Data/hora: 14/06/2024 02:41:59

Biblioteca(s): 	Embrapa Mandioca e Fruticultura.	
Data corrente: 	09/09/1993	
Data da última atualização: 	10/09/2007	
Autoria: 	BROWN, A. H. D.	
Afiliação: 	CSIRO Division of Plant Industry, Canberra, Australia.	
Título: 	The case for core collections.	
Ano de publicação: 	0	
Fonte/Imprenta: 	Cambridge: Cambridge University Press [s. d.] p. 136-156.	
Idioma: 	Inglês	
Conteúdo: 	If collections of plant germplasm are to be used more in the future than they at present, then they will have to be better collections. This is the challenge of a new phase in the saga of genetic resources, and one which has led to several approaches. In other chapters, the importance of large collections, complete evaluation and expanding size, and the role of national collections, are considered. The thesis developed in this chapter is that a 'better' collection is one that is rationalised, refined and structured, around a small, well-defined and representative 'core'. The numbers and scope of accessions in a collection, the information about them and the access to them are factores often argued as crucial to the use of collections in plant breeding. Paradoxically, hower, the key to greater use may lie elsewhere. As recently pointed out (Frankel & Brown, 1984; Holden, 1984), germplasm collections have grown markedly in size, and may now be so large as to deter their extensive use for all but a few characters which are readily discerned on single plants (e.g. some morphological traits, chemical differences detectable by spot tests, and major genes for disease resistance). Greater use of germplasm collections could be made, particulary for a wider range of characters, if a smaller number of accession were to be given priority in evaluation and hybridisation.	
Palavras-Chave: 	Melhoramento genético.	
Thesagro: 	População; Triticum Turgidum; Variação Genética.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Mandioca e Fruticultura (CNPMF)	
Exemplares: 	CNPMF - (15322-1) - ADM - SP - -- - S5556 -  - S5556 - DIS