排序方式: 共有99条查询结果,搜索用时 15 毫秒
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选取新几内亚凤仙具有顶芽或腋芽的茎段为外植体,诱导芽体萌发,进行繁殖培养。通过实验对比分别筛选出诱导芽分化和诱导生根的最佳培养基。实验结果表明:不同的激素水平对几内亚凤仙组培苗的生长有着显著的影响。其中最适宜的分化培养基为MS+6-BA0.5 mg/L+NAA0.1 mg/L;最适宜的生根培养基为1/2 MS+IAA0.5 mg/L;最适宜的栽培基质为蛭石+草炭+珍珠岩(5∶3∶2),成活率为95%。 相似文献
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采用室内水培试验,以不同浓度(10,20,30,40,50,60,70 mmol/L)的Na2CO3对非洲凤仙种子和幼苗进行胁迫处理,测定其种子发芽率、发芽指数、发芽势和叶绿素含量等指标.结果表明:各项指标与Na2CO3胁迫浓度呈明显负相关.当Na2CO3浓度达到50 mmol/L时,发芽率、发芽指数和发芽势显著下降,说明高浓度Na2CO3溶液对种子的萌发具有强烈的抑制作用.Na2CO3胁迫使叶绿素含量显著降低,严重影响幼苗的光合能力,抑制幼苗的正常生长. 相似文献
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为了解新疆天山野果林中塞威士苹果Malus sieversii与其林下伴生植物短距凤仙花Impatiens brachycentra两种植物叶斑病病原菌的多样性及同源性,采用组织分离法获得病原菌,基于rDNA-ITS序列构建系统发育树,并进行ITS序列BLAST同源性比对,对病原菌进行鉴定分类,并依据科赫氏法则测定致病性。结果显示,从新疆新源县天山野果林中的塞威士苹果及短距凤仙花病叶上共分离得到18株菌落形态各异的病原菌,分属于2属4种,绝大多数属于半知菌亚门。其中,链格孢属Alternaria sp.为塞威士苹果和短距凤仙花叶斑病病原真菌中的优势菌群。致病性测定结果显示,其中11株病原真菌对塞威士苹果具有致病性,7株病原真菌对短距凤仙花具有致病性;塞威士苹果所有的病原真菌对短距凤仙花均有致病性,而且短距凤仙花所有的病原真菌对塞威士苹果也有致病性。推测2种植物叶斑病可能由相同来源的病原真菌引发,短距凤仙花染病加剧了塞威士苹果叶斑病暴发,可能是野果林退化的重要原因。 相似文献
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Top 20 environmental weeds for classical biological control in Europe: a review of opportunities, regulations and other barriers to adoption 总被引:4,自引:3,他引:4
Classical biological control remains the only tool available for permanent ecological and economic management of invasive alien species that flourish through absence of their co‐evolved natural enemies. As such, this approach is recognized as a key tool for alien species management by the Convention on Biological Diversity (CBD), the European and Mediterranean Plant Protection Organization (EPPO) and the European Strategy on Invasive Alien Species (ESIAS). Successful classical biological control programmes abound around the world, despite disproportionate attention being given to occasional and predictable non‐target impacts. Despite more than 130 case histories in Europe against insect pests, no exotic classical biological control agent has been released in the EU against an alien invasive weed. This dearth has occurred in the face of increasing numbers of exotic invasive plants being imported and taking over National Parks, forests and amenity areas in this region, as well as a global increase in the use of classical biological control around the world. This paper reviews potential European weed targets for classical biological control from ecological and socioeconomic perspectives using the criteria of historical biological control success, taxonomic isolation from European native flora, likely availability of biological control agents, invasiveness outside Europe and value to primary industry and horticulture (potential for conflicts of interest). We also review why classical biological control of European exotic plants remains untested, considering problems of funding and public perception. Finally, we consider the regulatory framework that surrounds such biological control activities within constituent countries of the EU to suggest how this approach may be adopted in the future for managing invasive exotic weeds in Europe. 相似文献
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通过比较普通开放式贮藏、0~4℃冷冻贮藏和硅胶干燥贮藏条件下的凤仙花种子的活力和细胞膜完整性的变化,发现硅胶干燥贮藏能保持凤仙花种子较高的活力和细胞膜结构的完整性,是一种理想的贮藏方法。 相似文献
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新几内亚凤仙组培快繁技术研究 总被引:2,自引:0,他引:2
通过对新几内亚凤仙组织培养及入土移栽的技术研究,分别筛选出诱导芽分化的最适培养基和诱导生根的最适培养基。试验结果表明,不同的激素浓度对新几内亚凤仙组培苗的生长效果有着较大的影响,最适宜的诱导芽分化的培养基为MS+NAA0.3mg.L^-1 6-BA0.8mg.L^-1,诱导率为90%,最适宜的生根培养基为1/2MS+NAA0.3mg.L^-1,生根率为93.3%,最适宜的移栽基质为蛭石+粗砂(1:1),成活率为87%。 相似文献
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采用浓度为0%、0.2%、0.4%、0.6%、0.8%、1.0%的NaCl、Na2CO3、NaHCO3单盐胁迫凤仙花种子,通过对种子萌发特性的观察,研究不同盐分对其危害程度。结果表明:3种盐胁迫对凤仙花种子的萌发时滞、发芽率、发芽势、生长速度的影响差异明显。相同浓度下,Na2CO3胁迫时发芽率和生长速度受到显著抑制,NaCl胁迫时,发芽和生长受到的影响较小;NaHCO3胁迫时受到的抑制介于中间。综合分析,3种盐对凤仙花种子萌发影响的强弱顺序为:Na2CO3NaHCO3NaCl。 相似文献
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