Submitted to: Arkansas Agricultural Experiment Station Research Series
Publication Type: Experiment Station
Publication Acceptance Date: 6/27/2006
Publication Date: 8/8/2006
Citation: Estorninos, L.E., Gealy, D.R., Wilson, C.E. 2006. Genetic analysis and reciprocal outcrossing rates of red rice types in Arkansas. In: Norman, R.J., Meullent, J.-F., Moldenhauer, K.A.K., editors. B.R. Wells Rice Research Studies 2005, Arkansas Agricultural Experiment Station Research Series 540. p.190-199. Available: http://www.uark.edu/depts/agripub/Publications/researchseries. Interpretive Summary:
Technical Abstract: Red rice is a severe weed problem in Arkansas rice fields and can intercross at low rates with rice. Using DNA marker analysis and visual observation, red rice accessions obtained from across Arkansas clearly clustered into major groups of awned and awnless types, which were easily distinguishable from a number of rice-red rice hybrids and commercial rice standards. ‘Red rice-like’ samples from a Mississippi Co. farm were shown to be derived from a cross between rice and awned red rice, while samples from Prairie Co. appeared to be an ordinary red rice biotype. Outcrossing in controlled plots varied by a factor of as much as 25X over a five-year period, and was much greater when (tall) red rice, and not rice, served as the pollen donor. These studies demonstrate how DNA markers can be used in combination with visual observation to identify and potentially mitigate the consequences of outcrossing.