Effects of Streptomyces sp. MG 121 on Growth of Pepper Plants and Antifungal Activity

The microorganisms with the antifungal activity against Phytophthora capsici and Colletotrichum acutatum and the plant growth promotion activity were screened from forest soils of Moon-gyeong (Juheul Mountain), Gyeongsangbuk-do. One of the isolates, strain MG 121 showed antifungal activity against P. capsici and C. acutatum and possessed phosphate solubilization activity was selected to development biocontrol agent. The strain MG 121 was identified as Streptomyces sp. by analysis of 16S rDNA. On the test with pepper fruits, the strain inhibited disease incidences of late blight and anthracnose over 80%. In greenhouse test, plant height, the number of leaf, fresh weight and roots length of pepper plants upon treatment of culture suspension of Streptomyces sp. MG 121 were significantly higher than those without the bacterial cells. In addition, strain MG 121 was capable to solublize rock-phosphate after incubation for 144 hours in potato dextrose broth. The concentration of soluble phosphate in PDB amended with 0.5% rock-phosphate was increased up to .

从庆尚北道文庆（周鹤山）的森林土壤中筛选出对辣椒疫霉和尖孢炭疽菌具有抗真菌活性以及具有促进植物生长活性的微生物。其中一株分离株MG121对辣椒疫霉和尖孢炭疽菌显示出抗真菌活性，并具有溶解磷酸盐的活性，被选用于开发生物防治剂。通过对16S rDNA的分析，菌株MG121被鉴定为链霉菌属。在辣椒果实试验中，该菌株对晚疫病和炭疽病的发病率抑制率超过80%。在温室试验中，用链霉菌MG121的培养悬浮液处理后，辣椒植株的株高、叶片数量、鲜重和根长都显著高于未用该细菌细胞处理的植株。此外，菌株MG121在马铃薯葡萄糖肉汤中培养144小时后能够溶解磷矿石。在添加0.5%磷矿石的马铃薯葡萄糖肉汤中，可溶性磷酸盐的浓度增加至……（原文此处似乎不完整）