加拿大一枝黄花入侵机理及控制策略     

唐路恒  马利民 《安徽农业科学》2015,(21):138-139

从遗传特征、繁殖特征、生理生态特点、环境的可入侵性、人类活动干扰、化感作用、与土壤微生物的作用7个方面介绍了加拿大一枝黄花的入侵机理,并提出了机械防治、化学防治、生物防治等控制策略.  相似文献   

Effect of FGFR1 expression knock-down on biological characteristics of infantile hemangioma endothelial cells     

XU Nan  XU Jie  LI Han  QIAN Li-juan  LI Zhong-tang 《园艺学报》2019,35(3):418-423

AIM: To study the effect of fibroblast growth factor receptor 1 (FGFR1) expression knock-down on the viability, apoptosis, invasion and migration of infantile hemangioma endothelial cells (HemECs). METHODS: FGFR1 was down-regulated by FGFR1 small interfering RNA (si-FGFR1) transfection. The viability of the cells was measured by CCK-8 assay. The apoptotic rate was analyzed by flow cytometry and the invasion and migration abilities were determined by Transwell assay. The protein levels of phosphatidylinositol 3-kinase (PI3K), protein kinase B (AKT), and phosphorylated AKT (p-AKT) were examined by Western blot. RESULTS: Transfection of si-FGFR1 into HemECs had significant effects on inhibiting cell viability (P<0.05), promoting apoptosis (P<0.05), and decreasing cell invasion and migration abilities (P<0.05). The results of Western blot showed that knockdown of FGFR1 gene expression in the cells reduced the protein levels of PI3K and p-AKT (P<0.05), and had no significant effect on AKT protein level. CONCLUSION: Knock-down of FGFR1 expression changes the biological characteristics of endothelial cells in infantile hemangiomas by regulating PI3K/AKT signaling pathway.  相似文献   

转基因植物潜在的生物入侵问题   总被引：9，自引：0，他引：9  

张秀娟  杨晨利 《河南科技大学学报(农学版)》2004,24(1):72-75

通过对转基因植物安全性和外来物种的生物入侵问题的研究发现，转基因植物作为自然界中本来不存在的外来物种，由于其自身的生态幅宽、繁殖能力强等竞争优势，可以通过花粉散布、种子扩散和杂交等途径造成外缘基因的逃逸，从而导致其对生态环境及生物多样性产生一定的影响。  相似文献   

柑橘园柑橘小实蝇入侵扩散规律与危害动态模型研究     

李达林  汪恩国 《农学学报》2011,(8)

为了探索柑橘小实蝇入侵扩散与危害规律,提高其监测与防控水平,2008—2010年应用柑橘小实蝇专用性诱剂和诱捕器,在全市19个镇(街道)35个柑橘园建立监测点进行全市性入侵扩散分布普查;在古城伏龙柑橘园和市区水果市场,建立2个系统监测点开展全年种群数量消长监测,结果表明柑橘小实蝇种群入侵扩散与时空分布呈塔型趋势,即以城区为中心,并呈向周边区域扩散蔓延趋势;全年种群时序数量变化主要呈单峰型曲线变化,一般于6月中下旬至7月上中旬初见性诱成虫,8月上旬形成增长拐点,9—10月形成数量高峰,影响种群数量消长的主要因子有种群基数、气候和生境条件等,从而创建柑橘小实蝇基数(m6)与全年种群诱量(M)关系模型M=23.8339m6+59.8003(n=6,r=0.9735**)、当旬虫口密度(mn)与其前3个月的旬平均气温(tn-9)关系模型mn=1.9248tn-9-14.88063(n=72,r=0.5123**),以及柑橘挂果期成虫诱量(M)、有虫株率(R%)、有虫果率(P%)、每虫果幼虫量(N)等关系模型:R=0.3667M-1.2746(n=11,r=0.8901**);P=0.0581R+0.3112(n=11...  相似文献   

外来入侵动物   总被引：1，自引：1，他引：0  

杨小林  王德良 《江西农业学报》2007,19(6):125-127,130

介绍了入侵我国的有害动物种类和途径,并就动物入侵对我国造成的危害以及防治措施等进行了论述。  相似文献   

中华绒螯蟹在欧州   总被引：5，自引：3，他引：5       下载免费PDF全文

堵南山 《水产科技情报》2003,30(1):7-9

分析了中华绒螯蟹侵移欧洲的过程，介绍了该种群目前在欧洲的分布情况。  相似文献   

Progress of ELMO family on malignant tumor invasion and metastasis     

GUO Cheng-ming  PENG Hui-yun  LUO Wen  YU Qiong-fang  GAO Dian 《园艺学报》2015,31(12):2296-2300

