为了获得完整、高纯度的竹林土壤微生物总DNA,采用改良的十二烷基硫酸钠-高盐抽提法对5种竹林土壤进行DNA提取,通过DNA凝胶回收试剂盒纯化粗提的DNA,利用细菌16 S rDNA基因的V3区引物对纯化的DNA进行了聚合酶链式反应-变性梯度凝胶电泳(...
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为了获得完整、高纯度的竹林土壤微生物总DNA,采用改良的十二烷基硫酸钠-高盐抽提法对5种竹林土壤进行DNA提取,通过DNA凝胶回收试剂盒纯化粗提的DNA,利用细菌16 S rDNA基因的V3区引物对纯化的DNA进行了聚合酶链式反应-变性梯度凝胶电泳(PCR-DGGE)验证。结果表明,该方法所需土壤样品少,抽提的DNA片段均在23kb以上,完整性好;采用DNA凝胶回收试剂盒纯化能够有效去除粗提DNA中大部分杂质,获得高质量的DNA;以此DNA为模板进行DGGE检测所反映的微生物信息量丰富。
以山核桃Carya cathayensis花后60,75和100d的幼胚为外植体,金属硫蛋白(MT)复合维生素+20g·L-1葡萄糖+10mg·L-1腺嘌呤+500mg·L-1水解酪蛋白作为基本培养条件,研究山核桃幼胚的不同发育时期,不同植物生长调节物质及基本培养基对山核桃不定芽诱导的影响。结果表明,山核桃花后60d的幼胚培养56d后未形成不定芽,花后100d的幼胚比花后75d的幼胚诱导产生的不定芽多而且长;植物生长调节物质对山核桃不定芽诱导以0.0100mg·L-14-氨基-3,5,6-三氯吡啶羧-酸(Picloram)+3.0mg·L-16-苄氨基腺嘌呤(6-BA)为启动培养基较佳;当6-BA质量浓度一定时,随Picloram质量浓度增加不定芽数量差异不显著;当Picloram质量浓度一定时,随6-BA质量浓度增加,产生不定芽数逐渐上升,但当6-BA达10mg·L-1时,不定芽出现明显玻璃化现象;2,4-D的添加不利于外植体不定芽产生;MS(Murashige and Skoog)是最佳基本培养基。
To provide the scientific basis for establishing the efficient cultivation and management measures of Torreya grandis cv.’Merrillii’,the process of the female flower bud differentiation was studied with the paraffin...
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To provide the scientific basis for establishing the efficient cultivation and management measures of Torreya grandis cv.’Merrillii’,the process of the female flower bud differentiation was studied with the paraffin *** indicated that the ovulating strobilus differentiation of *** cv.`Merrillii’ was mainly in the winter and the early *** ovulate strobilus formed in the middle and upper part of young tips of the *** primordia appeared in early November before which there was no distinction in the dissected shape between the mixed-bud and the nutrition *** the developments of bract,ovule scale,nucellus and integument,the strobilus started to blossom in the next mid-April and entered in a period of free nucleus of endosperm without formed female gametophyte and *** whole process lasted about 160 *** illumination and themoisture in summer and autumn were main conditions to affect the female flower bud differentiation.
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