共查询到20条相似文献,搜索用时 62 毫秒
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《经济林研究》2014,(2)
为了研究不同提取方法对芒果总DNA提取质量的影响,以‘紫花芒’等11个芒果品种的叶片为材料,采用SDS法、CTAB法、改良CTAB法提取芒果叶片总DNA,并对提取的总DNA浓度、OD260/280、OD260/230、琼脂糖电泳结果、ISSR扩增产物进行了比较分析。结果表明,改良CTAB法能较好地去除芒果叶片中的多酚、多糖、单宁和色素等杂质。提取的总DNA浓度高达387 ng/μL,OD260/280在1.81~1.87之间,OD260/230在2.01~2.09之间。SDS法、CTAB法提取总DNA的ISSR扩增产物条带少,改良CTAB法提取的总DNA的扩增效果图谱清晰,多态性高。3种提取方法的结果比较而言,以改良CTAB法提取总DNA的效果最好,可用于后续实验的研究。 相似文献
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松材线虫病双基因检测方法的建立 总被引:1,自引:1,他引:0
《湖北林业科技》2021,(2)
采用松材线虫的核糖体DNA的内转录区序列及cathepsin L-like cysteine proteinase为目的片段设计2对引物,建立了可特异性检测松材线虫的双基因PCR检测法。利用这2对引物,松材线虫可扩增出大小分别为490 bp及264 bp的产物,而其他对照组均无扩增。此检测方法经过实际应用检验,灵敏度与常规PCR一致,而特异性更高,可以应用于实验室的常规检测需求。 相似文献
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不同提取方法的铁线莲属叶片总DNA提取效果 总被引:1,自引:0,他引:1
以铁线莲属植物的叶片为材料,采用CTAB-SDS法、简易CTAB法、改良CTAB法等3种提取方法,比较耗时、纯度、得率、浓度和质量等指标,以期为铁线莲属植物叶片总DNA的提取筛选适宜方法.结果表明,在纯度和浓度方面CTAB-SDS法>简易CTAB法>改良CTAB法,在节省提取时间方面改良CTAB法>CTAB-SDS法>简易CTAB法.以CTAB-SDS法所提取的9种铁线莲DNA为模板,进行PCR扩增,CTAB-SDS法提取的DNA得率高、质量好,PCR扩增成功率也较高.综合比较,采用CTAB-SDS法进行铁线莲属叶片总DNA提取效果更佳. 相似文献
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松墨天牛携带的松材线虫PCR检测技术 总被引:3,自引:0,他引:3
利用本研究筛选出的一对松材线虫特异性PCR引物(上游引物:5'-CTACGTGCTGTTGTTGAGTTGGC-3',下游引物:5'-TGGTGCCTAACATTGCGCGA-3'),从松材线虫DNA中,扩增出一条长度403 bp(基因库登陆号:DQ855275)的特异性DNA片段.该引物可以将松材线虫DNA与松墨天牛组织以及拟松材线虫、畸刺伞滑刃线虫、变异伞滑刃线虫、小角伞滑刃线虫、利昂伞滑刃线虫、湖南伞滑刃线虫、红松滑刃线虫、滑刃属线虫、斯坦纳长尾线虫、小茎线虫、剑尾齿杆双胃线虫和寄生小杆属线虫等12种线虫的DNA区分开来.在此基础上,建立一套利用PCR技术直接从受感染的松墨天牛组织中检测出松材线虫的技术,并在实际运用中得到检验. 相似文献
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We present a new approach for selecting seed sources of Eucalyptus to be grown on saline land. We evaluated our method using 22 seed sources, 11 tree-form species and 11 mallee-form species.
We found that the commonly used strategy of selecting seed sources on the basis of average productivity was inappropriate,
as average productivity was poorly correlated with the relationship between productivity and salinity that was actually observed.
Using our new approach, we categorized seed sources as salt-sensitive or salt-tolerant based on the strength of the observed
relationship between salinity and productivity. Seed sources defined as sensitive were associated with relatively large (−24.8
to −64.2%) productivity losses, while the changes in productivity for tolerant seed sources ranged from −17.1 to 10.5%. On
average, reductions in height due to increased salinity were about 30% greater for sensitive seed sources than tolerant ones,
although the effect was smaller for mallee-form and greater for tree-form seed sources. The difference between sensitive and
tolerant seed sources was similar after 1, 2 and 4 years of growth. 相似文献
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12个桃品种的花芽休眠需冷量和开花需热量 总被引:3,自引:0,他引:3
在浙西南地区研究12个桃品种花芽休眠需冷量和开花需热量生态指标.犹他模型测定结果显示:12个桃品种中,花芽休眠需冷量低的品种为春蜜、超红、中油11号、中油7号、中油4号,约为550~650 cu;其次是丽油5号、仓方早生、燕红、丽油3号、早凤凰,约为650~ 800 cu;需冷量高的品种为新川中岛和赤月,约为900~ 950cu.同一地区不同品种需热量差异较大,同一品种年际间差异相对较小.以生长度天模型试验结果表明:开花需热量低的品种为赤月和丽油3号,大约400 ~ 500 d·℃;其次是新川中岛,大约500~600 d·℃;春蜜、丽油5号、早凤凰、中油4号、中油7号、仓方早生和燕红大约600 ~ 700 d·℃;需热量较高的是中油11号和超红,约为700~800 d·℃.12个桃品种花芽休眠需冷量与开花需热量之间呈乘幂函数曲线显著负相关. 相似文献
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王珊子 《绿色中国(A版)》2006,(15):66-68
“民以食为天”,“人命关天”,这两句古话阐明了食品安全无以复加的重要性。实际上,食品安全的重要性还远不止于此,这个问题不仅关系到人的健康和生命,而且关系到经济发展、社会稳定,乃至公民对整个社会和政府的信心。 相似文献
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王珊子 《绿色中国(综合版)》2006,(8):66-68
“民以食为天”,“人命关天”,这两句古话阐明了食品安全无以复加的重要性。实际上,食品安全的重要性还远不止于此,这个问题不仅关系到人的健康和生命,而且关系到经济发展、社会稳定,乃至公民对整个社会和政府的信心。[编者按] 相似文献
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《Journal of Sustainable Forestry》2013,32(3-4):307-316
Concerns for maintaining biodiversity have led to the adoption of ecosystem management as the paradigm for federal land management. This approach will identify desired future conditions as the goal for management, based on ecological objectives for a given landscape. Some management efforts attempt to identify desired future conditions based on existing successional stages as defined by a classification of overstory vegetation types. Such an approach ignores most of the underlying ecological parameters of the landscape, and is inadequate for identifying past disturbance regimes and future successional pathways. An assessment of desired future conditions based on an ecological classification system is essential to overcome these inadequacies. The strategy proposed in this paper uses an appropriate ecological land classification, based on either ecological land types or habitat types, included in a broader hierarchical classification system. It also uses a vegetation map of existing overstory vegetation. These two maps are overlaid to generate polygons of ecological units that can then be used to create an ecosystem diversity matrix. Each polygon (stand) can be evaluated as to its composition and structure relative to its possible placement within the ecosystem diversity matrix through comparisons with historical ranges of variability. The overall ecosystem diversity matrix can then be examined in terms of the distribution of successional stages within each habitat type or ecological land type. The goal should be to maintain at least adequate ecological representation of all successional stages within each habitat type that occurred historically, based on past disturbance regimes. Adequate ecological representation is defined as sufficient size and distribution of inherent ecosystems to maintain viable populations of all endemic species dependent on these ecosystems. This approach can maintain and enhance regional biodiversity, but also maintain flexibility in land management options. 相似文献