STUDIES ON THE WITCHES'-BROOM VIRUS DISEASE OF POTATOES IN BRITISH COLUMBIA

1952 ◽  
Vol 30 (6) ◽  
pp. 735-742 ◽  
Author(s):  
N. S. Wright
Keyword(s):  
British Columbia ◽  
Potato Virus ◽  
Virus Disease ◽  
Cambial Activity ◽  
Potato Seedling ◽  
Disease Symptoms ◽  
Indicator Plants ◽  
Potato Varieties ◽  
Abrupt Cessation ◽  
Tree Tomato

Plants of the White Rose and Netted Gem potato varieties naturally or artificially inoculated with the witches'-broom of potato virus expressed symptoms only after the progeny of inoculated plants was grown, but symptoms occurred on the foliage of the X virus-immune potato seedling 41956 within eight weeks after grafting. Tomato and tree tomato served as indicator plants on which two apparent strains of the virus could be distinguished. The first strain caused the symptoms on tomato usually associated with the disease on this suscept, but the second strain caused a disease similar to tomato big bud. Attempts to transmit the virus by means of dodder and insects were unsuccessful. An abrupt cessation of cambial activity and consequent underdevelopment of secondary conductive tissue precede the appearance of disease symptoms on potato.

scholarly journals The effect of potato rugose on the yield of some potato varieties

1961 ◽  
Vol 33 (1) ◽  
pp. 89-100
Author(s):  
Onni Pohjakallio ◽  
Laura Karhuvaara ◽  
Simo Antila
Keyword(s):  
Virus Infection ◽  
Potato Virus ◽  
Potato Plant ◽  
Potato Virus Y ◽  
Tuber Yield ◽  
Virus Disease ◽  
Potato Varieties ◽  
Potato Plants ◽  
Severe Type

The virus disease occurring in the potato varieties Harbinger, Aquila, and King George V was probably the potato rugose caused by potato virus Y (Solanum virus 2). In the variety Harbinger, the degree of strength of the virus disease probably varied as a result of the appearance of different races of potato virus Y. The type of the virus disease did not change from one vegetative generation of the potato to another. In the potato varieties Aquila and King George V, only the severe type of the disease was observed. The severe type of the virus disease reduced the tuber yield of all the potato varieties investigated to a level of 5 to 6 %, and the slight type occurring in the variety Harbinger to an average of 27 % of the normal. The virus infection appeared more frequently in Harbinger than in the variety Aquila. In the summer, when the infection of the potato plant took place, the virus disease reduced its productivity only relatively little. In the following vegetative generation of the diseased potato plants, the degree of their degeneration conclusively displayed itself. Following this, the wakening of the virus diseased plants did not progress further from one vegetative generation to the next.

Effects of Sweet Potato Virus Disease (SPVD) on the Yield of Sweet Potato Genotypes in Cameroon

1991 ◽  
Vol 27 (2) ◽  
pp. 221-225 ◽  
Author(s):  
J. M. Ngeve ◽  
J. C. Bouwkamp
Keyword(s):  
Sweet Potato ◽  
Potato Virus ◽  
Virus Disease ◽  
Yield Reduction ◽  
Storage Roots ◽  
Potato Varieties ◽  
Severity Rating ◽  
Potato Virus Disease ◽  
Sweet Potato Virus ◽  
Sweet Potato Virus Disease

SummarySweet potato virus disease (SPVD) causes strap-shaped leaves, vein-clearing, puckering, chlorosis and stunting in susceptible sweet potato varieties and yields are much reduced. To investigate the tolerance of genotypes and obtain a better appraisal of yield loss caused by SPVD, eight sweet potato varieties showing symptoms of SPVD were studied for two years in an area where SPVD is severe. Two varieties, although showing symptoms, were tolerant of the disease; their yields were not significantly depressed by SPVD. Among the remaining six varieties, storage root fresh yields were reduced by 56–90% in plants showing SPVD symptoms. Marketable yields, as well as total and marketable numbers of storage roots were similarly depressed by SPVD in the less tolerant varieties. Significant correlations were found between disease severity rating and yield reduction among cultivars.

