排序方式： 共有14条查询结果，搜索用时 734 毫秒
1.
Marlene Cordero Pedro L. Ramos Lester Hernández Ana I. Fernández Ana L. Echemendía Rudy Peral Gloria González Daniel García Surey Valdés Ana Estévez Keren Hernández 《Phytoparasitica》2003,31(5):478-489
The presence of a begomovirus in potato plants with yellow mottle symptoms was determined for the first time in Cuba. The
incidence of typical begomovirus-like symptoms in potato plants in some regions of Havana province (Güira de Melena, San José
de las Lajas, Güines and Boyeros) during the growing seasons from 1992 to 1998 was in general low. However, in some cultivars
belonging to the National Program for Potato Genetic Improvement, the incidence reached 100%. Yield losses, determined in
1992 and 1994, ranged as high as 19% to 56.33% depending on the cultivar. Characterization of the causal agent was done by
light microscopy, host range (graft and mechanical transmission), DNA hybridizations, polymerase chain reaction, and restriction
fragment length polymorphism analysis. Nucleotide sequence of the amplified fragments revealed the presence ofTomato mottle Taino virus. The virus was transmittedvia tubers and has been detected in mixed infections withPotato virus X and withPotato leaf roll virus.
http://www.phytoparasitica.org posting Oct. 20, 2003. The first two authors contributed equally to this work. 相似文献
2.
从海南省杂草胜红蓟和假马鞭上检测到粉虱传双生病毒 总被引：9，自引：0，他引：9
利用三抗体夹心ELISA(TAS-ELISA)及PCR检测的方法对采自海南的胜红蓟(Ageratum conyzoides)和假马鞭(Stachytarphetajamaicensis)的5个病样进行了检测,表明均为粉虱传双生病毒。PCR扩增产物克隆后进行序列测定,结果表明存在2类双生病毒,其中样品Hn2存在2类病毒的复合侵染。这是在海南首次报道存在有粉虱传双生病毒。 相似文献
3.
Virus isolates GD6, GD7, GD8, GD9 and GD10 were obtained from Malvastrum coromandelianum showing leaf curl symptoms in Guangdong Province of China. A specific 500 bp product was consistently detected in total DNA extracts, amplified with universal primers specific for members of the genus Begomovirus. Analysis of their partial DNA sequences revealed that they are isolates of the same begomovirus species, sharing 92·8%–97·1% nucleotide sequence identity. The complete DNA sequences of both GD6 and GD9 were found to be 2767 nucleotides, with all the characteristic features of begomovirus genome organization. The two isolates have less than 85·2% nucleotide sequence identity with other reported begomoviruses. Consequently, GD6 and GD9 are considered to be isolates of a novel begomovirus species, for which the name Malvastrum leaf curl Guangdong virus (MLCuGdV) is proposed. Sequence analyses suggest that MLCuGdV may have arisen by recombination between viruses related to Papaya leaf curl China virus , Tomato leaf curl Philippines virus and other undiscovered virus ancestors. Neither the DNA-B component nor the DNAβ molecule associated with these begomovirus isolates was found. An infectious clone of GD6 was constructed. GD6 efficiently infected Nicotiana benthamiana , N. glutinosa and Petunia hybrida by agro-inoculation, and Malvastrum coromandelianum by whitefly transmission, inducing leaf curling, vein swelling and stunting symptoms. GD6 was also infectious in N. tabacum , but did not induce observable disease symptoms. 相似文献
4.
烟粉虱内共生菌groEL基因编码一种与植物病毒传毒相关的GroEL蛋白.以B型烟粉虱为研究对象,利用1对特异引物,对B型烟粉虱体内的groEL基因进行PCR扩增,选取502 bp groEL基因片段构建dsRNA,并将其连接植物表达载体pBIN19,将重组质粒电激转化农杆菌菌株LBA4404.采用农杆菌浸染转化本氏烟草,PCR筛选表明,目的片段已整合至转基因植株的基因组DNA;RT-PCR结果表明,502 bp的groEL基因片段在转基因植株中被转录. 相似文献
5.
