Data/hora: 21/06/2024 22:30:04

Biblioteca(s): | Embrapa Cerrados; Embrapa Trigo.
Data corrente: | 18/12/1995
Data da última atualização: | 26/09/2016
Autoria: | MINELLA, E.
Título: | Aluminum tolerance in barley: inheritance, chromosome location, genetic relationship of sources of diverse origins, and breeding implications.
Ano de publicação: | 1989
Fonte/Imprenta: | [Ithaca]: Cornell University, 1989.
Páginas: | 70 p.
Idioma: | Inglês
Notas: | Dissertation PhD.

Conteúdo:

The current information available on Al tolerance in barley can be summarized as follows: 
Although barley is best adapted to high pH soils, differential tolerance to low soil pH and/or Al among genotypes has been documented. Simple and reliable screening assays have been developed and have been important tools genetic and breeding research. 
The upper tolerance level available in cultivated barley is very low compared to wheat and rye, and still too low for satisfactory crop production under the Al stress conditions commonly found in acid soils of some important cropping areas of the world. It is believed that higher tolerance levels will very likely improve both grain yield and yield stability in those areas. Differential tolerance to Al and to low soil pH among genotypes was determined to be genetically controlled and simply inherited in two studies. In both, tolerance was dominant and inherited as a single gene. Minor gene effects on toletance were suggested in one study. Since only a limited number of genotypes were genetically analyzed, it is not known whether or not tolerance is under the same single genetic control throughout the range of tolerance so far identified. Tolerance to low soil pH in one genotype was associates with a morphological marker on chromosome 4, whereas tolerance to Al has not been associated to specific chromosome. 
The mechanisms of tolerance is sill not understood but available information favors the hypothesis of an exclusion mechanism operating at the plasma membrane. Tolerance to low soil pH and to Al tolerance are probably due to the same mechanism. 
The lack of information on the allelic relationship among tolerance sources of diverse origins, prevent assessment of the potencial for breeding cultivars more tolerant to Al than those currently available, through genetic manipulation of additive non-allelic genes. 
The objetives as well the results of these studies are presented and discussed in following three separate chapters. 
Inheritance of aluminum tolerance in barley.
Trisomic analysis of tolerance to aluminum.
Genetic relationships among sources of aluminum tolerance of diverse origins and breeeding implications,

Palavras-Chave: | Genetic inheritance; Herediritariedade; Melhoramento genético; Melhoramento gentico.
Thesagro: | Alumínio; Cevada; Genética; Hereditariedade; Hordeum Vulgare; Toxidez.
Thesaurus Nal: | barley; plant breeding; toxicity.
Categoria do assunto: | --
Registro original: | Embrapa Trigo (CNPT)

Exemplares:

CPAC - (15989-1) - ADD - TS - -- - T018/89 - MIN - T018/89 - DIS
CNPT - (30216-1) - UPC - TS - -- - TS-0636 -  - 0636 - DIS