Abstract:

To evaluate the genetic diversity and variation of weed rice and cultivated rice, 50 accessions of weed rice and 18 cultivars of cultivated rice were analyzed by 9 phytological characteristics. The results showed that, Weeds in rice plants high, ear length, the average number of grains per spike, seed setting rate, awn length, awn color, grain color and other botanical features great variation than those of cultivated rice. Nei’s genetic diversity (h) indicated that the genetic diversity of weed rice was obviously higher than that of cultivated rice. The UPGMA cluster analysis revealed that there was a close relationship between weed rice and cultivated rice, but distinct genetic differentiation was detected between them, supporting the point of view that they are two independent species.