排序方式: 共有197条查询结果,搜索用时 31 毫秒
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紫色马铃薯是一种集营养、保健、观赏于一身的彩色马铃薯新品种,除具有细腻香面的上佳品质、色泽鲜艳的独特外观之外,又富含维生素E、维生素C、淀粉等营养成分。它还含有一种功能独特,具有保健、药用价值的物质叫"花青素"。针对‘黑美人’紫色马铃薯在景宁当地种植过程中的生育期、抗逆性、经济效益等方面的表现,综合实施科学栽培,初步掌握了‘黑美人’紫色马铃薯在土壤选择、种薯处理、播种、田间管理、病虫害防治、收获等栽培技术要点。 相似文献
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侧孢芽孢杆菌的抑藻效应及对养殖水体中蓝藻水华的生态防控 总被引:4,自引:0,他引:4
以一株侧孢芽孢杆菌(Brevibacillus laterosporus)为试验菌株,研究其对铜绿微囊藻(Microcystis aeruginosa)的抑制效应,并将其应用于水产养殖富营养化水体中,进行蓝藻水华的生态控制。结果表明,侧孢芽孢杆菌可以抑制铜绿微囊藻的生长,使其叶绿素a的含量显著下降,从而抑制了其光合作用的活性,达到限制铜绿微囊藻细胞增殖的目的。这种抑制作用与侧孢芽孢杆菌的细菌含量成正比,初始接种的菌体浓度越高,抑制作用越强,且这种限制作用在菌藻接触后的8~10 d较为显著。将活菌数≥108个/mL的侧孢芽孢杆菌按0.50、1.00 mg/L的用量加入淡水池塘养殖的富营养水体,在60 d内不仅可使养殖水体中的TN、TP和高锰酸盐指数有所下降,同时还可显著抑制藻类的数量,增加藻类的种类,提高养殖水体中藻类的Shannon-Weaver多样性指数,较好地调节藻类群落结构。研究显示,侧孢芽孢杆菌因具有较强的抑藻能力,在生物修复养殖富营养化水体的水生生态系统方面有着良好的应用前景。 相似文献
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黑土肥力的演变过程和评价指标体系研究 总被引:1,自引:0,他引:1
土壤肥力评价是对土壤肥力高低的评判和鉴定,不同区域土壤肥力的评价指标各异。综述了黑土肥力的演变过程和评价指标及评价方法,对黑土肥力的相关指标进行重点研究和筛选,确定农田黑土的评价指标和评价方法;分析黑土肥力的评价指标体系的构成以及评价方法的选取,对黑土区的农业生产具有非常重要的理论意义和现实意义。 相似文献
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XU Qijiang CHEN Dian TONG Youli and LI Yuhua* Research Institute of Flower Biotechnology Northeast Forestry University Harbin China College of Horticulture Northeast Agricultural University Harbin China 《东北农业大学学报(英文版)》2007,14(1):9-13
Three pairs of primers were designed and synthesized from nucleotide sequences of garlic latent virus (GLV), onion yellow dwarf virus (OYDV), and leek yellow stripe virus (LYSV) by using PCR primer design software. The expected fragments about 170 bp, 287 bp, and 191 bp were amplified by RT-PCR for GLV, OYDV, and LYSV, respectively in disease-infected plants of potato onion (Allium cepa L., Aggregatum group), but such fragments were not obtained from healthy-looking plants and virus-free seedlings of shoot-tips. The amplified products of GLV, OYDV and LYSV were cloned into pGEM-T vectors, and transformed into Escherichia coli. JM109. The recombinant plasmids were obtained and sequenced. The nucleotide sequences were compared with corresponding viral nucleotide sequences reported in GenBank by performing a NCBI BLAST. The analysis showed that their homology attained 75% to 90%,89.5% to 96.1%,and 91.6% to 96.3% in GLV, OYDV, and LYSV, respectively. The total RNA of 6.34 μg·μL~(-1) from infected plants was diluted to a series of 10~(-1) to 10~(-5) and the detection sensitivity of RT-PCR was 10~(-4) (about 4 ng). Thus, a method of identification and detection by RT-PCR of GLV, OYDV, and SLYV was established. 相似文献
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随着城镇化的快速推进和城市规模的扩张,城市道路景观越来越受到人们的重视,如何将地域文化融入城市道路景观成了提升道路景观的突破口。本文以内江市学院路景观设计为例,阐述了蕴含地域文化的城市道路景观的概念及其重要性,并通过"主题介入"式的分段景观设计,探索了城市道路景观的地域文化表达方法。旨在提高人们对蕴含地域文化的城市道路景观的重视,并通过合理的方法进行设计,提升城市道路景观的品质与内涵,营造具有个性与特色的城市景观。 相似文献
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QIN Qingfeng HE Wei LIANG Jun ZHANG Xingyao * . College of Resources Environment of Beijing Forestry University Beijing P.R.China . Research Institute of Forest Ecology Environmental Protection CAF Beijing P.R.China 《中国林业科技(英文版)》2005,4(2):87-94
1 INTRODUCTIONPlants have several defense mechanisms againstpathogenic attack, one of which is through proteaseinhibitors proteins. Cystatins are a group of proteinsthat act as inhibitors of cysteine proteinases and widelyexist in plants, animals, and microbes. Plant cystatinshave been well characterized in rice (Abe K, et al,1985); maize (Abe M, et al, 1988); cowpea(FernandesK V S, et al, 1991); sunflower (Kouzuma Y, et al,1996); sorghum(Li C, et al, 1996); soybean(MisakaT, et al, 1… 相似文献