Analysis of genetic variability of aluminium tolerance response in triticale |
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| Authors: | Xianguang Zhang Robin S Jessop |
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| Institution: | (1) Division of Agronomy and Soil Science, Faculty of the Sciences, University of New England, Armidale, NSW, 2351, Australia |
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| Abstract: | Comparative analyses of genetic variability of aluminium tolerance response were made in a range of triticale genotypes of
two sets, one consisting of six Australian cultivars (or lines), the other consisting of eight South African lines and an
Australian check, by following solution culture and screening under controlled growth cabinet conditions. Results showed that
Tahara, Tahara ‘S’ and Abacus were the most Al-tolerant triticales among the Australian genotypes in terms of root regrowth
characteristics at 10 μg.g-1 Al. The 19th ITSN 70-4, along with the standard cultivar Tahara was superior to all other South African genotypes; the eight
South African genotypes spanned the range from Al-tolerant, moderately Al-tolerant to Al-sensitive. Regrown root length and
percentage of seedlings with root regrowth were the two key indicators for screening and evaluating Al tolerance response.
Considerable genetic variability of tolerance to Al stress among the two sets of tested genotypes was revealed by the estimates
of genetic parameters. High heritability values were recorded for those two indicators, with associated high levels of relative
genetic advance (RGA). Further improvement of varietal tolerance to Al stress in triticale could be anticipated through selection
and breeding.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | alumunium stress breeding genetic variability root regrowth tolerance response triticale (Triticosecale Wittmack) |
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