Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/118933
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Type: Journal article
Title: Development of high levels of metribuzin tolerance in lentil
Author: McMurray, L.
Preston, C.
Vandenberg, A.
Mao, D.
Oldach, K.
Meier, K.
Paull, J.
Citation: Weed Science, 2019; 67(1):83-90
Publisher: Cambridge University Press; Weed Science Society of America
Issue Date: 2019
ISSN: 0043-1745
1550-2759
Statement of
Responsibility: 
Larn S. McMurray, Christopher Preston, Albert Vandenberg, Dili Mao, Klaus H. Oldach, Kendra S. Meier and Jeffrey G. Paull
Abstract: Lentil (Lens culinaris Medik.) is an important and expanding crop in southern Australia and a significant crop in western Canada. Currently, production in both countries is limited by an inability to effectively control weeds, due in part to a lack of registered safe and effective herbicides. Metribuzin is a broad-spectrum herbicide providing an alternative weed control option to the imidazolinones, but it has low crop safety in lentil. Two methods, germplasm screening using a hydroponic sand assay and field screening of a large mutated population of the Australian cultivar ‘PBA Flash’ were initially used to identify lines with putative metribuzin tolerance over current cultivars. Dose–response experiments showed the germplasm line SP1333 had GR₅₀ (the rate required to reduce dry weight 50%) values up to four times higher than PBA Flash. However, the mutation selections M043 and M009 had GR50 values more than 25 times higher than PBA Flash. A field study in Canada, under conditions of induced shade and no shade 72 h before POST application of metribuzin, confirmed the intermediate level of tolerance in SP1333 and the high level in the two mutant lines compared with 20 Canadian and Australian genotypes. This relative increase in metribuzin tolerance of the two mutant lines over the parent cultivar is higher than all previous reports in a range of crop species. The development of large mutant populations combined with large M2 field screens was a successful method for developing high levels of metribuzin tolerance in lentil. The estimated mutation rate of the mutant lines was 9.4×10⁻⁸. All three lines are currently being used as parents in lentil breeding programs.
Keywords: Germplasm screening; herbicide tolerance; mutagenesis; weed control
Rights: © Weed Science Society of America, 2018.
RMID: 0030108857
DOI: 10.1017/wsc.2018.57
Appears in Collections:Agriculture, Food and Wine publications

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