Inheritance of Dicamba Resistance in Wild Mustard (Brassica kaber)

Abstract

The inheritance of resistance to dicamba in wild mustard was determined by making reciprocal crosses between a resistant (R) population derived from a field treated repeatedly with auxin-type herbicides, and a known susceptible (S) population. The resulting F1 hybrids were selfed to produce F2 populations and backcrossed to the S parent. At the three- to four-leaf stage, parental, F1, F2, and backcross populations were screened for resistance to dicamba at three dosages (50, 200, and 400 g ai ha−1). F1 progeny survived all dosages and exhibited levels of injury similar to the R parental population. F2 populations segregated in a 3:1 ratio of R to S phenotypes. Progeny of backcrosses segregated in a 1:1 (R:S) ratio. Responses of the F1, F2, and backcross populations to treatment with dicamba indicate that resistance is determined by a single, completely dominant nuclear allele.

Occurrence, genetic control and evolution of non-target-site based resistance to herbicides inhibiting acetolactate synthase (ALS) in the dicot weed Papaver rhoeas

“…Observed NTSR segregation in three of the F1 progenies could not be explained by Mendelian segregation of a single dominant or recessive NTSR locus (Table 3). This is in contrast to the two previous NTSR inheritance studies conducted on dicot weeds that proposed a dominant or partially dominant monogenic control for NTSR to glyphosate in C. canadensis [24] or for NTSR to auxin analogues in S. arvensis [26]. However, the herbicides used in these studies were not ALS inhibitors.…”

“…They identified monogenic or polygenic NTSR and provided insight into NTSR evolution [10,20,22,23]. NTSR inheritance studies also addressed two dicot weeds: Conyza canadensis (NTSR to the 5-enolpyruvylshikimate-3-phosphate synthase inhibitor glyphosate [24,25]) and S. arvensis (probable NTSR to auxin analogues [26,27]). To the best of our knowledge, no such study had been conducted to date that addressed occurrence and inheritance of NTSR to ALS inhibitors in a dicot species.…”

Transfer of auxinic herbicide resistance from Brassica kaber to Brassica juncea and Brassica rapa through embryo rescue

“…The remaining four plants initially showed minor dicamba injury but recovered from the symptoms. Chi-square tests were performed to determine the goodness of fit to a 1:1 ( R / S ) segregation because resistance to dicamba is determined by a single dominant gene in B. kaber (Jasieniuk et al 1995; Jugulam et al 2005). The progeny from BC 2 F 1 showed 4:6 ( R / S ) segregation with a χ 2 value of 0.4 (which is less than the table value of “3.841” at 0.05 probability for 1 df).…”

“…Classical genetic studies demonstrated that B. kaber auxinic herbicide resistance is determined by a single dominant gene (Jasieniuk et al 1995; Jugulam et al 2005). The single gene inheritance facilitates the transfer of genes among related species.…”

Ground Ivy (Glechoma hederacea) Populations Respond Differently to 2,4-D or Triclopyr

“…L.C. Wheeler] (Jasieniuk et al 1995), and scentless mayweed [Tripleurospermum inodorum (L.) Schultz Bip.] (Ellis and Kay 1975) vary in their response to auxinic herbicides.…”