scholarly journals The Spread and Transmission of Sweet Potato Virus Disease (SPVD) and Its Effect on the Gene Expression Profile in Sweet Potato

Plants ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 492 ◽  
Author(s):  
Kai Zhang ◽  
Huixiang Lu ◽  
Chuanfang Wan ◽  
Daobin Tang ◽  
Yong Zhao ◽  
...  
Keyword(s):  
Sweet Potato ◽  
Potato Virus ◽  
Field Experiments ◽  
Virus Disease ◽  
Growth Stages ◽  
Storage Roots ◽  
Potato Varieties ◽  
Potato Virus Disease ◽  
Sweet Potato Virus ◽  
Sweet Potato Virus Disease

Sweet potato virus disease (SPVD) is the most devastating viral disease in sweet potato (Ipomoea batatas (L.) Lam.), causing substantial yield losses worldwide. We conducted a systemic investigation on the spread, transmission, and pathogenesis of SPVD. Field experiments conducted over two years on ten sweet potato varieties showed that SPVD symptoms first occurred in newly developed top leaves, and spread from adjacent to distant plants in the field. The SPVD incidence was mainly (but not only) determined by the resistance of the varieties planted, and each variety exhibited a characteristic subset of SPVD symptoms. SPVD was not robustly transmitted through friction inoculation, but friction of the main stem might contribute to a higher SPVD incidence rate compared to friction of the leaf and branch tissues. Furthermore, our results suggested that SPVD might be latent in the storage root. Therefore, using virus-free storage roots and cuttings, purposeful monitoring for SPVD according to variety-specific symptoms, and swiftly removing infected plants (especially during the later growth stages) would help control and prevent SPVD during sweet potato production. Comparative transcriptome analysis revealed that numerous genes involved in photosynthesis, starch and sucrose metabolism, flavonoid biosynthesis, and carotenoid biosynthesis were downregulated following SPVD, whereas those involved in monolignol biosynthesis, zeatin biosynthesis, trehalose metabolism, and linoleic acid metabolism were upregulated. Notably, critical genes involved in pathogenesis and plant defense were significantly induced or suppressed following SPVD. These data provide insights into the molecular changes of sweet potato in response to SPVD and elucidate potential SPVD pathogenesis and defense mechanisms in sweet potato. Our study provides important information that can be used to tailor sustainable SPVD control strategies and guide the molecular breeding of SPVD-resistant sweet potato varieties.

STUDIES ON RUBUS VIRUS DISEASES IN BRITISH COLUMBIA: VIII. RASPBERRY LEAF CURL

1962 ◽  
Vol 40 (5) ◽  
pp. 651-657 ◽  
Author(s):  
Richard Stace-Smith
Keyword(s):  
British Columbia ◽  
Virus Disease ◽  
Rubus Idaeus ◽  
Access Time ◽  
Black Raspberry ◽  
Red Raspberry ◽  
Experimental Conditions ◽  
Indicator Plants ◽  
Leaf Curl Virus ◽  
Leaf Curl

A virus disease that occurs on red raspberry in the Okanagan Valley in British Columbia was identified as raspberry leaf curl. Under experimental conditions the virus was transmitted by the aphid Aphis idaci V. d.G. Test plants included red raspberry, Rubus idaeus L.; black raspberry, Rubus occidentalis L.; wineberry, Rubus phoenicolasius Maxim.; Rubus henryi Hemsl. & Kuntse; and the Alpine strawberry, Fragaria vesca L. The virus did not infect black raspberry and caused only transitory symptoms on Alpine strawberry. Root cuttings of red raspberry, leaf-bud cuttings of R. henryi, and seedlings of wineberry provided satisfactory indicator plants. Wineberry and R. henryi were more readily inoculated by aphids than red raspberry. Non-viruliferous aphids required a feed of at least 1 day on the virus source to acquire an infective charge. When viruliferous aphids were transferred to a series of healthy indicator plants, some plants became infected after a test access time of 20 minutes, although transmissions were increased if the time was increased to 1 hour. The virus was found to persist in viruliferous aphids for at least 11 days. Leaf curl virus was not eliminated from infected plants held at an air temperature of 37 °C for periods up to 4 weeks.

