Intra-population genetic structure of Oryza rufipogon Griff. in Yunnan, China

In order to reveal the genetic subdivision within population of common wild rice Oryza rufipogon Griff., allozyme analysis was conducted using 22 loci on a typical population from Yunnan Province, China. Non-random distributi on of genotypes and/or genetic variability was found among three subpopulat ions, and the result was further demonstrated by considerable genetic diffe rentiation observed (F-ST=0.206) within the population. Microhabitat select ion may not be an important factor in shaping intra-population genetic stru cture, and restricted gene flow (N-m=0.964 <1) and genetic drift act togeth er towards a genetic subdivision within the population. This genetic subdiv ision may enhance inbreeding and will ultimately lead to genetic depletion within the predominantly outcrossing (t=0.830) perennial population, and th erefore, more attention should be paid to the conservation and genetic mana gement of the population.