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Title of Journal: Euphytica

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Abbravation: Euphytica

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Springer Netherlands

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DOI

10.1002/cber.18940270140

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1573-5060

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Semidominant genes confer additive tolerance to m

Authors: Ping Si Gang Pan Mark Sweetingham
Publish Date: 2010/10/20
Volume: 177, Issue: 3, Pages: 411-418
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Abstract

Narrowleafed lupin Lupinus angustifolius L is a grain legume welladapted to sandy acid soils in a Mediterranean climate Improved metribuzin tolerance in lupin cultivars is considered essential to protect crops from herbicide damage in Australia This paper reports on the inheritance of metribuzin tolerance in two induced mutants TanjilAZ33 and TanjilAZ55 over the susceptible wild type cv Tanjil Both mutants were highly tolerant to 800 g/ha metribuzin with no foliage damage but cv Tanjil died and reciprocal F1 hybrids had intermediate tolerance with foliage damage The F2 populations of both crosses TanjilAZ33 × Tanjil and TanjilAZ55 × Tanjil had a segregation ratio of 121 for highly tolerant damageddead plants Progeny tests F3 of selected F2 single plants confirmed that highly tolerant F2 plants were homozygous and damaged F2 plants were heterozygous Clearly a single semidominant gene conferred metribuzin tolerance in both mutants An allelism test revealed that the two mutants had two nonallelic tolerance genes with F2 plants segregating in a 151 ratio for survival and death at 800 g/ha metribuzin The tolerance gene in TanjilAZ33 was designated as Mt3 and the gene in TanjilAZ55 as Mt5 At 4000 g/ha metribuzin 1/16 of F2 plants from the cross between the two mutants had no herbicide damage suggesting the additive effects of the two tolerance genes whilst the rest were damaged or dead Combining these two tolerance genes Mt3 and Mt5 increased tolerance further by approximately fivefoldThis research was funded by the Grains Research and Development Corporation GRDC of Australia GP was awarded an Australian Endeavour PostDoc Fellow at CLIMA for 6 months We are grateful to John Quealy for his technical support and Prof Erskine for his comments on an earlier version

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