Data/hora: 22/09/2024 20:38:54

Biblioteca(s): 	Embrapa Mandioca e Fruticultura.	
Tipo da produção científica: 	Resumo em Anais de Congresso	
Data corrente: 	07/10/2008	
Data da última atualização: 	19/02/2009	
Autoria: 	VIDAL, M.; FERNANDES, L.; TAVARES FILHO, L.; SANTOS-SEREJO, J.; ALVES, A.	
Afiliação: 	Maria Vidal, UFRB; Lilian Fernandes, UNEB; Leonidas Tavares Filho, FAPESB; Janay Almeida dos Santos-Serejo, CNPMF; Alfredo Augusto Cunha Alves, CNPMF.	
Título: 	Preliminary studies on pollen production and viability in wild relatives and cultivated cassava.	
Ano de publicação: 	2008	
Fonte/Imprenta: 	In: SCIENTIFIC MEETING OF THE GLOBAL CASSAVA PARTNERSHIP, 1., 2008, Ghent. Cassava: meeting the challenges of the new millennium. Ghent:: IPBO, 2008. p. 62.	
Idioma: 	Inglês	
Notas: 	SP03-15.	
Conteúdo: 	Cassava wild species are important sources of useful genes for cassava breeding programs. However, little is know about crossing compatibility among different Manihot species. To better understand the process from pollination to seed production, this work aimed to evaluated the genetic variation of some pollen characteristics which are very correlated to pollination efficiency. Preliminary studies have been carried out in wild and cultivated cassava species to estimate the potential of production of pollen grains and their viability for crossing. In a working collection of Manihot species at Embrapa/CNPMF, anthers from male flowers of different species were randomly collected just before the anthesis and stored in ethanol: acetic acid (3:1) for viability analysis or in ethanol 70% for pollen counting. Pollen viability was estimated by the carmine staining method and pollen production was determined using the counting of pollen grains suspension in glycerol 50%. The diameter of pollen grain was also estimated by micrometric slide method. All the evaluated parameters showed genotypic differences as much among wild species as among cassava varieties. The pollen production varied from 1056 to 2692 grains per flower. In general the wild species produced more pollen than M. esculenta. The pollen diameter varied from 128 to 169 micrometers with the smaller values found in wild species. The highest diversity was found in pollen viability varying from 47% to 97%. These preliminary results revealed that the studied parameters have a large variability within Manihot germplams. Futher detailed studies aiming the correlation between these parameters and crossing compatibility are currently underway.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Mandioca e Fruticultura (CNPMF)