Plant Source Of Antibacterial Substances From A Preliminary Study

It is a important way to search new fungicides from plants. There are abundant resources from plants in the northwest of china which is a good aera. The reaserch based on screening plants from the area and utilized 27 plants of 6 families to bioassay. These fungi are Botrytis cirerea Fusarium graminearum Phytophthora capsicL Glomerella cingulata Exserohilum turcicum and Blumeria graminis We studyed specialy Cwninwn.cyminum and Ginkgo biloba L.which corned from Taixing of Jiangsu Province. The results as the following:Firstly, The extracts from Cuminum cyminum, Angelica dahurica, Heracleam moellendorffii, Heracleum millefolium, Lorucera tragophylla, Rodgersia aesculifolia, Abies fargesii and Jasminum giraldii have inhibition to hypha. Their inhibition ratio are strong more than 80% separately. The extracts' inhibition ratio from Cuminum cyminum, Angelica dahurica, Heracleam moellendorffii, Heracleum millefolium, Abies fargesii, Rodgersia aesculifolia, Sedum aizoom, Rhodiola kirilowii and Daucus carat are powerful more than 80% relatively.Secondly, The extracts from Cuminum cyminum and Heracleam moellendorffii are obvious result, which rates are more than 70%. Extracts of plants that were strong inhibition in vitro are tested against to tomato gray mould and apple anthracnose in vivo on fruit. The result of experiment shows that the protective efficacy of Rodgersia aesculifolia and Abies fargesii are 55.56% and 55.83% to tomato gray mould.Thirdly, The root of Heracleam moellendorffii and leaf Abies fargesii are strong inhibition parts to hypha of 5 fungi. The extracts of acetidi aether and methanol from Heracleam moellendorffii, petroleu and acetm from Abies fargesii , athenol and methanol from Rodgersia aesculifolia are gather to restain mycelum of 5 fungi.Fouthly, The extracts of acetidin from Cuminum cyminum ore strong inhibition to hypha of 5 fungi. Cumin oil have inhibition to wheat powdery mildew. In the studying SFE-CO2 extraction of Cumin oil, when sample amount is 4g, the fittest conditions for extraction is material 30 order, 5000Psi, 55,static extracting 5min and 60ml CO2.Finally, The episperm from Ginkgo biloba was carried out. The fungistasis of hydroginkgoic acid and ginkgoic acid are high inhibition to hypha of 5 fungi. Ginkgol have strong inhibition to wheat powdery mildew.