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菌株JK23为本实验室耐辐射微生物资源库保藏的1株耐辐射芽胞杆菌,通过系统的形态学、生理生化实验及分子生物学鉴定,菌株JK23为贝莱斯芽胞杆菌。平板对峙试验表明,菌株JK23对多种植物病原菌都具有明显的抑制作用,抑制率分别为香梨黑斑病菌Alternaria Alternaria 39.68%、西瓜枯萎病菌Fusarium oxysporum SCC-F5 37.5%、水稻恶苗病菌Fusarium moniliforme 50.0%、棉花枯萎病菌Fusarium oxysporum SCC-F11 53.85%、马铃薯早疫病菌Alternaria solani 73.3%、西瓜蔓枯病菌Didymella bryoniae 100%、核桃腐烂病菌Cytcospora sp.100%。显微镜观察发现,菌株JK23能抑制病原真菌菌丝生长,引起菌丝畸形、膨大、固缩。通过基因检测及MALDI-TOF MS（基质辅助激光解吸电离飞行时间质谱）结果分析发现,菌株JK23能产生多种脂肽类抗生素,其产物具有较强的溶血和排油特性。鉴于贝莱斯芽胞杆菌JK23产生的脂肽类活性物质对多种植物病原真菌具有较好的抑制效果,表明其具有较高的开发应用前景。 相似文献
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新疆托木尔峰国家级自然保护区岩面生地衣多样性的研究 总被引：1，自引：0，他引：1
根据实地调查并结合已有的文献资料,对新疆托木尔峰国家级自然保护区岩面生地衣区系进行了研究.结果表明:该地区岩面生地衣共有58种,隶属于6目、18科、35属,其中微孢衣属和平茶渍属种类较多,分别占该地区地衣总数的10.34和15.52％.地衣科目中茶渍目占优势,其科、属、种数分别占该地区地衣总数的72.22,74.28,74.14％.根据地衣对环境的适应特征和选择性,将新疆托木尔峰国家级自然保护区岩面生地衣的地理成分可划分为环北极成分、世界广布成分、中国特有种、欧亚-北美成分、中亚成分、中亚-西亚成分、广泛分布成分等7个分布类型. 相似文献
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根据实地调查资料并结合前人的研究数据,初步鉴定出阿勒泰大青河林场地衣种类52种,隶属于4目、10科、21属.其中茶渍目地衣有6科、16属、42种,分别占该地区地衣科属种总数的60.00％、76.19％、80.77％.优势科主要集中在茶渍目的梅衣科、蜈蚣衣科和石蕊科,占地衣总数的67.31％.根据研究地区的生态环境特征及地衣种类组成,将该地区地衣的地理分布区类型划分为世界广布种、环北极-高山种、北半球大陆广布种、环北方种、环低北极及北方种、东亚种、温带种、两半球广布种、地中海、西亚和中亚种、两极和大西洋种、中国特有种共11种.同时对地衣的生长基物类型进行了统计分析. 相似文献
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采自新疆阿尔金山祁曼塔格山区及新疆塔什库尔干山区的新疆1个新记录科地衣——石鳞衣科(Gypsoplacaceae)单属、单种科,包括石鳞衣属(Gypsoplaca Timdal),单种大叶石鳞衣[Gypsoplaca macrophylla(Zahlbr.)Timdal].该种生长在棕钙土上,与其他土生地衣组成以地衣为主的生物结皮.该科、属在新疆首次发现,为新疆地衣区系及系统分类学研究增加了一个新科.对该科地衣的形态学、解剖学、化学和地理分布等进行了描述和讨论. 相似文献
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新疆额尔齐斯河大峡谷地衣区系特征的初步研究 总被引：1，自引：0，他引：1
根据实地调查并结合已有的文献资料,对新疆额尔齐斯河大峡谷地衣区系进行了初步研究.结果表明:该地区地衣共有72种、1个变种,隶属于6目、16科、30属,其中褐梅属(Melanelia Essl.)、石蕊属(Cladonia Wigg.)、地卷属(Peltigera Willd.)等地衣种类较多,分别占9.33％,10.67％,13.33％.在该地区分布的地衣科目中茶渍目占优势,其科、属、种数分别占该地区地衣总数的68.75％,73.33％,69.33％.根据地衣对环境的适应特征和选择性,将新疆额尔齐斯河大峡谷地衣的地理成分可划分为世界广布成分(20.00％)、环北极成分(26.67％)、温带成分(45.33％)、东亚成分(5.33％)和中国特有种(2.67％)等5个分布类型.其中温带成分和环北极成分占该地区地衣总种数的72.00％,占优势地位. 相似文献
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M. SARFRAZ S. M. MEHDI G. HASSAN S. T. ABBAS 《土壤圈》2007,17(1):130-136
A research study was carried out to determine the electrical conductivity （EC）, residual sodium carbonate （RSC）, sodium adsorption ratio （SAR）, pH and metals in metal-polluted irrigation water from a nullah and those in soils over a period of time, and the effect of metals on rice yield and metal concentrations in rice grain and straw. Two sites （I and If） were selected on the bank of Nullah Dek at Thatta Wasiran in Sheikhupura District （Pakistan）, with two rice varieties, Super Basmati and Basmati 385, at both sites. Water samples were collected during rice crop growth at 15-day intervals from August 3 to November 1, 2002. The results showed that Nullah Dek water had an EC 〉1.0 dS m^-1 and RSC of 2.78-4.11 mmolc L^-1, which was hazardous for crops, but