scholarly journals The early days of late blight

eLife ◽  
2013 ◽  
Vol 2 ◽  
Author(s):  
Paul RJ Birch ◽  
David EL Cooke
Keyword(s):  
Late Blight ◽  
Dna Sequencing ◽  
Phytophthora Infestans ◽  
19Th Century ◽  
Large Scale ◽  
Clonal Lineage ◽  
The 19Th Century

Large-scale DNA sequencing of samples of foliage collected in the 19th century from plants infected with late blight has shown that the potato famines of the 1840s were triggered by a single clonal lineage of Phytophthora infestans, called HERB-1, which persisted for at least 50 years.

scholarly journals PEREDARAN OPIUM DI MINANGKABAU ABAD KE-19

2020 ◽  
Vol 10 (2) ◽  
Author(s):  
Muhammad Nasir
Keyword(s):  
19Th Century ◽  
Large Scale ◽  
Reform Movement ◽  
Religious Groups ◽  
Opium Trade ◽  
Islamic Reform ◽  
History Of ◽  
The 19Th Century ◽  
Made In

This article discusses the history of Minangkabau in the 19th century AD. One of the themes of 19th century Minangkabau history is the Islamic reform movement promoted by religious groups commonly called the Padri movement. One of the central issues of the Padri movement was eradicating the habit of drinking alcoholism that occurred in Minangkabau society. The habit of smoking the drug that comes from boiling opium certainly indicates the existence of the drug on a large scale. Therefore, this article will present a picture of the opium trade in Minangkabau in the 19th century from upstream (providers) to downstream (dealers). It is hoped that this article will be useful as an explanation for the habit of smoking made in the Minangkabau community at that time.

Extinction

2018 ◽  
Author(s):  
Mark V. Barrow
Keyword(s):  
Endangered Species ◽  
19Th Century ◽  
Large Scale ◽  
Wildlife Conservation ◽  
Captive Breeding ◽  
18Th Century ◽  
Apex Predators ◽  
Biodiversity Crisis ◽  
Extinction Events ◽  
The 19Th Century

The prospect of extinction, the complete loss of a species or other group of organisms, has long provoked strong responses. Until the turn of the 18th century, deeply held and widely shared beliefs about the order of nature led to a firm rejection of the possibility that species could entirely vanish. During the 19th century, however, resistance to the idea of extinction gave way to widespread acceptance following the discovery of the fossil remains of numerous previously unknown forms and direct experience with contemporary human-driven decline and the destruction of several species. In an effort to stem continued loss, at the turn of the 19th century, naturalists, conservationists, and sportsmen developed arguments for preventing extinction, created wildlife conservation organizations, lobbied for early protective laws and treaties, pushed for the first government-sponsored parks and refuges, and experimented with captive breeding. In the first half of the 20th century, scientists began systematically gathering more data about the problem through global inventories of endangered species and the first life-history and ecological studies of those species. The second half of the 20th and the beginning of the 21st centuries have been characterized both by accelerating threats to the world’s biota and greater attention to the problem of extinction. Powerful new laws, like the U.S. Endangered Species Act of 1973, have been enacted and numerous international agreements negotiated in an attempt to address the issue. Despite considerable effort, scientists remain fearful that the current rate of species loss is similar to that experienced during the five great mass extinction events identified in the fossil record, leading to declarations that the world is facing a biodiversity crisis. Responding to this crisis, often referred to as the sixth extinction, scientists have launched a new interdisciplinary, mission-oriented discipline, conservation biology, that seeks not just to understand but also to reverse biota loss. Scientists and conservationists have also developed controversial new approaches to the growing problem of extinction: rewilding, which involves establishing expansive core reserves that are connected with migratory corridors and that include populations of apex predators, and de-extinction, which uses genetic engineering techniques in a bid to resurrect lost species. Even with the development of new knowledge and new tools that seek to reverse large-scale species decline, a new and particularly imposing danger, climate change, looms on the horizon, threatening to undermine those efforts.

scholarly journals The Genus Phytophthora Anno 2012

2012 ◽  
Vol 102 (4) ◽  
pp. 348-364 ◽  
Author(s):  
Laurens P. N. M. Kroon ◽  
Henk Brouwer ◽  
Arthur W. A. M. de Cock ◽  
Francine Govers
Keyword(s):  
New Species ◽  
Late Blight ◽  
19Th Century ◽  
Phytophthora Species ◽  
Plant Diseases ◽  
Natural Ecosystems ◽  
Monthly Basis ◽  
Irish Famine ◽  
Great Irish Famine ◽  
The 19Th Century

Plant diseases caused by Phytophthora species will remain an ever increasing threat to agriculture and natural ecosystems. Phytophthora literally means plant destroyer, a name coined in the 19th century by Anton de Bary when he investigated the potato disease that set the stage for the Great Irish Famine. Phytophthora infestans, the causal agent of potato late blight, was the first species in a genus that at present has over 100 recognized members. In the last decade, the number of recognized Phytophthora species has nearly doubled and new species are added almost on a monthly basis. Here we present an overview of the 10 clades that are currently distinguished within the genus Phytophthora with special emphasis on new species that have been described since 1996 when Erwin and Ribeiro published the valuable monograph ‘Phytophthora diseases worldwide’ (35).

