A5038056357- Weed Control and Herbicide Applications
- Pesticide and Herbicide Environmental Studies
- Agronomic Practices and Intercropping Systems
- Legume Nitrogen Fixing Symbiosis
- Turfgrass Adaptation and Management
- Plant tissue culture and regeneration
- Bioenergy crop production and management
- Nematode management and characterization studies
- Plant Virus Research Studies
- Seed Germination and Physiology
- Genetically Modified Organisms Research
- Fungal Plant Pathogen Control
- Plant Disease Resistance and Genetics
- Biological Control of Invasive Species
- Soybean genetics and cultivation
- Plant Molecular Biology Research
- Plant Disease Management Techniques
- Forest Management and Policy
- Pasture and Agricultural Systems
- Plant and animal studies
- Plant Pathogens and Resistance
- Ubiquitin and proteasome pathways
- Wildlife Ecology and Conservation
- Plant Reproductive Biology
- Bioinformatics and Genomic Networks
The University of Adelaide
2016-2025
Australian Wine Research Institute
2018-2023
Abstract Weeds are attractive models for basic and applied research due to their impacts on agricultural systems capacity swiftly adapt in response anthropogenic selection pressures. Currently, a lack of genomic information precludes elucidate the genetic basis rapid adaptation important traits like herbicide resistance stress tolerance effect evolutionary mechanisms wild populations. The International Weed Genomics Consortium is collaborative group scientists focused developing resources...
Abstract BACKGROUND Glyphosate is the most widely used herbicide in world and has been intensively to control B. diandrus, a problematic weed of crops pastures southern Australia. RESULTS Resistance glyphosate was identified two populations diandrus that were nearly fivefold more resistant than wild‐type plants. Both contained EPSPS gene amplification, with plants having an average around 20‐fold number copies compared susceptible expression also increased both populations; however, levels...
Five glyphosate-resistant populations of Chloris truncata originally collected from New South Wales were compared with one susceptible (S) population Australia to confirm glyphosate resistance and elucidate possible mechanisms resistance.Based on the amounts required kill 50% treated plants (LD50 ), (GR) was confirmed in five C. (A536, A528, T27, A534 A535.1). GR 2.4-8.7-fold more resistant accumulated less shikimate after treatment than S plants. There no difference absorption translocation...
The natural auxin indole-3-acetic acid (IAA) is a key regulator of many aspects plant growth and development. Synthetic herbicides such as 2,4-D mimic the effects IAA by inducing strong auxinic-signaling responses in plants. To determine mechanism resistance Sisymbrium orientale (Indian hedge mustard) weed population, we performed transcriptome analysis 2,4-D-resistant (R) -susceptible (S) genotypes that revealed an in-frame 27-nucleotide deletion removing nine amino acids degron tail (DT)...
Abstract BACKGROUND A deletion mutation in the degron tail of auxin coreceptor IAA2 was found to confer resistance herbicide 2,4‐D Sisymbrium orientale . Given importance signalling plant development, this study conducted investigate whether may affect fitness. RESULTS The F 2 progeny crosses with two resistant populations P2 (P2♂ × S♀) and P13 (P13♂ were used study. plants grown under competition wheat pot‐trials evaluated for biomass total seed production. Progeny phenotyped by application...
Glyphosate is widely used for weed control in the grape growing industry southern Australia. The intensive use of glyphosate this has resulted evolution resistance rigid ryegrass. Two populations ryegrass from vineyards, SLR80 and SLR88, had 6- to 11-fold dose-response studies. These levels were higher than two previously well-characterized glyphosate-resistant (SLR77 NLR70), containing a modified target site or reduced translocation, respectively. Populations SLR88 accumulated less...
Summary Resistance to the acetyl‐coenzyme A carboxylase ( ACC ase)‐inhibiting herbicides in L olium rigidum is widespread grain cropping areas of S outh ustralia. To better understand occurrence and spread resistance these how it has changed with time, carboxyl transferase CT ) domain ase gene from resistant . plants, collected both random surveys mid‐north outhern ustralia over 10 years as well stratified individual fields, was sequenced target site mutations characterised. Amino acid...
Abstract BACKGROUND Echinochloa colona is an important summer‐growing weed species in cropping regions of northern Australia that has evolved resistance to glyphosate owing intensive use this herbicide summer fallow. RESULTS Pot trials conducted at 20 and 30 °C on six E. populations showed a significant increase the level resistant compared with °C. However, there was no influence growth temperature susceptibility sensitive population. Sequencing target‐site gene ( EPSPS ) identified...
Abstract BACKGROUND A population of Sisymbrium orientale from South Australia has multiple resistance to auxinic herbicides and inhibitors acetohydroxyacid synthase ( AHAS ). Inheritance 2,4‐D chlorsulfuron was studied in this population. RESULTS Crosses were made between seven resistant individuals as pollen donors susceptible individuals. Sixteen F 1 three crosses identified by their lack strong epinasty when treated with 200 g ha −1 . These selfed, segregation analysis the resulting...
Abstract BACKGROUND Glyphosate failed to control two populations of Hordeum glaucum (northern barley grass) along a fence line and around stockyards near Arthurton on the Yorke Peninsula, South Australia after more than decade regular use glyphosate. These were investigated confirm resistance determine mechanisms. RESULTS Dose–response experiments confirmed these glyphosate with levels 2.8–6.6‐fold compared susceptible populations. Shikimate assays less shikimate accumulation in resistant...