the SAR was within the safe limit. Cu, Mn Cd and Sr were also within safe limits. The soil analysis showed that Site Ⅱ was free from salinity/sodicity, whereas Site Ⅰ was saline sodic. Among metals, Zn was sometimes deficient, Cu, Mn and Fe were adequate, and St, Ni and Cd were within safe limits in the soil at both the sites. After the rice crop harvest, concentrations of all metals tested were usually slightly increased, being higher in the upper soil layer than the lower. In addition, Basmati 385 produced higher rice grain and straw yield than Super Basmati. Chemical analysis of rice grain indicated the presence of Zn, Cu, Fe, Mn, Pb and Sr, whereas rice straw contained Zn, Cu, Fe, Mn and Sr, with Cd and Ni both being found in minute quantities. 相似文献
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Corn field experiments with two treatments, NP and NPK, where N in the form of urea, P in the form of calcium phosphate, and K in the form of KCl were applied at rates of 187.5, 33.3, and 125 kg ha^-1, respectively, on soils derived from Quaternary red clay were conducted in the hilly red soil region of Zhejiang Province, China. Plant grains and stalks were collected for determination of K content. Seven equations were used to describe the kinetics of K release from surface soil samples taken before the corn experiments under electric field strengths of 44.4 and 88.8 V cm^-1 by means of electro-ultrafiltration （EUF） and to determine if their parameters had a practical application. The second-order and Elovich equations excellently described K release; the first-order, power function, and parabolic diffusion equations also described K release well; but the zero-order and exponential equations were not so good at reflecting K release. Five reference standards from the field experiments, including relative grain yield （yield of the NP treatment/yield of the NPK treatment）, relative dry matter yield （dry matter of the NP treatment/dry matter of the NPK treatment）, quantity of K uptake in the NP treatment （no K application）, soil exchangeable K, and soil HNO3-soluble K, were used to test the effectiveness of equation parameters obtained from the slope or intercept of these equations. Correlations of the ymax （the maximum desorbable quantity of K） in the second-order equation and the constant b in the first-order and Elovich equations to all five reference standards were highly significant （P ≤ 0.01）. The constant a in the power function equation was highly significant （P 〈 0.01） for four of the five reference standards with the fifth being significant （P ≤ 0.05）. The constant b in the parabolic equation was also significantly correlated （P ≤ 0.05） to the relative grain yield and soil HNO3-soluble K. These suggested that all of these parameters could be used to estimate the soil K supplying capacity and the crop response to K fertilizer. 相似文献
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