Monique Soro Fidèle Tiendrébéogo Justin S. Pita Edwig T. Traoré Koussao Somé Ezechiel B. Tibiri James B. Néya J. Musembi Mutuku Jacques Simporé Daouda Koné 《Plant pathology》2021,70(9):2207-2216
Surveys were conducted in 2016 and 2017 across the main cassava-growing regions of Burkina Faso to assess the status of cassava mosaic disease (CMD) and to determine the virus strains causing the disease, using field observation and phylogenetic analysis. CMD incidence varied between regions and across years but was lowest in Hauts-Bassins (6.0%, 2016 and 5.4%, 2017) and highest in Centre-Sud (18.5%, 2016) and in Boucle du Mouhoun (51.7%, 2017). The lowest CMD severity was found in Est region (2.0) for both years and the highest in Sud-Ouest region (3.3, 2016) and Centre-Sud region (2.8, 2017). The CMD infection was primarily associated with contaminated cuttings in all regions except in Hauts-Bassins, where whitefly-borne infection was higher than cuttings-borne infection in 2016. PCR screening of 687 samples coupled with sequence analysis revealed the presence of African cassava mosaic-like (ACMV-like) viruses and East African cassava mosaic-like (EACMV-like) viruses as single infections at 79.5% and 1.1%, respectively. Co-infections of ACMV-like and EACMV-like viruses were detected in 19.4% of the tested samples. In addition, 86.7% of the samples positive for EACMV-like virus were found to be positive for East African cassava mosaic Cameroon virus (EACMCMV). Phylogenetic analysis revealed the segregation of cassava mosaic geminiviruses (CMGs) from Burkina Faso into three clades specific to ACMV, African cassava mosaic Burkina Faso virus (ACMBFV), and EACMCMV, confirming the presence of these viruses. The results of this study show that EACMCMV occurrence may be more prevalent in Burkina Faso than previously thought. 相似文献
6.
云南省烟草上双生病毒的发生与分布 总被引：1，自引：0，他引：1
已报道云南省烟草曲叶病(Tobacco leaf curl disease, TLCD)由3种菜豆金色花叶病毒属(Begomovirus)的双生病毒引起。它们是烟草曲茎病毒(Tobacco curly shoot virus, TbCSV)、云南烟草曲叶病毒(Tobacco leaf curl Yunnan virus, TbLCYNV)和中国番茄黄化曲叶病毒(Tomato yellow leaf curl China virus, TYLCCNV)。为了了解这3种病毒的分布, 2000~2005年, 从云南省4个市(州)采集了109个烟草曲叶病样品, 利用3种病毒的特异引物对采集样品进行了PCR检测。从保山市的烟草曲叶病样品中检测到3种病毒, 并且存在TbCSV+TbLCYNV、TbCSV+TYLCCNV和TbCSV+TbLYNV+TYLCCNV的复合侵染, 从大理州、文山州和红河州的烟草曲叶病样品中仅检测到TYLCCNV。对39个分离物部分序列的系统进化分析结果表明, 病毒分离物依据病毒种类和地理位置聚成几簇。对烟草曲叶病的流行和病害控制策略进行了讨论。 相似文献
7.
8.
香料烟粉虱传双生病毒的分子检测 总被引：1，自引：0，他引：1
发生在保山香料烟生产区粉虱传双生病毒病,已严重影响到了香料烟的品质和产量。本研究利用PCR技术快速检测香料烟植株及田间其它植物如胜红蓟、赛葵及菜豆等、以及病毒介体的带毒情况。对部分样品的PCR检测及序列分析表明,感染香料烟双生病毒有中国番茄黄曲叶病毒、番茄黄曲叶病毒、云南烟草曲茎病毒、烟草曲茎病毒以及云南烟草曲叶病毒等,且一些样品存在复合侵染现象。本研究为掌握病害发生流行的基本规律,监控病害在香料烟上的发生流行提供了依据。 相似文献
9.
在严重发生番茄曲叶病的田间,发现主要杂草鲤肠表现出叶脉褪绿黄化、叶片皱缩或卷曲等症状,田间病株率达63%;用烟粉虱传双生病毒兼并引物对随机采集的20个鲤肠病样进行PCR检测,结果发现,从这些病样中均能扩增出1条356 bp的特异片段;室内人工接种试验结果显示,鲤肠分离物可以侵染番茄而引起曲叶症状。因此,鲤肠可能是广东番茄曲叶病毒的自然中间寄主。 相似文献
10.