Abstract BACKGROUND Two oriental mustard populations (P2 and P13) collected from Port Broughton, South Australia were identified as resistant to 2,4‐D. The level of resistance, mechanism the mode inheritance for 2,4‐D resistance in these investigated. RESULTS Populations P2 P13 confirmed be at field rate (600 g a.e. ha −1 ). 81‐ 67‐fold more than susceptible (S1 S2) dose required 50% mortality (LD 50 ), respectively. No predicted amino acid modification was detected sequences potential...
Abstract The International Weed Genomics Consortium is a collaborative group of researchers focused on developing genomic resources for the study weedy plants. Weeds are attractive systems basic and applied research due to their impacts agricultural capacity swiftly adapt in response anthropogenic selection pressures. Our goal use information develop sustainable effective weed control methods provide insights about biotic abiotic stress tolerance assist crop breeding. Here, we outline under...
Populations of rigid ryegrass with resistance to glyphosate have started become a problem on fence lines cropping fields southern Australian farms. Seed plants that survived application were collected from two line locations in Clare, South Australia. Dose–response experiments confirmed these populations glyphosate. Both required 9- 15-fold higher dose achieve 50% mortality comparison standard susceptible population. The mechanism was investigated. Sequencing conserved region the gene...
Populations of rigid ryegrass suspected resistance to trifluralin due control failures exhibited varying levels susceptibility trifluralin, with 15 out 17 populations deemed resistant (>20% plant survival). Detailed dose–response studies were conducted on one highly field-evolved population (SLR74), known multiply (SLR31), and susceptible (VLR1). On the basis dose required kill 50% treated plants (LD 50 ), SLR74 had 15-fold greater than VLR1, whereas, SLR31 10-fold VLR1. Similarly, reduce...
Clethodim resistance was identified in 12 rigid ryegrass populations from winter cropping regions four different states of Australia. had failed to provide effective control these the field and suspected. Dose–response experiments confirmed clethodim butroxydim all populations. During 2012, LD 50 resistant ranged 10.2 89.3 g ha −1 , making them 3 34–fold more than susceptible population. Similarly, GR population varied 8 37.1 which is 13.9–fold higher In 2013, clethodim-resistant were 7.8...
Acetyl coenzyme A carboxylase (ACCase)-inhibiting herbicides affect fatty acid biosynthesis in plants and are widely used to control smooth hare barley dicot crops Australia. Recently, growers have experienced difficulty controlling with from this mode of action. Dose–response experiments conducted on five suspected resistant populations confirmed varying levels resistance quizalofop haloxyfop. The level these was greater than 27-fold 15-fold dose required reduce shoot biomass by 50% (GR 50...
Acetyl coenzyme-A carboxylase (ACCase) and/or acetolactate synthase (ALS) inhibitor resistance has been identified by herbicide screening in eight populations obtained from cropping regions of South Australia. This study aimed to quantify the level and characterise molecular basis ACCase ALS inhibitors these H. glaucum populations.H. Upper-North region were highly resistant (resistance index RI > 12) aryloxyphenoxypropionate (APP) herbicides quizalofop haloxyfop less (RI = 2-12)...
An oriental mustard population (P40) was identified as resistant to diflufenican by screening at the field rate. As and picolinafen both target phytoene desaturase (PDS), cross-resistance suspected. The mechanism of resistance its inheritance were investigated.At lethal dose (LD50 ) level, P40 237-fold more seven-fold compared two susceptible populations. Population also had a significantly higher (237-fold) than previously described P3 (143-fold). In addition Leu-498-Val mutation in PDS all...
In southern Australia, oriental mustard ( Sisymbrium orientale ) has been controlled successfully by triazine herbicides for several decades. The screening of 40 populations that were collected from the grain belt Australia during 2010 and 2013 resistance to six different (glyphosate, diflufenican, imazamox, chlorsulfuron, atrazine 2,4‐dichlorophenoxyacetic acid) identified two as highly resistant atrazine. Compared known mustard‐susceptible (S1 S2), these (P17 P18) near Horsham, Victoria,...
The perennial grass, Arundo donax , has shown potential as a promising biomass crop. However, it become invasive in number of areas and declared noxious weed some jurisdictions, making proposals to grow A. for commercial use A ustralia controversial. Evidence asexual reproduction the presence single genetic clone was investigated, such characteristics would indicate limited risk escape invasion. Using amplified fragment length polymorphism markers, diversity 218 samples from across examined....
As a result of extensive selection, two polyploid grass weeds, Hordeum glaucum (northern barley grass; 2n = 4x 28) and Bromus diandrus (ripgut brome; 8x 56), have evolved resistance to glyphosate, in Australia. Previous research suggested amplification 5-enolpyruvylshikimate-3-Phosphate synthase (EPSPS) gene confers these weed species. The objective this was investigate the genomic organization EPSPS species through molecular cytogenetic analyses fluorescence situ hybridization (FISH)...
Abstract Background Resistance to glyphosate has been reported in flaxleaf fleabane populations within a number of grain growing areas southern Queensland and northern New South Wales other cropping regions across Australia. Results To investigate the processes contributing evolution spread glyphosate-resistant fleabane, resistant tested dose-response experiments varied their responses from two eight times recommended rate. The different dose obtained may indicate mechanisms resistance. This...
In Australia, the extensive use of clethodim for control Lolium rigidum has resulted in evolution many clethodim-resistant L. populations. Five populations were analysed inheritance resistance.Reciprocal crosses made between resistant (R) and susceptible (S) Within crosses, dose-responses reciprocal F1 families all except A61 similar to each other, indicating that resistance these is encoded on nuclear genome. The level dominance observed dose-response experiments ranged from partial...