APHID DISSEMINATION OF STRAWBERRY VIRUSES IN NOVA SCOTIA

1964 ◽  
Vol 44 (3) ◽  
pp. 235-239 ◽  
Author(s):  
D. L. Craig ◽  
H. T. Stultz
Keyword(s):  
Nova Scotia ◽  
Myzus Persicae ◽  
Dominant Species ◽  
Virus Disease ◽  
Mottle Virus ◽  
Fragaria Vesca ◽  
Disease Symptoms ◽  
Indicator Plants ◽  
Aulacorthum Solani

In Nova Scotia, strawberry virus disease symptoms appeared in 12% of the Fragaria vesca L. (EMC) plants present in faunal study plots planted in 1961 and in 14% in plots planted in 1962.Latent-C virus and mottle virus were the dominant diseases and were present in approximately equal numbers of the indicator plants. A smaller number of indicator planes were dwarfed but otherwise free of symptoms associated with previously described virus diseases.Known vectors present in the plots included Rhodobium porosum (Sanderson), Myzus persicae (Sulz.), Aulacorthum solani (Kalt.), Amphorophura rubi (Kalt.), and Pentatrichopus minor (Forbes). R. porosum was the dominant species.

Expression of the Tomato pot-1 Gene Confers Potato Virus Y (PVY) Resistance in Susceptible Potato Varieties

2021 ◽  
Author(s):  
Chen Zhang ◽  
Kelly A. Zarka ◽  
Daniel G. Zarka ◽  
Jonathan L. Whitworth ◽  
David S. Douches
Keyword(s):  
Potato Virus ◽  
Potato Virus Y ◽  
Potato Varieties ◽  
Pvy Resistance

Control strategies for sweet potato virus disease in Africa

2004 ◽  
Vol 100 (1) ◽  
pp. 115-122 ◽  
Author(s):  
Richard W. Gibson ◽  
Valentine Aritua ◽  
Emmanuel Byamukama ◽  
Isaac Mpembe ◽  
James Kayongo
Keyword(s):  
Sweet Potato ◽  
Potato Virus ◽  
Virus Disease ◽  
Control Strategies ◽  
Potato Virus Disease ◽  
Sweet Potato Virus ◽  
Sweet Potato Virus Disease

scholarly journals Lettuce Chlorosis Virus Disease: A New Threat to Cannabis Production

Viruses ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 802 ◽  
Author(s):  
Hadad ◽  
Luria ◽  
Smith ◽  
Sela ◽  
Lachman ◽  
...  
Keyword(s):  
Cannabis Sativa ◽  
Virus Disease ◽  
Middle Eastern ◽  
Sequencing Analysis ◽  
Disease Symptoms ◽  
Next Generation Sequencing Analysis ◽  
Nutrition Deprivation ◽  
Rapid Amplification ◽  
Race Pcr ◽  
Complete Viral Genome

In a survey conducted in Cannabis sativa L. (cannabis) authorized farms in Israel, plants showed disease symptoms characteristic of nutrition deprivation. Interveinal chlorosis, brittleness, and occasional necrosis were observed in older leaves. Next generation sequencing analysis of RNA extracted from symptomatic leaves revealed the presence of lettuce chlorosis virus (LCV), a crinivirus that belongs to the Closteroviridae family. The complete viral genome sequence was obtained using RT-PCR and Rapid Amplification of cDNA Ends (RACE) PCR followed by Sanger sequencing. The two LCV RNA genome segments shared 85–99% nucleotide sequence identity with LCV isolates from GenBank database. The whitefly Bemisia tabaci Middle Eastern Asia Minor1 (MEAM1) biotype transmitted the disease from symptomatic cannabis plants to un-infected ‘healthy’ cannabis, Lactuca sativa, and Catharanthus roseus plants. Shoots from symptomatic cannabis plants, used for plant propagation, constituted a primary inoculum of the disease. To the best of our knowledge, this is the first report of cannabis plant disease caused by LCV.

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