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ARS Home » Plains Area » Fargo, North Dakota » Edward T. Schafer Agricultural Research Center » Sunflower and Plant Biology Research » Research » Publications at this Location » Publication #159983
Title: GENE FLOW FROM IMIDAZOLINONE-RESISTANT DOMESTICATED SUNFLOWER TO WILD RELATIVES

Author
item MASSINGA, RAFAEL - KANSAS STATE UNIV.
item AL-KHATIB, KASSIM - KANSAS STATE UNIV.
item ST. AMAND, PAUL - KANSAS STATE UNIV.
item Miller, Jerry

Submitted to: Weed Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 5/28/2003
Publication Date: 11/1/2003
Citation: MASSINGA, R.A., AL-KHATIB, K., ST. AMAND, P., MILLER, J.F. GENE FLOW FROM IMIDAZOLINONE-RESISTANT DOMESTICATED SUNFLOWER TO WILD RELATIVES. WEED SCIENCE. 2003. V. 51. P. 854-862.

Interpretive Summary: Gene flow from imidazolinone (IMI)-resistant sunflower to IMI-susceptible common sunflower and prairie sunflower was studied. Both greenhouse and field studies were utilized. Greenhouse crosses made by hand between the resistant and susceptible sunflower showed that 94% of common sunflower and 79% of prairie sunflower were resistant or moderately resistant when treated with the herbicide at a rate of 40 g ai/ha. In the field, gene flow was detected up to 30 m from the pollen source for both species, and it decreased as distance from the pollen source increased. In studies conducted in 2000, 11 to 22% of the progeny were resistant at 2.5 m from the pollen source and 0.3 to 5% were resistant at 30 m from the pollen source. In studies conducted in 2001, the number of resistant progeny did not exceed 7 and 2% at 2.5 and 30 m from the pollen source, respectively. The results of this study showed that IMI-resistant domesticated sunflower outcrosses with common and prairie sunflower over distances typically encountered near production fields. Also, backcrosses of resistant hybrids with wild parents were successful, further increasing the potential for the spread of IMI-resistant feral sunflower.

Technical Abstract: Gene flow from imidazolinone (IMI)-resistant sunflower to IMI-susceptible common sunflower (Helianthus annuus L.) and prairie sunflower was studied. Both greenhouse and field studies were utilized. Greenhouse crosses made by hand between the resistant and susceptible sunflower showed that 94% of common sunflower and 79% of prairie sunflower were resistant or moderately resistant when treated with the herbicide at a rate of 40 g ai/ha. In the field, gene flow was detected up to 30 m from the pollen source for both species, and it decreased as distance from the pollen source increased. In studies conducted in 2000, 11 to 22% of the progeny were resistant at 2.5 m from the pollen source and 0.3 to 5% were resistant at 30 m from the pollen source. In studies conducted in 2001, the number of resistant progeny did not exceed 7 and 2% at 2.5 and 30 m from the pollen source, respectively. The results of this study showed that IMI-resistant domesticated sunflower outcrosses with common and prairie sunflower over distances typically encountered near production fields. Also, backcrosses of resistant hybrids with wild parents were successful, further increasing the potential for the spread of IMI-resistant feral sunflower.