It is one of the main characters of malignant tumors that malignant tumor cells invade surrounding tissues and metastasize to distant tissues. Multiple factors are involved in this complicated dynamic process. Metastasis is the major factor influencing recurrence and prognosis. Therefore, it is important to explore the mechanism of invasion and metastasis for reducing recurrence rate and mortality of malignant tumors. Engulfment and cell mobility (ELMO) family is one kind of conserved protein in evolutional process. It includes 3 members, ELMO1, ELMO2 and ELMO3. The members of ELMO family play an important role in cell phagocytosis and cell migration, and they also have close correlation with malignant tumor cell invasion and metastasis. In this paper, we review the progress of the relationship between ELMO family and malignant tumor invasion and metastasis.  相似文献   

Recovery of native plant communities after the control of a dominant invasive plant species, Foeniculum vulgare: Implications for management     

Jennifer A. Erskine Ogden  Marcel Rejmánek 《Biological conservation》2005,125(4):427-439

The control and/or removal of a dominant invasive species is expected to lead to increases in native species richness and diversity. Small pilot studies were performed on Santa Cruz Island (SCI), California, in the early 1990s to test the efficacy of different methods on the control of Foeniculum vulgare (fennel) and management’s effects on native species recovery. We chose a treatment that showed significant native species recovery, applied it at the landscape scale, and followed its effects on fennel infested plant communities. We tested the hypothesis that results from small-scale studies translate to the landscape level. We found that although the control of fennel translated from the small to landscape scale, decreasing from an average of 60% to less than 3% cover, native species recovery did not occur in the landscape study as it did in the pilot studies. Invasive fennel cover was replaced by non-native grass cover over time. Unexpectedly, fennel cover in untreated fennel plots decreased significantly (though not as drastically) from over 60% cover to just under 40% cover while native species richness in untreated areas increased significantly. The correlation between precipitation and changes in native and non-native species richness and abundance in this study imply that changes in species abundances were highly correlated with environmental fluctuations. The lack of a native seedbank and the accumulation of non-native grass litter likely prevented the recovery of native species in treated areas. Greater vertical complexity found in fennel communities, which increased visitation by frugivorous birds and likely increased native seed dispersal, may have been responsible for the increase in native species richness in the untreated areas. These results suggest that successful invasive species control and native species recovery experiments conducted at small scales may not translate to the landscape level, and active restoration should be an organic component of such large-scale projects.  相似文献   

Persistent Acacia savannas replace Mediterranean sclerophyllous forests in South America     

Paul Van de Wouw  Cristian EcheverríaJosé María Rey-Benayas  Milena Holmgren 《Forest Ecology and Management》2011,262(6):1100-1108

Mediterranean ecosystems are global hotspots of biodiversity threaten by human disturbances. Growing evidence indicates that regeneration of Mediterranean forests can be halted under certain circumstances and that successional stages can become notoriously persistent. The Mediterranean sclerophyllous forest in central Chile is been largely transformed into savannas dominated by the invasive legume tree Acacia caven as result of interacting management and ecological factors. We used multi-temporal satellite imagery to study the transition dynamics of these major vegetation types over the last four decades (1975-2008). Vegetation changes were related to indicators of resource availability (topography, water availability, solar radiance), potential propagule availability (distance to forest remnant patches) and disturbance regimes (grazing, fire occurrence and distance to roads and cities). During this study period, forests were mostly converted into Acacia savannas (46.1%). Acacia savanna was the most persistent natural vegetation type. The probability of sclerophyllous forest degradation into Acacia savanna increased on drier northern-exposed slopes, close to roads and further away from forest remnants. In contrast, forest regeneration from Acacia savanna was higher on moister southern-exposed slopes and closer to forest remnants. Acacia savannas are increasingly being converted into cultivated land on the moister locations or switching into a bare soil state in locations close to cities and further away from forest remnants. These results highlight the vulnerability of diverse sclerophyllous forests and its increasing conversion into persistent Acacia savannas in the Mediterranean region of central Chile and identify the ecological conditions for successful conservation and restoration of the native sclerophyllous forest vegetation that can be used for sensible land use planning.  相似文献   

我国生物多样性法律保护制度的建立和完善   总被引：11，自引：0，他引：11  

陈晗霖  黄明健 《安徽农业科学》2005,33(2):358-360

针对我国生物多样性法律保护制度存在的不足之处 ,提出弥补立法漏洞 ,加大执法力度 ,建立完善的生物多样性法律保护体系  相似文献