Yellows
Mostrando 13-24 de 61 artigos, teses e dissertações.
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13. Virus do amarelecimento foliar da cana-de-açucar : caracterização e estudo comparativo entre variedades com diferentes respostas a infecção viral
A Síndrome do Amarelecimento Foliar da Cana-de-Açúcar é atualmente uma das principais preocupações da cultura canavieira no Brasil e em todos os países produtores desta gramínea. Em função da importância deste problema, muitos estudos foram realizados na tentativa de se descobrir o agente causal desta síndrome, originando controvérsias sobre a s
Publicado em: 2003
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14. Genetic Interrelatedness among Clover Proliferation Mycoplasmalike Organisms (MLOs) and Other MLOs Investigated by Nucleic Acid Hybridization and Restriction Fragment Length Polymorphism Analyses
DNA was isolated from clover proliferation (CP) mycoplasmalike organism (MLO)-diseased periwinkle plants (Catharanthus roseus (L.) G. Don.) and cloned into pSP6 plasmid vectors. CP MLO-specific recombinant DNA clones were biotin labeled and used as probes in dot hybridization and restriction fragment length polymorphism analyses to study the genetic interrel
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15. Beet western yellows virus-associated RNA: an independently replicating RNA that stimulates virus accumulation.
Infections of plants by subviral RNA agents, alone or in association with virus genomic RNA molecules, are well known. The ST9 strain of beet western yellows virus encapsidates not only the 5.6-kilobase genomic RNA that is typical of luteoviruses, but also a 2.8-kilobase-associated RNA that has a distinct nucleotide sequence. The ST9-associated RNA has been
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16. Nonradioactive Screening Method for Isolation of Disease-Specific Probes To Diagnose Plant Diseases Caused by Mycoplasmalike Organisms
DNA fragments of tomato big bud (BB) mycoplasmalike organism (MLO) in diseased periwinkle plants (Catharanthus roseus L.) were cloned to pSP6 plasmid vectors and amplified in Escherichia coli JM83. A nonradioactive method was developed and used to screen for MLO-specific recombinants. Cloned DNA probes were prepared by nick translation of the MLO recombinant
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17. Agroinfection as an alternative to insects for infecting plants with beet western yellows luteovirus.
Beet western yellows luteovirus, like other luteoviruses, cannot be transmitted to host plants by mechanical inoculation but requires an aphid vector, a feature that has heretofore presented a serious obstacle to the study of such viruses. In this paper we describe use of agroinfection to infect hosts with beet western yellows virus without recourse to aphid
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18. Identification and characterization of plasmids from the western aster yellows mycoplasmalike organism.
Supercoiled double-stranded DNA molecules (plasmids) were isolated from plants infected with three laboratory strains of western aster yellows mycoplasma-like organism (AY-MLO) by using cesium chloride-ethidium bromide density gradients. Southern blot analysis, using plasmids from the severe strain of AY-MLO (SAY-MLO) as the probe, identified at least four p
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19. An Explanation for the Difference in Photosynthetic Capabilities of Healthy and Beet Yellows Virus-infected Sugar Beets (Beta vulgaris L.) 1
Sugar beets (Beta vulgaris L.) infected with the Beet Yellows Virus exhibit lower rates of net photosynthesis at light saturation than do healthy plants. These Pn reductions were correlated with increases in leaf resistance to water vapor loss. Theoretical analyses demonstrated that, although the leaf resistance to water vapor loss increases could account fo
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20. Contrasting Effects of Selection on Sequence Diversity and Linkage Disequilibrium at Two Phytoene Synthase LociW⃞
We investigated the effects of human selection for yellow endosperm color, representing increased carotenoid content, on two maize genes, the Y1 phytoene synthase and PSY2, a putative second phytoene synthase. Multiple polymorphic sites were identified at Y1 and PSY2 in 75 white and yellow maize inbred lines. Many polymorphic sites showed strong association
American Society of Plant Biologists.
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21. Aphid transmission of beet western yellows luteovirus requires the minor capsid read-through protein P74.
Beet western yellows luteovirus is obligately transmitted by the aphid Myzus persicae in a circulative, non-propagative fashion. Virus movement across the epithelial cells of the digestive tube into the hemocoel and from the hemocoel into the accessory salivary glands is believed to occur by receptor-mediated endocytosis and exocytosis. Virions contain two t
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22. Evidence on Possible Mycoplasma Etiology of Aster Yellows Disease I. Suppression of Symptom Development in Plants by Antibiotics
Antibiotics suppressed development of aster yellows (AY) disease symptoms in plants of china aster [Callistephus chinensis (L.) Nees.] and annual chrysanthemum (Chrysanthemum carinatum, Schousb.). When inoculated chrysanthemum plants were treated by any of several techniques with tetracycline antibiotics or chloramphenicol, symptoms failed to appear during t
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23. Evidence on Possible Mycoplasma Etiology of Aster Yellows Disease II. Suppression of Aster Yellows in Insect Vectors
Chlortetracycline or chloramphenicol (but not kanamycin, penicillin, or erythromycin), when administered in hydroponic solution to diseased aster, reduced the availability of the aster yellows (AY) agent to nymphs of Macrosteles fascifrons (Stål). Insects exposed to healthy plants whose roots were immersed in chlortetracycline were able to acquire AY agent
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24. Leader Proteinase of the Beet Yellows Closterovirus: Mutation Analysis of the Function in Genome Amplification
The beet yellows closterovirus leader proteinase (L-Pro) possesses a C-terminal proteinase domain and a nonproteolytic N-terminal domain. It was found that although L-Pro is not essential for basal-level replication, deletion of its N-terminal domain resulted in a 1,000-fold reduction in RNA accumulation. Mutagenic analysis of the N-terminal domain revealed
American Society for Microbiology.