摘要 : The study of gene flow between cultivated rice species and its weedy and wild relatives is important to control the creation of super weeds / evolution of aggressive weeds. In Chhattisgarh State, rice is grown in about four millio... 展开 The study of gene flow between cultivated rice species and its weedy and wild relatives is important to control the creation of super weeds / evolution of aggressive weeds. In Chhattisgarh State, rice is grown in about four million hectares; environmental factors strongly influence the cultivated crops. The cultivated rice O. sativa and its wild relatives O. nivara and O. spontanea represent a suitable model to study the transfer of genetic material. Three inter-crossable species of rice, common cultivated rice (Oryza, sativa L.), natural hybrid/weedy rice (O. spontanea), wild rice (O. nivara) and F₂ segregating population from crosses of (i) O. nivara x O. sativa, (ii) O. sativa x O. nivara and (iii) O. sativa x O. spontanea were used for the study of gene flow under natural field conditions. Morphological and molecular markers were used for accurate assessment of the gene flow from cultivated rice varieties to weedy and wild relatives and vice-versa. The study showed that the gene flow does occur between O. sativa, O. nivara and O. spontanea under natural environmental conditions, in all possible directions even up to the maximum isolation distance of 3.75 m. 收起