To isolate the causal organism of soft rot of vegetables, diseased samples of potato, tomato, carrot, chilies, and bell pepper, were analyzed in the lab, using nutrient agar (NA) and/or the enrichment host (Bell peppe...To isolate the causal organism of soft rot of vegetables, diseased samples of potato, tomato, carrot, chilies, and bell pepper, were analyzed in the lab, using nutrient agar (NA) and/or the enrichment host (Bell pepper) technique. Successful isolations were purified by sub-culturing, identified as Erwinia carotovora subsp. carotovora through biochemical tests and their pathogenicity was confirmed through inoculation on green tomato fruits. The isolates were tested for their aggressiveness to find out the most aggressive one in term of producing maximum soft rot on tomatoes. CRD (completely randomized design), with four replication was used and data were analyzed using LSD (least significant test) test. Among the five isolates evaluated for aggressiveness on tomato fruits, chili isolate was found to be the most aggressive followed by tomato and potato isolates producing 22.3 mm, 7.9 mm, and 7.8 mm diameter soft rot lesions, respectively.展开更多
Ten isolates of Erwinia carotovora ssp. carotovora (Ecc) were isolated from infected potato tubers of Picasso, Sante, and Nevskiy varieties collected from different regions in Kyrgyzstan. Isolates were identified as E...Ten isolates of Erwinia carotovora ssp. carotovora (Ecc) were isolated from infected potato tubers of Picasso, Sante, and Nevskiy varieties collected from different regions in Kyrgyzstan. Isolates were identified as Erwinia carotovora ssp. carotovora (Ecc) by standard bacteriological techniques and pathogenicity tests on tubers and also by PCR analyses. Tests on the pathogenicity of E. carotovora ssp. carotovora (Ecc) strains to host plants by artificial inoculation have shown a high sensibility of the Picasso variety. As a result, five isolates were chosen, three isolates (EcPo1, EcPo2, and Eco3) were highly pathogenic, while two isolates (Eco4 and Eco5) were weakly pathogenic. The antagonistic bacteria, Streptomyces diastatochromogenes strain sk-6, and Streptomyces graminearuss strain sk-2, have a highly significant effect on soft rot bacteria isolates (Ecc), more than the other tested antagonistic organisms in vitro screening biotests. The Streptomyces diastatochromogenes sk-6 was selected for the control assay of storage potatoes against the most common soft rot bacterial strain in Kyrgyzstan, Erwinia carotovora sp. carotovora EcPo2. The pretreatment of potato tubers with antagonistic bacteria successfully prevented the initial infection multiplication of soft rot bacteria and reduced soft rot disease of potatoes in storage. These results justify selection of the dose 10<sup>6</sup> cells/ml of bacteria Streptomyces diastatochromogenes sk-6 for use in powdering the infected or non-infected potato tubers to suppress the development soft rot during storage. Streptomyces diastatochromogenes sk-6 as a biological disinfectant could destroy surface and internal infections, protect the tubers from the growth of phytopathogenic bacteria in the early period of their reproduction, and improve the overwintering of winter crops.展开更多
Effect of different Zinc doses was investigated against Erwinia carotovora ssp. atroseptica, the potato blackleg/soft rot causing organism, during 2009 and 2010 in Department of Plant Pathology and Institute of Biotec...Effect of different Zinc doses was investigated against Erwinia carotovora ssp. atroseptica, the potato blackleg/soft rot causing organism, during 2009 and 2010 in Department of Plant Pathology and Institute of Biotechnology and Genetic Engineering, The University of Agriculture, Peshawar-Pakistan. Out of 200 tested samples, 21 of them were proved to be Eca. However, these tentative Eca isolates showed some characteristics which were unexpected for Eca. We, therefore, decided to perform Polymerase Chain Reaction using Eca-specific primers, Eca1F and Eca2R for confirm identification. For disease management, at the time of sowing, pots containing 5 kg sterilized soil were applied with Zinc in four different treatments i.e. 8 mg, 10 mg, 12 mg and 14 mg along with one control. Results indicated that 12 mg (4.8 kg Zn ha-1) were better doses in controlling the disease up to 73% and increasing the yield up to 117% as compared to control plants.展开更多
为了明确引起云南香蕉细菌性软腐病的病原菌,为该病害防控提供基础,在植蕉区采集香蕉细菌性软腐病病害标样,对病原菌进行分离、致病性测定、寄主范围测定、形态学观察、生理生化反应及16S r DNA序列分析。结果表明:分离获得的菌株均有...为了明确引起云南香蕉细菌性软腐病的病原菌,为该病害防控提供基础,在植蕉区采集香蕉细菌性软腐病病害标样,对病原菌进行分离、致病性测定、寄主范围测定、形态学观察、生理生化反应及16S r DNA序列分析。结果表明:分离获得的菌株均有致病性,病原菌形态特征、寄主范围、生理生化测定结果与Erwinia chrysanthemi相符。16S r DNA序列分析表明:代表性菌株的测序结果与E.chrysanthemi(序列登录号:GU811708)的同源性达到99%以上,系统发育树分析结果与之一致,表明引起云南香蕉细菌性软腐病的病原菌为菊欧氏杆菌(E.chrysanthemi),该病害是近年来发生在云南植蕉区的一种新病害。展开更多
文摘To isolate the causal organism of soft rot of vegetables, diseased samples of potato, tomato, carrot, chilies, and bell pepper, were analyzed in the lab, using nutrient agar (NA) and/or the enrichment host (Bell pepper) technique. Successful isolations were purified by sub-culturing, identified as Erwinia carotovora subsp. carotovora through biochemical tests and their pathogenicity was confirmed through inoculation on green tomato fruits. The isolates were tested for their aggressiveness to find out the most aggressive one in term of producing maximum soft rot on tomatoes. CRD (completely randomized design), with four replication was used and data were analyzed using LSD (least significant test) test. Among the five isolates evaluated for aggressiveness on tomato fruits, chili isolate was found to be the most aggressive followed by tomato and potato isolates producing 22.3 mm, 7.9 mm, and 7.8 mm diameter soft rot lesions, respectively.
