Progress 10/01/19 to 09/30/20
Outputs
Target Audience:Farmers, farm advisors, pest control agents (PCAs), CE specialists, herbicide company personnel, weed scientists Changes/Problems:We were not able to obtain 14C-glufosinate from the herbicide company, as originally promised, thus must take a different approach to accomplish the research for Objective 2. We are currently exploring different options with researchers at Oregon State University and Colorado State University. What opportunities for training and professional development has the project provided?Three postdoctoral fellows and two undergraduate students worked on various aspects of the research for this Objective. Two of the postdocs have moved on to permanent positions focused on pest management in crops and one postdoc took on a position as Project Manager of the International Weed Genomics Consortium. Both undergraduates have gone on to graduate school. How have the results been disseminated to communities of interest?We posted one blog on July 13, 2020 on the UC Weed Science blog (https://ucanr.edu/blogs/UCDWeedScience/) and published one paper in the journal Agronomy (Agronomy 2020, 10,1288:doi:10.3390/agronomy10091288). What do you plan to do during the next reporting period to accomplish the goals?To complete the research for Objective 3 and to disseminate the results from the project more broadly. We are also collaborating with researchers at Oregon State University and Colorado State University to elucidate the underlying mechanisms underlying weed response to glufosinate.
Impacts
What was accomplished under these goals?
The focus of this year's research has been completion of the research, data analyses, publication, and outreach for Objectives 4a and 4b. To date, we published one paper in the journal Agronomy (Agronomy 2020, 10, 1288:doi:10.3390/agronomy10091288) and posted one weed blog dated 7/13/2020 on the research. Results of this research is impactful because the herbicide glufosinate is commonly used to control glyphosate-resistant weeds and resistance to glufosinate has very rarely been observed globally. However, our studies showed that reduced susceptibility to glufosinate can evolve over a short period of time (3 generations in our study) of repeated glufosinate application in Italian ryegrass, and points to the importance of growers incorpating a diversity of approaches, both chemical and non-chemical, in the management of Italian ryegrass in annual and perennial cropping systems of California.
Publications
- Type:
Journal Articles
Status:
Published
Year Published:
2020
Citation:
Matzrafi M., S. Morran, and M. Jasieniuk. 2020. Recurrent selection with glufosinate at low rates selection reduces the susceptibility of a Lolium perenne ssp. multiflorum population to glufosinate. Agronomy 10, 1288: doi:10.3390/agronomy10091288
- Type:
Book Chapters
Status:
Under Review
Year Published:
2021
Citation:
Beckie, H. and M. Jasieniuk. 2021. Lolium rigidum Gaudin and Lolium multiflorum Lam. in Biology and Management of Problematic Weed Species, B. Chauhan (ed.), Elsevier Inc.
- Type:
Journal Articles
Status:
Other
Year Published:
2021
Citation:
Jhala, A., H. Beckie, R. Busi, M. Jasieniuk, C. Mallory-Smith, and J. Norsworthy. 2021. Transfer of resistance alleles from herbicide-resistant to susceptible grass weeds via pollen-mediated gene flow. Weed Technology.
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Progress 10/01/18 to 09/30/19
Outputs
Target Audience:Herbicide company personnel, CE specialists, weed scientists Changes/Problems:
Nothing Reported
What opportunities for training and professional development has the project provided?Two postdoctoral fellows were mentored and trained in scientific principles, approaches, and methods used in weed science and weed evolution. How have the results been disseminated to communities of interest?Results of the studies were communicated to herbicide company personnel (BASF and Bayer CropScience AG) who supported the study and to colleagues who are CE specialists/weed scientists, but are still at too early a stage of analysis to report more widely. What do you plan to do during the next reporting period to accomplish the goals?To continue conducting the research proposed in the Project (CA-D-PLS-2235-H) that was initiated 10/1/2018, which includes addressing the following objectives: Objective 2: To elucidate the mechanism of glufosinate resistance in Italian ryegrass of northern California. Objective 3: To evaluate the presence and patterns of multiple herbicide resistance in glufosinate-resistant and susceptible biotypes. Objective 4a: To assess the potential for sublethal doses of glufosinate to select for reduced sensitivity to the herbicide under growth chamber and greenhouse conditions. Objective 4b: To evaluate the selected population for cross-resistance to herbicides with other modes of actions that are commonly used to control Italian ryegrass in California orchards and vineyards.
Impacts
What was accomplished under these goals?
Changes in Knowledge: (1) New knowledge confirming the evolution of resistance to glufosinate in Italian ryegrass populations of northern California. (2) New knowledge on the levels of resistance to glufosinate in Italian ryegrass populations of California. (3) New knowledge on the underlying mechanism of resistance to glufosinate in Italian ryegrass in California.
Publications
- Type:
Journal Articles
Status:
Published
Year Published:
2019
Citation:
Matzrafi M, Brunharo C, Tehranchian P, Hanson BD, and Jasieniuk M. Increased temperatures and elevated CO2 levels reduce the sensitivity of Conyza canadensis and Chenopodium album to glyphosate. Scientific Reports 9:2228
- Type:
Journal Articles
Status:
Published
Year Published:
2019
Citation:
Tehranchian P, Nandula VK, Matzrafi M, and Jasieniuk M (2019) Multiple herbicide resistance in California Italian ryegrass (Lolium perenne ssp. multiflorum): characterization of ALS-inhibiting herbicide resistance. Weed Science 67:273-280.
- Type:
Journal Articles
Status:
Published
Year Published:
2019
Citation:
Rosche C, Hensen I, Schaar A, Zehra U, Jasieniuk M, Callaway RM, Khasa DP, Al-Gharaibeh MM, Lekberg Y, Nagy DU, Pal RW, Okada M, Schrieber K, Turner KG, Lachmuth S, Erst A, Tsunoda T, Sheng M, Schmidt R, Peng Y, Luo W, J�aschke Y, Reshi ZA, Shah MA (2019) Climate outweighs native vs. nonnative range effects for genetics and common garden performance of a cosmopolitan weed. Ecological Monographs 89(4):e01386. 10.1002/ecm.1386.
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