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Volume 4, Issue 3 (Suppl) Adv Crop Sci Tech
ISSN: 2329-8863 ACST, an open access journal
Page 63
Notes:
Plant Genomics 2016
July 14-15, 2016
conferenceseries.com
July 14-15, 2016 Brisbane, Australia
4th International Conference on Plant Genomics
Genetics of root-lesion nematode resistance in wheat: A review
Rebecca S Zwart
University of Southern Queensland, Australia
Root-lesion nematodes (RLN) are one of the most widespread and devastating plant parasitic nematodes species globally. In
Australia, RLN species Pratylenchus thornei and P. neglectus are particularly important biotic constraints to wheat production. The
most efficient and effective strategy for improving on-farm RLN management relies on providing wheat growers with cultivars with
better levels of resistance to RLN to ensure high yields and reduce the build-up of nematode populations to invade subsequent crops.
Current research efforts in Australia are focused on the genetic characterization and introgression of superior sources of resistance
into commercial wheat cultivars. Studies on the inheritance of P. thornei resistance in wheat have revealed polygenetic and additive
gene action. Superior resistance has been identified from a wide range of backgrounds, including landrace and synthetic hexaploid
wheats (ABD genomes), and wild diploid (D and A genomes) and tetraploid (AB genomes) genome donors. Effective sources of
dual resistance to P. thornei and P. neglectus have been identified in synthetic hexaploid wheat. A single gene conferring resistance to
P. neglectus, Rlnn1, has been mapped to chromosome 7AL. QTL analysis in several bi-parental mapping populations has identified
major QTL for P. thornei resistance on chromosomes 2BS, 6DS and 7BL, which have been verified in sources of resistance from
diverse backgrounds. Genotyping-by-sequencing has provided closely linked flanking markers that are now available to Australian
breeders through the Australian Wheat and Barley Program to implement marker-assisted selection. Further fine mapping using
large segregating populations will allow map-based cloning approaches to identify candidate genes underlying these QTL for RLN
resistance.
Biography
Rebecca S Zwart has completed her PhD from University of Queensland, Australia on the genetics of root-lesion nematode resistance in wheat. She is a Senior
Research Fellow (Crop Nematology) at the University of Southern Queensland, Australia. She has held Postdoctoral positions investigating the genetics and nature
of inheritance of genes conferring host resistance to wheat diseases in Australia, Belgium and India.
Rebecca S Zwart, Adv Crop Sci Tech 2016, 4:3 (Suppl)