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Tissue Nitrogen and Fructan Translocation in Bread Wheat 总被引:5,自引:0,他引:5
HOU You-liang L.O‘Brien ZHONG Gai-rong 《中国农业科学(英文版)》2002,1(9):988-993
Translocation of previously accumulated nitrogen and carbohydrates from vegetative tissue of the wheat plant is a major assimilate source for grain filling. This study was conducted to examine genotype differences in nitrogen and fructan translocation and their relationships to grain yield and protein content. Effects indicated that significant genotype differences existed for nitrogen accumulation at anthesis and fructan at milk stage and their translocation. Two high protein genotypes, Cunningham and PST90-19, accumulated more nitrogen before anthesis and had greater nitrogen translocation, but lower post-anthesis nitrogen uptake,than two low protein genotypes, SUN109A and TM56. Among plant parts, leaves were the major storage for tissue nitrogen and provided the overwhelming proportion of the total nitrogen translocation, whereas for fructan accumulation and translocation it was the stems. The two high protein genotypes had a higher percentage of their grain nitrogen derived from nitrogen translocation, while for the two low protein ones, it was from postanthesis nitrogen uptake and assimilation. Increasing nitrogen application increased nitrogen accumulation and translocation, but decreased fructan accumulation and translocation. High grain protein content was associated with high nitrogen translocation from leaves, stems and the total plant, while high grain yield was related to high fructan translocation from stems and the total plant. Fructan translocation was negatively correlated to grain protein content. Nitrogen and fructan translocation were not correlated with each other. 相似文献
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克拉维酸强化的阿莫西林对致病性大肠埃希氏菌体外抑菌试验 总被引:7,自引:0,他引:7
克拉维酸是一种β-内酰胺酶抑制剂,与阿莫西林同时应用时使得通过产生β-内酰胺酶对阿莫西林耐药的大多数细菌重新成为敏感菌。对来源于鸡、猪的共31株致病性大肠埃希氏菌最小抑菌浓度(MIC)测定表明,70%以上菌株对阿莫西林耐药;克拉维酸与阿莫西林联合使用使MIC显著下降;与单一使用阿莫西林相比,头孢氨苄青霉素对大多数分离菌的MIC较低。 相似文献
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基于科技创新链的农业科技创新能力的影响因素探讨 总被引:3,自引:0,他引:3
在运用现有科技创新推动模型的基础上,引入"短板原理"和"快速反应原理",对农业科技创新链的研究开发阶段、示范推广阶段和产业化阶段以及贯穿于这些环节的科技创新环境进行影响因素分析,提出以瓶颈环节的农业科技创新能力、农业科技创新链各环节经历的时间长短和推广范围、对当地的现时贡献和对整个农业产业的未来贡献,作为评价整体农业科技创新链的综合创新能力,并据此提出了一系列的影响因素和判断主要影响因素的基本标准。 相似文献
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金针菇种质资源的SRAP分析 总被引:1,自引:1,他引:1
应用SRAP对金针菇种质资源进行评价.选用多态性好的7对SRAP引物对30个来源不同、各具代表性的供试菌株进行PCR,共获得92条重复性良好的DNA条带,其中多态性条带79条,占85.9%;用SPSS软件计算相似系数和进行平均法聚类分析,白色菌株之间遗传差距较小,黄色菌株之间遗传差距大,30个供试菌株可分为14类.本研究还表明,SRAP具有高效、稳定、重复性好的特点,可应用于遗传连锁群构建、品种鉴别及分子标记辅助育种等研究. 相似文献
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鲍的生物学特征及主要养殖方式和病害防治技术 总被引:1,自引:0,他引:1
论述了鲍的生物学和目前国内鲍养殖的主要模式和病害防治方法,为鲍养殖业的发展提供了一定的借鉴依据。 相似文献
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