectar availability (1.95 ± 1.91 µl/flower) might have obliged them to visit multiple flowers. We observed low reproductive efficacy. That might be explained by self-sterility and by the great number of flowers per individual, which could increase the frequency of geitonogamy. Ovule penetration by the pollen tubes in self-pollinated pistils with posterior abscission indicated late-acting self-incompatibility in H. serratifolius, as observed in other diploid Bignoniaceae species, although inbreeding depression cannot be excluded. The self-sterility found in the monoembryonic, hexaploid individuals studied here contrasts with the results for other neopolyploid Handroanthus and Anemopaegma species, which are often autogamous and apomictic. Our results suggest that neopolyploidy is not the main factor leading to self-fertility in Handroanthus.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000400010	
Editor: 	Sociedade Botânica do Brasil	
Relação: 	10.1590/S0102-33062013000400010	
Formato: 	text/html	
Fonte: 	Acta Botanica Brasilica  v.27 n.4 2013	
Fonte: 	info:eu-repo/semantics/openAccess