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Kern AJ, Myers TM, Jasieniuk M, Murray BG, Maxwell BD, Dyer WE: Two recessive gene inheritance for triallate resistance in Avena fatua L. J Hered. 2002 Jan-Feb;93(1):48-50.
Extensive use of the preemergence herbicide triallate over the last three decades has selected for resistant (R) Avena fatua L. populations in several areas of the United States and Canada. R plants are also cross-resistant to the unrelated pyrazolium herbicide difenzoquat. We made reciprocal crosses between inbred R and susceptible (S) lines to determine the genetic basis of triallate resistance. Seeds from parental lines and F (2) populations were treated with soil applications of 0.275, 0.55, or 1.1 kg/ha triallate in the greenhouse and plant heights recorded after 37 days. Surviving F (2) plants were selfed and the resulting F (3) families were screened with 1.1 kg/ha triallate. In the F (2) populations, assortment of S and R phenotypes fit a 15:1 segregation ratio, suggesting that resistance was controlled by the two independently segregating recessive genes TRR1 and TRR2. None of the 912 F (3) progeny from 51 R F (2) individuals was susceptible to triallate treatment, further supporting a two-gene mode of inheritance. There was a possible maternal effect on susceptibility at the highest triallate rate tested. |
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