TY - JOUR
T1 - Inheritance of evolved clethodim resistance in Lolium rigidum populations from Australia
AU - Saini, Rupinder Kaur
AU - Malone, Jenna
AU - Gill, Gurjeet
AU - Preston, Christopher
N1 - Funding Information:
We gratefully acknowledge ACIAR (Australian Centre for International Agricultural Research) and the Grains Research and Development Corporation for funding this research. We wish to thank Dr Peter Boutsalis for providing L. rigidum seeds and Lovreet Shergill, Geetha Velappan, Ruwan Lenorage, Tom Drapaniotis, Duc The Ngo and Hue Thi Dang for their technical support.
Publisher Copyright:
© 2016 Society of Chemical Industry
PY - 2017/8
Y1 - 2017/8
N2 - BACKGROUND: In Australia, the extensive use of clethodim for the control of Lolium rigidum has resulted in the evolution of many clethodim-resistant L. rigidum populations. Five clethodim-resistant populations of L. rigidum were analysed for the inheritance of clethodim resistance. RESULTS: Reciprocal crosses were made between resistant (R) and susceptible (S) populations. Within crosses, dose–responses of reciprocal F1 families of all populations except A61 were similar to each other, indicating that clethodim resistance in these populations is encoded on the nuclear genome. The level of dominance observed in the dose–response experiments ranged from partial to complete within the herbicide rate used. In the A61 population, within each cross, the response of F1 from the maternal and paternal parent was different, indicating that resistance is inherited through the female parent. All backcross populations segregated in a different manner. Only one population, FP, fitted a single-gene model (1:1). Two populations fitted two-gene models: a 3:1 inheritance model for F4 and a 1:3 inheritance model for A91. For population E2, no clear pattern of inheritance was determined, suggesting more complex inheritance. CONCLUSION: The results of this study indicate that different patterns of clethodim resistance in L. rigidum exist.
AB - BACKGROUND: In Australia, the extensive use of clethodim for the control of Lolium rigidum has resulted in the evolution of many clethodim-resistant L. rigidum populations. Five clethodim-resistant populations of L. rigidum were analysed for the inheritance of clethodim resistance. RESULTS: Reciprocal crosses were made between resistant (R) and susceptible (S) populations. Within crosses, dose–responses of reciprocal F1 families of all populations except A61 were similar to each other, indicating that clethodim resistance in these populations is encoded on the nuclear genome. The level of dominance observed in the dose–response experiments ranged from partial to complete within the herbicide rate used. In the A61 population, within each cross, the response of F1 from the maternal and paternal parent was different, indicating that resistance is inherited through the female parent. All backcross populations segregated in a different manner. Only one population, FP, fitted a single-gene model (1:1). Two populations fitted two-gene models: a 3:1 inheritance model for F4 and a 1:3 inheritance model for A91. For population E2, no clear pattern of inheritance was determined, suggesting more complex inheritance. CONCLUSION: The results of this study indicate that different patterns of clethodim resistance in L. rigidum exist.
KW - clethodim resistance
KW - inheritance
UR - http://www.scopus.com/inward/record.url?scp=85007553995&partnerID=8YFLogxK
U2 - 10.1002/ps.4493
DO - 10.1002/ps.4493
M3 - Article
C2 - 27933726
AN - SCOPUS:85007553995
VL - 73
SP - 1604
EP - 1610
JO - Pest Management Science
JF - Pest Management Science
SN - 1526-498X
IS - 8
ER -