Being a major class of single-stranded DNA viruses, geminiviruses are mostly studied due to their catastrophic infectious effect on crops. These DNA viruses are characteristic for their ability in quickly multiplying ...Being a major class of single-stranded DNA viruses, geminiviruses are mostly studied due to their catastrophic infectious effect on crops. These DNA viruses are characteristic for their ability in quickly multiplying viral genetic materials without integrating into the genome of plants, which makes them ideal for developing viral vectors for plants bioengineering. Geminivirus-derived vectors can be classified into expression vectors and virus-induced gene silencing（VIGS） vectors. Details of the design, construction, application and improvements of these geminivirus vectors are summarized and discussed.展开更多
Jasmonates(JAs) are phytohormones that finely regulate critical biological processes, including plant development and defense. JASMONATE ZIM-DOMAIN(JAZ) proteins are crucial transcriptional regulators that keep JA-res...Jasmonates(JAs) are phytohormones that finely regulate critical biological processes, including plant development and defense. JASMONATE ZIM-DOMAIN(JAZ) proteins are crucial transcriptional regulators that keep JA-responsive genes in a repressed state. In the presence of JA-Ile, JAZ repressors are ubiquitinated and targeted for degradation by the ubiquitin/proteasome system,allowing the activation of downstream transcription factors and, consequently, the induction of JA-responsive genes. A growing body of evidence has shown that JA signaling is crucial in defending against plant viruses and their insect vectors. Here, we describe the interaction of C2proteins from two tomato-infecting geminiviruses from the genus Begomovirus, tomato yellow leaf curl virus(TYLCV) and tomato yellow curl Sardinia virus(TYLCSaV), with the transcriptional repressor JAZ8 from Arabidopsis thaliana and its closest orthologue in tomato, SlJAZ9. Both JAZ and C2proteins colocalize in the nucleus, forming discrete nuclear speckles. Overexpression of JAZ8did not lead to altered responses to TYLCV infection in Arabidopsis;however, knock-down of JAZ8 favors geminiviral infection. Low levels of JAZ8 likely affect the viral infection specifically,since JAZ8-silenced plants neither display obvious developmental phenotypes nor present differences in their interaction with the viral insect vector. In summary, our results show that the geminivirus-encoded C2 interacts with JAZ8 in the nucleus, and suggest that this plant protein exerts an anti-geminiviral effect.展开更多
Three virus-infected Carica papaya samples showing mosaic,leaf roll symptoms and three virus-infected Hibiscus rosa-sinensis samples showing chlorosis and distortion symptoms were collected in Danzhou of Hainan Provin...Three virus-infected Carica papaya samples showing mosaic,leaf roll symptoms and three virus-infected Hibiscus rosa-sinensis samples showing chlorosis and distortion symptoms were collected in Danzhou of Hainan Province.A pair of degenerate primers was designed according to the conserved sequence of CP gene and intergenic spacer of Whitefly-transmittal geminiviruses(WTGV),PCR product of expected size was amplified from six samples.The specific fragments were cloned and sequenced,and sequence analysis showed that PCR product had a geminiviral gene origin,which was demonstrated by BLAST.Partial DNA-A between P1 and H2 shared only 66% nucleotide sequence identity.Polygenie analysis with DNA-A of P1 and H2 from other 16 WTG,P1 was most closely related to LAYVV,H2 differed from those of other geminiviruses and constitute a new evolutionary branch.展开更多
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...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.展开更多
Using DNA of Chinese Tobacco Leaf Curl Virus Guangxi(TbLCV Guangxi)as the template,a 0.4 kb virus specific fragment induding the total common region of the virus and DNA sequence of 52 aa of N terminal of AV1 was obta...Using DNA of Chinese Tobacco Leaf Curl Virus Guangxi(TbLCV Guangxi)as the template,a 0.4 kb virus specific fragment induding the total common region of the virus and DNA sequence of 52 aa of N terminal of AV1 was obtained by PCR with primers specific to whitefly transmittal gemniviruses,cloned and sequenced.This fragment can basically represent the characteristics of the virus full length genome.The sequence of this fragment is the same as that of chinese tomato yellow leaf curl virus (TYLCV Chi), which indicates that TbLCV Guangxi and TYLCV Chi are the same gemniviruses. According to the sequence of the common region of the 0.4 kb fragment, the virus full length genome DNA was amplified from the infected tobacco plant by PCR with primers back to back.展开更多
基金supported by the National Natural Science Foundation of China (31672006 and 31390422)
文摘Being a major class of single-stranded DNA viruses, geminiviruses are mostly studied due to their catastrophic infectious effect on crops. These DNA viruses are characteristic for their ability in quickly multiplying viral genetic materials without integrating into the genome of plants, which makes them ideal for developing viral vectors for plants bioengineering. Geminivirus-derived vectors can be classified into expression vectors and virus-induced gene silencing（VIGS） vectors. Details of the design, construction, application and improvements of these geminivirus vectors are summarized and discussed.