scholarly journals Late Blight Caused by Phytophthora infestans on Solanum sarrachoides in Northeastern Maine

Plant Disease ◽  
2005 ◽  
Vol 89 (4) ◽  
pp. 435-435 ◽  
Author(s):  
K. L. Deahl ◽  
R. Jones ◽  
L. A. Wanner ◽  
A. Plant
Keyword(s):  
Late Blight ◽  
Phytophthora Infestans ◽  
Morphological Characteristics ◽  
Dna Fingerprint ◽  
Penicillin G ◽  
Mitochondrial Haplotype ◽  
Clonal Lineage ◽  
Growth Responses ◽  
Hairy Nightshade ◽  
Solanum Sarrachoides

The area bordering three 110-ha (270-acre) fields of blighted potatoes (Solanum tuberosum L.) in three northeastern Maine locations was surveyed during the summer of 2004 for the occurrence of late blight on cultivated and noncultivated host plants. Special attention was directed to solanaceous weed species. Hundreds of Solanum sarrachoides Sendt. ex. Mart. (hairy nightshade) plants with numerous leaf lesions and moderate defoliation were seen. The frequency of blighted hairy nightshade approximated the frequency of late blight in the adjoining potato fields. Lesions typically contained extensive, white, superficial mycelia colonizing the abaxial and adaxial leaf surfaces. Samples placed in a moist chamber produced lemon-shaped sporangia. On the basis of morphological characteristics, the pathogen was tentatively identified as Phytophthora infestans (Mont.) de Bary. Isolates were obtained by surface-disinfecting leaf sections collected from two locations for 2 to 3 min in 0.5% NaOCl and placing the sections on rye grain medium amended with antibiotics (100 ppm each of penicillin G, pimaricin, and polymyxin). P. infestans was confirmed after reisolating onto rye-lima bean medium. Pathogenicity was tested on detached potato, tomato, and hairy nightshade leaves; the undersides of all leaflets from replicate plants were inoculated with droplets of swimming zoospores (≥500 zoospores per droplet), the leaves were kept at 17°C and 100% humidity, and the extent of sporulation was evaluated after 4, 6, and 7 days. With eight isolates obtained from S. sarrachoides, Koch's postulates were completed on potato and hairy nightshade. Radial growth responses of these strains on rye grain agar amended with 1, 10, or 100 μg per ml of metalaxyl (Ridomil 2E) yielded 50% effective dose values greater than 100 μg per ml, since percentage growth at the highest fungicide concentration exceeded 50% of the no metalaxyl control. These resistance levels are typical of the metalaxyl-insensitive strains of P. infestans isolated from potatoes in this area in recent years, which were previously found to correlate with metalaxyl resistance in bioassays using potato tissues (1). Eight single-sporangial isolates were homozygous for glucose-6-phosphate isomerase and peptidase (Gpi 100/111/122, Pep 100/100). All eight were A2-mating type and mitochondrial haplotype Ia, characteristics common to the US-8 clonal lineage of P. infestans from potato (2), which may infect a wider host range than the old US-1 clonal lineage. When evaluated on differential hosts, three isolates were tomato race PH-1 and complex potato race R 0,1,2,3,4,9,11. DNA fingerprint analysis with probe RG57 further established that the eight hairy nightshade isolates were identical to each other and to local P. infestans isolates from potato. To our knowledge, this is the first report of infection of S. sarrachoides by P. infestans in Maine. The pathogen was previously isolated from this host during field surveys in southern California in the 1980s in connection with late blight of tomato (4). Hairy nightshade has been shown to be a host for US-1, US-8, and US-11 isolates of P. infestans in a laboratory setting (3). The epidemiological significance of S. sarrachoides as an alternative or overwintering host of P. infestans is currently being assessed. References: (1) K. L. Deahl et al. Am. Potato J. 70:779, 1993. (2) S. B. Goodwin et al. Phytopathology 88:939, 1998. (3) H. W. Platt. Can. J. Plant Pathol. 21:301, 1999. (4) V. G. Vartanian and R. M. Endo Plant Dis. 69:516, 1985.

scholarly journals Reindeer pastoralism in Sweden 1550-1950

Rangifer ◽  
2007 ◽  
Vol 27 (3) ◽  
pp. 9 ◽  
Author(s):  
Lennart Lundmark
Keyword(s):  
19Th Century ◽  
Large Scale ◽  
18Th Century ◽  
State Intervention ◽  
16Th Century ◽  
Detailed Knowledge ◽  
Reindeer Herding ◽  
The North ◽  
Starting Point ◽  
The 19Th Century

