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

Gororo, N.N. and Eagles, H.A. and Eastwood, R.F. and Nicolas, M.E. and Flood2, R.G. (2002) Use of Triticum tauschii to improve yield of wheat in low-yielding environments. Euphytica, 123 (2). pp. 241-254.

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Triticum tauschii (Coss.) Schmal. is an ancestor of bread wheat (T. aestivum). This species has been widely used as a source of simply-inherited traits, but there are few reports of yield increases due to introgression of genes from this species. Selections from F2-derived lines of backcross derivatives of synthetic hexaploid wheats (T. turgidum / T. tauschii) were evaluated for grain yield in diverse environments in southern Australia. Re-selections were made in the F6 generation and evaluated for grain yield, yield components including grain weight, and grain growth characters in diverse environments in southern Australia and north-western Mexico. Re-selection was effective in identifying lines which were higher yielding than the recurrent parent, except in full-irrigation environments. Grain yields of the selected derivatives were highest relative to the recurrent parent in the lowestyielding environments, which experienced terminal moisture deficit and heat stress during grain filling. The yield advantage of the derivatives in these environmentswas not due to a change in anthesis date or grain-filling duration, but was manifest as increased rates of grain-filling and larger grains, indicating that T. tauschii has outstanding potential for improving wheat for low-yielding, drought-stressed environments.

Item Type: Article
Uncontrolled Keywords: Drought, grain-filling, synthetic hexaploids, Triticum tauschii, T. turgidum, wheat, yield
Author Affiliation: Joint Centre for Crop Improvement, Institute of Land and Food Resources, The University of Melbourne, Private Bag 260, Horsham, Vic. 3401
Subjects: Plant Production
Divisions: Other Crops
Depositing User: Mr T L Gautham
Date Deposited: 21 Aug 2018 04:31
Last Modified: 21 Aug 2018 04:31

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