Submitted to: Arkansas Agricultural Experiment Station Research Series
Publication Type: Experiment Station
Publication Acceptance Date: 2/17/2004
Publication Date: 8/10/2004
Citation: Estorninos, L.E., Gealy, D.R., TeBeest, D., Burgos, N. 2003. Reciprocal outcrossing rates between non-herbicide-resistant rice and red rice. Arkansas Agricultural Experiment Station Research Series 504. pp. 41-46. Interpretive Summary: Interpretive summary not required.
Technical Abstract: Outcrossing between rice and red rice has been a concern because of their morphological similarities and oftentimes synchronous flowering. In 2000, pairs of rice and red rice with near synchronous flowering were planted in isolated field plots. In 2002, at least 2300 seeds produced from two of the pairs were planted in a greenhouse, and DNA was extracted from leaves of the 14-day-old seedlings. Outcrossing between Kaybonnet rice and AR1994-8 black-hulled red rice was estimated at 0.10% with AR1994-8 as the pollen donor, but was not detectable with Kaybonnet as the pollen donor. Outcrossing between Starbonnet rice and AR1994-11D red rice was estimated at 0.23% with AR1994-11D as the pollen donor and 0.14% with Starbonnet as the pollen donor. Although preliminary, these results suggest that gene flow from red rice to rice may be higher than from rice to red rice, and that greater panicle height differences between rice and red rice may reduce outcrossing.