文摘Ten isolates of Erwinia carotovora ssp. carotovora (Ecc) were isolated from infected potato tubers of Picasso, Sante, and Nevskiy varieties collected from different regions in Kyrgyzstan. Isolates were identified as Erwinia carotovora ssp. carotovora (Ecc) by standard bacteriological techniques and pathogenicity tests on tubers and also by PCR analyses. Tests on the pathogenicity of E. carotovora ssp. carotovora (Ecc) strains to host plants by artificial inoculation have shown a high sensibility of the Picasso variety. As a result, five isolates were chosen, three isolates (EcPo1, EcPo2, and Eco3) were highly pathogenic, while two isolates (Eco4 and Eco5) were weakly pathogenic. The antagonistic bacteria, Streptomyces diastatochromogenes strain sk-6, and Streptomyces graminearuss strain sk-2, have a highly significant effect on soft rot bacteria isolates (Ecc), more than the other tested antagonistic organisms in vitro screening biotests. The Streptomyces diastatochromogenes sk-6 was selected for the control assay of storage potatoes against the most common soft rot bacterial strain in Kyrgyzstan, Erwinia carotovora sp. carotovora EcPo2. The pretreatment of potato tubers with antagonistic bacteria successfully prevented the initial infection multiplication of soft rot bacteria and reduced soft rot disease of potatoes in storage. These results justify selection of the dose 10<sup>6</sup> cells/ml of bacteria Streptomyces diastatochromogenes sk-6 for use in powdering the infected or non-infected potato tubers to suppress the development soft rot during storage. Streptomyces diastatochromogenes sk-6 as a biological disinfectant could destroy surface and internal infections, protect the tubers from the growth of phytopathogenic bacteria in the early period of their reproduction, and improve the overwintering of winter crops.
文摘Effect of different Zinc doses was investigated against Erwinia carotovora ssp. atroseptica, the potato blackleg/soft rot causing organism, during 2009 and 2010 in Department of Plant Pathology and Institute of Biotechnology and Genetic Engineering, The University of Agriculture, Peshawar-Pakistan. Out of 200 tested samples, 21 of them were proved to be Eca. However, these tentative Eca isolates showed some characteristics which were unexpected for Eca. We, therefore, decided to perform Polymerase Chain Reaction using Eca-specific primers, Eca1F and Eca2R for confirm identification. For disease management, at the time of sowing, pots containing 5 kg sterilized soil were applied with Zinc in four different treatments i.e. 8 mg, 10 mg, 12 mg and 14 mg along with one control. Results indicated that 12 mg (4.8 kg Zn ha-1) were better doses in controlling the disease up to 73% and increasing the yield up to 117% as compared to control plants.
文摘为了明确引起云南香蕉细菌性软腐病的病原菌,为该病害防控提供基础,在植蕉区采集香蕉细菌性软腐病病害标样,对病原菌进行分离、致病性测定、寄主范围测定、形态学观察、生理生化反应及16S r DNA序列分析。结果表明:分离获得的菌株均有致病性,病原菌形态特征、寄主范围、生理生化测定结果与Erwinia chrysanthemi相符。16S r DNA序列分析表明:代表性菌株的测序结果与E.chrysanthemi(序列登录号:GU811708)的同源性达到99%以上,系统发育树分析结果与之一致,表明引起云南香蕉细菌性软腐病的病原菌为菊欧氏杆菌(E.chrysanthemi),该病害是近年来发生在云南植蕉区的一种新病害。
