Triticale breeding

Gregory, R. S.

doi:10.1007/978-94-009-3131-2_9

Cited by 9 publications

(3 citation statements)

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“…Another route could be to develop the amphiploids as a new salt-tolerant crop, 'tritipyrum', in the same way as triticale (Gregory 1987). Several tetraploid wheats, with chromosome 4D substituted for 4B, were hybridized with T. bessarabicum (King et al 1997b).…”

Section: Wide Hybridization For Salinity and Aluminium Tolerancementioning

confidence: 99%

Breeding for abiotic stresses for sustainable agriculture

Witcombe

Hollington

Howarth

et al. 2007

Phil. Trans. R. Soc. B

251

158

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Using cereal crops as examples, we review the breeding for tolerance to the abiotic stresses of low nitrogen, drought, salinity and aluminium toxicity. All are already important abiotic stress factors that cause large and widespread yield reductions. Drought will increase in importance with climate change, the area of irrigated land that is salinized continues to increase, and the cost of inorganic N is set to rise. There is good potential for directly breeding for adaptation to low N while retaining an ability to respond to high N conditions. Breeding for drought and salinity tolerance have proven to be difficult, and the complex mechanisms of tolerance are reviewed. Marker-assisted selection for component traits of drought in rice and pearl millet and salinity tolerance in wheat has produced some positive results and the pyramiding of stable quantitative trait locuses controlling component traits may provide a solution. New genomic technologies promise to make progress for breeding tolerance to these two stresses through a more fundamental understanding of underlying processes and identification of the genes responsible. In wheat, there is a great potential of breeding genetic resistance for salinity and aluminium tolerance through the contributions of wild relatives.

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Section: Wide Hybridization For Salinity and Aluminium Tolerancementioning

confidence: 99%

Breeding for abiotic stresses for sustainable agriculture

Witcombe

Hollington

Howarth

et al. 2007

Phil. Trans. R. Soc. B

251

158

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“…This has become popular in recent years due to the observation that synthetics and hybrids often show greater tolerance than genetic lines derived from them. However, the wheat/rye hybrid, triticale (AABBRR) has been developed as a major cereal crop by such efforts (see Gregory 1987). squarrosa (DD) (Schachtman et al 1991).…”

Section: Synthetics and Hybridsmentioning

confidence: 99%

Genetic engineering for stress tolerance in the Triticeae

Forster¹

1992

Proc., Sect. B Biol. sci.

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SynopsisGenetic variation within a crop species is often limited and restricts improvement by conventional breeding methods. This is particularly true for environmental stresses, both biotic and abiotic. Wild relatives of crop plants, however, provide a rich source of novel variation which can be introduced into the crop. Many alien genes for biotic stress resistance have already been introduced into crops; in contrast, the genetic control of abiotic stress tolerance is poorly understood. Genetic engineering of abiotic stress tolerance in the Triticeae is the main subject discussed here with particular reference to salt tolerance in wheat and barley. Methods of alien gene transfer, including locating tolerance genes and restructuring chromosomes, are described. One of the major limitations in transferring genes for stress tolerance is the lack of good tests for resistance or tolerance which is largely due to the fact the physiological mechanisms involved are not fully understood. Genetic markers provide a new opportunity of detecting chromosome segments carrying desired genes easily and efficiently, and these will become increasingly important as the genetic maps of crop species are expanded. Although many stress genes have been located to specific chromosomes, and some have been mapped intra-chromosomally and their dominance relations determined, there is a great lack of knowledge of the control of these genes at the molecular level. Molecular studies of this type are difficult, but it is anticipated that the limitations will be overcome in the near future.

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“…The tribe Triticeae contains three of the major cereals -barley, rye and wheat -being used by humankind since prehistoric times, as well as the first and unique man made cereal Triticale. Octoploid (2n = 8x = 56, AABBDDRR) and hexaploid (2n = 6x = 42, AABBRR) triticale are obtained crossing hexaploid wheat and rye (2n = 6x = 42, AABBDD x 2n = 2x = 14, RR) or tetraploid wheat and rye (2n = 4x = 28, AABB x 2n = 2x = 14, RR) (Gregory, 1987). Several other members of this tribe are also important as forage and pasture grasses (Miller, 1987).…”

Section: Introductionmentioning

confidence: 99%