Use of Triticum tauschii to improve yield of wheat in low-yielding environments

Triticum tauschii (Coss.) Schmal. is an ancestor of bread wheat (T. aestivum). This species has been widely used as a source ofsimply-inherited traits, but there are few reports of yield increases due tointrogression of genes from this species. Selections from F^sub 2^-derivedlines of backcross deri...

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Bibliographic Details
Published in:Euphytica 2002, Vol.123 (2), p.241-254
Main Authors: GORORO, N. N, EAGLES, H. A, EASTWOOD, R. F, NICOLAS, M. E, FLOOD, R. G
Format: Article
Language:English
Subjects:
Adaptation to environment and cultivation conditions
Agronomy. Soil science and plant productions
Biological and medical sciences
Crop yield
Drought
Fundamental and applied biological sciences. Psychology
Genetics and breeding of economic plants
Grain growth
Heat tolerance
introgression
Triticum aestivum
Triticum tauschii
Varietal selection. Specialized plant breeding, plant breeding aims
Wheat
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Summary:Triticum tauschii (Coss.) Schmal. is an ancestor of bread wheat (T. aestivum). This species has been widely used as a source ofsimply-inherited traits, but there are few reports of yield increases due tointrogression of genes from this species. Selections from F^sub 2^-derivedlines of backcross derivatives of synthetic hexaploid wheats (T.turgidum / T. tauschii) were evaluated for grain yield in diverseenvironments in southern Australia. Re-selections were made in theF^sub 6^ generation and evaluated for grain yield, yield componentsincluding grain weight, and grain growth characters in diverse environmentsin southern Australia and north-western Mexico. Re-selection was effectivein identifying lines which were higher yielding than the recurrent parent,except in full-irrigation environments. Grain yields of the selectedderivatives were highest relative to the recurrent parent in thelowest-yielding environments, which experienced terminal moisture deficitand heat stress during grain filling. The yield advantage of the derivativesin these environments was not due to a change in anthesis date orgrain-filling duration, but was manifest as increased rates of grain-filling andlarger grains, indicating that T. tauschii has outstanding potential forimproving wheat for low-yielding, drought-stressed environments.[PUBLICATION ABSTRACT]
ISSN:0014-2336
1573-5060
DOI:10.1023/A:1014910000128