Higher Degree by Research Candidate
School of Agriculture, Food and Wine
Faculty of Sciences
Herbicide Resistance in Winter Grass (Poa annua) and its Management
Supervisors: Prof Christopher Preston, A/Prof Gurjeet Gill and Dr. Peter Boutsalis
Poa annua, also commonly known as annual meadow grass, winter grass or bluegrass, belongs to the family Poaceae and is a common weed wherever cool-season turf-grasses are grown. It is a problematic weed of turf worldwide due to its unsightly appearance, competition with desirable species, and its upright growth habit producing an uneven surface that affects ball roll in golf and other sports. It is also present as a weed in 38 crops such as vegetables, cereals, sugar beet, potatoes, and orchards in 80 countries. This species is usually controlled by herbicides in turf. However, in the recent years, herbicide resistance has been identified in P. annua. In Australia, resistance to 5 herbicide modes of action has been identified in populations of P. annua collected from golf courses including: ALS inhibitors, Photosystem II inhibitors, tubulin biosynthesis inhibitors, glyphosate and endothall. Although there are several previous studies on herbicide resistance in P. annua, there is limited information available on the mechanisms of resistance to herbicides in this species. The aim of this study is to identify the extent of resistance and the mechanisms of resistance associated with herbicide resistance in P. annua and also develop alternate management strategy.
The main objectives of this project are to:
* Screen P. annua populations for resistance to different herbicide groups
* Undertake detailed dose-response experiments to assess the level of resistance (LD50 and GR50) in different P. annua populations
* Explore the herbicide resistance mechanism including the mutations that confer resistance by sequencing target enzymes as well as non-target site mechanisms where needed
* Identify the mode of inheritance of herbicide resistance of different herbicide groups by segregation of crosses
* Determine the fitness penalty for resistance to different herbicide groups in F2 populations developed from crosses between R and S populations
* Identify alternate herbicides to control the resistant P. annua populations
This project will provide comprehensive information on the nature of resistance to the different herbicides in P. annua and the extent of resistance in turf across Australia. This will help determine management options by suggesting possible approaches to management, including non-chemical approaches where appropriate. Resistance is now suspected in P. annua to propyzamide, which has become an extremely important herbicide for the control of multiple herbicide resistant Loilum rigidum populations. Lessons learned from research on propyzamide resistant P. annua could be highly useful for the management of herbicide resistant L. rigidum in the future.
Date Position Institution name 2009 Scientific Officer Bangladesh Rice Research Institute
Awards and Achievements
Date Type Title Institution Name Country Amount 2019 Award APWSS Travel Grants Asian Pacific Weed Science Society Malaysia 400 USD
Language Competency English Can read, write, speak, understand spoken and peer review
Date Institution name Country Title 2018 - 2021 University of Adelaide Australia PhD 2008 - 2010 Bangladesh Agricultural University Bangladesh MS in Agronomy
Year Citation 2020 Barua, R., Preston, C., Malone, J., Gill, G., & Boutsalis, P. (2020). Incidence of multiple herbicide resistance in annual bluegrass (Poa annua) across southeastern Australia. Weed Science, 68(4), 340-347.
2017 Barua, R. (2017). Performance of Some Tidal Submergence Tolerant Rice Genotypes in Southern Coastal Regions of Bangladesh. Scientia Agriculturae.
2016 Mondal, S., Ghosal, S., & Barua, R. (2016). Impact of elevated soil and air temperature on plants growth, yield and physiological interaction: a critical review. Scientia Agriculturae, 14(3).
2015 Mamin, M., Biswash, M., Barua, R., Zahan, A., Naher, S., Mukul, M., . . . Islam, M. (2015). Performance of Some Zinc Enriched Rice Genotypes in Different Agro-Ecological Conditions of Bangladesh. Scientia Agriculturae, 11(1).
2015 Karmakar, B., Islam, M., Islam, M., Mukul, M., Biswash, M., Barua, R., . . . Mamin, M. (2015). On-farm Evaluation of Rice Genotypes under Drought Prone Rainfed Environments. Scientia Agriculturae, 12(2), 72-77.
2015 Biswash, M., Islam, M., Islam, M., Karmakar, B., Barua, R., & Mamin, M. (2015). Performence of Some Rainfed Low Land Rice Genotypes in Different Agro-Ecological Conditions of Bangladesh. Applied Science Reports, 9(3).
2015 Barua, R., De Ocampo, M., Egdane, J., Ismail, A., & Mondal, S. (2015). Phenotyping rice (Oryza sativa L.) genotypes for physiological traits associated with tolerance of salinity at seedling stage. Scientia Agriculturae, 12(3).
2015 Barua, R., Biswash, M., Islam, M., Islam, M., Karmakar, B., Mukul, M., . . . Mamin, M. (2015). Performance of Some Salt Tolerant Rice Genotypes in Coastal Regions of Bangladesh under Irrigated Dry Season. Applied Science Reports, 11(2), 712-75.
2014 Barua, R. (2014). Effect of potassium and vermicompost on the growth, yield and nutrient contents of mungbean (BARI Mung 5). Open Science Journal of Bioscience and Bioengineering. 2014 Barua, R. (2014). CONTEMPORARY YIELDING KNOWLEDGE OF RICE CULTIVATION AT GRASSROOTS Level- A Study. Eco-friendly Agril. J.. 2014 Barua, R. (2014). EFFECTS OF SPACING AND NUMBER OF SEEDLINGS HILL-1 ON THE YIELD AND YIELD COMPONENTS OF BRRI dhan47. Eco-friendly Agril. J.. 2011 Barua, R. (2011). Effect of Mimosa (Mimosa invisa) compost and phosphorus on the yield and yield components of lentil (Lens culinaris L.). The Agriculturists.
Year Citation 2019 Barua, R. (2019). INCIDENCE OF MULTIPLE HERBICIDE RESISTANCE IN WINTER GRASS (Poa annua) ACROSS SOUTH-EASTERN AUSTRALIA. In WEED SCIENCE FOR SUSTAINABLE AGRICULTURE AND ENVIRONMENT. Sarawak, Malaysia.
Adelaide Scholarship International (ASI)
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