[Objective] The paper was to explore the flowering habits and fertility of Gaozhou common wild rice （Oryza rufipogon Griff.） in Lingshui of Hainan Province. [Method] The flowering habits, pollen fertility and seed setting rate of Gaozhou common wild rice in Lingshui of Hainan Province were studied, and compared with the flowering habits of common wild rice in Hainan Province. [Result] Gaozhou common wild rice was able to flower twice a year. The first flowering stage was from mid-April to mid-June for about 60 d, and the daily peak flowering dates were from May 13 to May 22. The daily flowering time was mainly between 11：20 and 13：00, and the peak flowering was at 11：30. The second flowering stage was from late August to late October for about 45 d, and the peak flowering dates lasted from September 8 to September 18. The daily flowering time was mainly from 11：15 to 12：50, and the daily peak flowering was at 11：30. In both flowering stages, the panicles had the same flowering characteristics. The stigma exsertion reached a high value of 95.37% with single （46.23%） and dual （49.14%） stigmas exsertion respectively. A spikelet remained open for 1.5-2.5 h, the angle of spikelet opening varied from 29.9° to 32.4°. At the two flowering stage the average pollen fertility rates were 89.67% and 85.62%, the average seed setting rates were 58.81% and 55.79%, respectively. Hainan population flowered only once （from mid-October to mid-December）, this had significant difference with the performance of Gaozhou common wild rice which flowered twice a year. [Conclusion] The results provided basis for the research on gene flow frequency from transgenic rice to wild rice and its relationship with flowering habits of common wild rice.
[ Objective ] The paper was to isolate actinomycete strains with antagonistic activity against yam anthracnose from the rhizosphere soil of medicinal plants in Hainan Province, and identify its taxonomic status. [ Method ] Using HV medium, actinomycete strains were isolated from the rhizesphere soil of frangipani （Plumeria rubra L. ）. The active antagonistic actinomycetes were selected by using confrontation culture method and antifimgal test of fermentation products. Ac- cording to morphology, combined with 16S rRNA gene analysis, the taxonomic status of active actinomycetes was identified. [ Result] Twelve strains of actinomyce- tes were isolated from the rhizosphere soil of medicinal plant frangipani. Strain 51173 showed significant antifungal activity against Colletotrichum gloeosporioides, which was identified to be a member of Streptomyces violaceusniger 16S rRNA gene clade. [ Conclusion] Strain 51173 showed a good application potential for bio- logical control against yam anthracnose.
