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|Title:||Differential responses to selection for aluminium stress tolerance in triticale||Contributor(s):||Zhang, XG (author); Jessop, RS (author); Ellison, F (author)||Publication Date:||2002||DOI:||10.1071/AR01187||Handle Link:||https://hdl.handle.net/1959.11/637||Abstract:||A directional selection program was initiated to select triticale genotypes with improved aluminium (Al) tolerance and presumably acid-stress tolerance. Two consecutive cycles of 2-way selection for either high or low apparent Al tolerances from a base population, Tahara, resulted in the production of 6 selected lines, whose progenies were tested for Al tolerance response in terms of root regrowth characteristics in nutrient solutions to assess selection effectiveness. In addition, 1 cycle of 2-way selection from 2 other base populations, Empat and 19th ITSN 70-4, resulted in 4 selected lines.Selective responses differed among selected lines, depending largely on the direction of the selection made and, to a lesser extent, on the genetic background of the original population. Upward selection for longer root regrowth produced progeny with more highly Al-tolerant plants. Although varying estimates of realised heritability were generated, the 2 cycles of upward selection resulted in an enhanced Al tolerance of 14.5% in the progeny A9701 derived from the base population Tahara. These results suggest that directional selection based on longer root regrowth in nutrient solutions was effective in improving Al tolerance. A pot-culture experiment showed that the second selection generation (S2) Al-tolerant lines were more productive than their moderately Al-tolerant counterparts, further implicating the effectiveness of directional selection in enhancing Al stress tolerance and plant productivity.||Publication Type:||Journal Article||Source of Publication:||Australian Journal of Agricultural Research, 53(12), p. 1295-1303||Publisher:||CSIRO Publishing||Place of Publication:||Australia||ISSN:||0004-9409||Field of Research (FOR):||070308 Crop and Pasture Protection (Pests, Diseases and Weeds)||Peer Reviewed:||Yes||HERDC Category Description:||C1 Refereed Article in a Scholarly Journal||Statistics to Oct 2018:||Visitors: 274
|Appears in Collections:||Journal Article|
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