基金supported by a President's International Fellowship Initiative (PIFI) postdoctoral fel owship (No. 2016PB042) from the Chinese Academy of Sciencesthe “Programa Juan de la Cierva” (IJCI-2017-33367) from the MCIN and FEDER program UMA20-FEDERJA-132 by AEI and by “ERDF A way of making Europe,” by the “European Union”Funding for Open Access charge: Universidad de Málaga / CBUA。
文摘Jasmonates(JAs) are phytohormones that finely regulate critical biological processes, including plant development and defense. JASMONATE ZIM-DOMAIN(JAZ) proteins are crucial transcriptional regulators that keep JA-responsive genes in a repressed state. In the presence of JA-Ile, JAZ repressors are ubiquitinated and targeted for degradation by the ubiquitin/proteasome system,allowing the activation of downstream transcription factors and, consequently, the induction of JA-responsive genes. A growing body of evidence has shown that JA signaling is crucial in defending against plant viruses and their insect vectors. Here, we describe the interaction of C2proteins from two tomato-infecting geminiviruses from the genus Begomovirus, tomato yellow leaf curl virus(TYLCV) and tomato yellow curl Sardinia virus(TYLCSaV), with the transcriptional repressor JAZ8 from Arabidopsis thaliana and its closest orthologue in tomato, SlJAZ9. Both JAZ and C2proteins colocalize in the nucleus, forming discrete nuclear speckles. Overexpression of JAZ8did not lead to altered responses to TYLCV infection in Arabidopsis;however, knock-down of JAZ8 favors geminiviral infection. Low levels of JAZ8 likely affect the viral infection specifically,since JAZ8-silenced plants neither display obvious developmental phenotypes nor present differences in their interaction with the viral insect vector. In summary, our results show that the geminivirus-encoded C2 interacts with JAZ8 in the nucleus, and suggest that this plant protein exerts an anti-geminiviral effect.
文摘Three virus-infected Carica papaya samples showing mosaic,leaf roll symptoms and three virus-infected Hibiscus rosa-sinensis samples showing chlorosis and distortion symptoms were collected in Danzhou of Hainan Province.A pair of degenerate primers was designed according to the conserved sequence of CP gene and intergenic spacer of Whitefly-transmittal geminiviruses(WTGV),PCR product of expected size was amplified from six samples.The specific fragments were cloned and sequenced,and sequence analysis showed that PCR product had a geminiviral gene origin,which was demonstrated by BLAST.Partial DNA-A between P1 and H2 shared only 66% nucleotide sequence identity.Polygenie analysis with DNA-A of P1 and H2 from other 16 WTG,P1 was most closely related to LAYVV,H2 differed from those of other geminiviruses and constitute a new evolutionary branch.
文摘烟粉虱内共生菌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.
文摘Using DNA of Chinese Tobacco Leaf Curl Virus Guangxi(TbLCV Guangxi)as the template,a 0.4 kb virus specific fragment induding the total common region of the virus and DNA sequence of 52 aa of N terminal of AV1 was obtained by PCR with primers specific to whitefly transmittal gemniviruses,cloned and sequenced.This fragment can basically represent the characteristics of the virus full length genome.The sequence of this fragment is the same as that of chinese tomato yellow leaf curl virus (TYLCV Chi), which indicates that TbLCV Guangxi and TYLCV Chi are the same gemniviruses. According to the sequence of the common region of the 0.4 kb fragment, the virus full length genome DNA was amplified from the infected tobacco plant by PCR with primers back to back.
