Producao de cevadas duplo-haploides.
1987
Gusmao L.
The present review concerns the production of doubled-haploid barley for plant breeding purposes. Some preliminary considerations about terminology suggest to restrict the terms "haploid" and "dihaploid" to individuals with the chromosomal constitution of their haplophase and diplophase, respectively. The number of genomes present should be referred separately and its integrity (or otherwise) should be referred by the traditional prefixes in the designation of the ploidy state; for instance, the genomic constitution of an individual with sporophytic composition equivalent to its haplophase, with two complete genomes, will be designated by "euhaploid diploid". Origin, utilization, production and recovery of doubled-haploid constitution, in general, is also discussed according to the evidence reported in the bibliography. Methods of doubled-haploid barley production, including the hap-gene method, androgenesis and gynogenesis in vitro, and the bulbosum method, are discussed, with particular emphasis in the last one, in view of its actual fruitfulness, but also stressing the method of androgenesis in vitro in view of its greater potential. No method should be considered as less convenient, as it may constitute the adequate alternative for particular genotypes (author).
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