In the middle of the 16th century we get the first opportunity to a more detailed knowledge of reindeerpastoralism in Sweden. At that time the Sami lived in a hunter-gatherer economy. A family had in average about 10-20 domesticated reindeer, mainly used for transport. They could also be milked and used as decoys when hunting wild reindeer. During late 16th century the Swedish state and merchants bought large amounts of fur from the Sami. The common payment was butter and flour. This created a new prosperity, which lead to a considerable increase in population in Swedish Lapland. The population became too large for a hunter-gatherer economy. A crisis in early 17th century was the starting point for the transition to a large-scale nomadic reindeer pastoralism. Up to the middle of the 18th century intensive reindeer pastoralism was successful. But the pastoralism became gradually too intensive and diseases started to spread when the herds were kept too densely crowded for milking in summertime. During the first decades of the 19th century reindeer pastoralism in Sweden went through a major crisis. The number of reindeer herding mountain-Sami decreased considerably, mainly because they went to live permanently along the Norwegian coastline. Intensive reindeer pastoralism started to give way for extensive herding towards the end of the 19th century. In the north of Sweden influences from the Kautokeino Sami were an important factor, in the south extensive reindeer herding started to expand when the market for meat came closer to the Sami. During the 1920s the milking of reindeer ceased in Sweden, except in a few families. At that time Sami families from the north had been removed southwards. They further demonstrated the superiority of extensive herding to the Sami in mid- and southern Lapland. Reindeer pastoralism is basically a system of interaction between man and animal, but it has been heavily influenced by market forces and state intervention during hundreds of years. To a large extent these long-term external influences have made reindeer pastoralism what it is today. That aspect should not be overlooked when assessing the future prospects of reindeer pastoralism in Scandinavia.Renskötseln i Sverige 1550-1950Abstract in Swedish / Sammanfattning: Först vid mitten av 1500-talet finns det källmaterial som ger oss en tämligen detaljerad bild av renskötseln i Sverige. Vid den tiden levde samerna i en jakt- , fiske- och samlarekonomi. En familj hade normalt 10-20 renar som främst utnyttjades vid transporter. Tamrenarna kunde också mjölkas och fungera som lockdjur vid vildrensjakt. Under senare delen av 1500-talet köpte svenska staten och handelsmän stora mängder pälsverk av samerna. Den vanligaste betalningen var smör och mjöl. Detta skapade ett välstånd som ledde till en betydande folkökning i svenska lappmarken. Befolkningen blev för stor för att rymmas inom ramarna för en jaktochfiskeekonomi. En kris i början av 1600-talet blev startpunkten för övergången till en storskalig rennomadism.Fram till mitten av 1700-talet var den intensiva renskötseln framgångsrik. Men renskötseln blev efterhand alltför intensiv. Under senare delen av 1700-talet började det spridas sjukdomar i de tätt sammanhållna hjordarna. De första decennierna av 1800-talet innebar en allvarlig kris i renskötseln. Antalet renskötande fjällsamer minskade kraftigt, främst genom utvandring till norska kusten. Den intensiva renskötseln med mjölkning av renarna började ersättas av en extensiv renskötsel inriktad på köttproduktion de sista decennierna av 1800-talet. I norr var naturförhållandena och influenser från Kautokeino-samerna en viktig faktor, i söder utvecklades renskötseln i extensiv riktning främst därför att marknaden för renkött kom närmare renskötarna. Under 1920-talet upphörde mjölkningen av renar i Sverige, utom i några enstaka familjer. Då hade förflyttningarna av samer från nordligaste Sverige söderut påskyndat utvecklingen och ytterligare markerat den extensiva renskötselteknikensöverlägsenhet. Tamrenskötsel är ett samspel mellan människa och djur, men det är inte bara en fråga om renskötaren och hans hjord. Externa marknadsfaktorer, beskattning och lagstiftning har haft ett betydandeinflytande på renskötselns utveckling under hundratals år. De har till stor del format renskötseln till vad den är idag. Detta bör beaktas när man gör bedömningar av renskötselns framtid. 

scholarly journals Did a novel virus contribute to late blight epidemics?

2018 ◽  
Author(s):  
Guohong Cai ◽  
Kevin Myers ◽  
William E. Fry ◽  
Bradley I. Hillman
Keyword(s):  
North America ◽  
Late Blight ◽  
Phytophthora Infestans ◽  
Molecular Mechanisms ◽  
Rna Virus ◽  
Causal Agent ◽  
Clonal Lineage ◽  
Significant Similarity ◽  
Tomato Production ◽  
The Us

AbstractPhytophthora infestansis the causal agent of potato and tomato late blight. In this study, we characterized a novel RNA virus, Phytophthora infestans RNA virus 2 (PiRV-2). The PiRV-2 genome is 11,170 nt and lacks a polyA tail. It contains a single large open reading frame (ORF) with short 5’- and 3’-untranslated regions. The ORF is predicted to encode a polyprotein of 3710 aa (calculated molecular weight 410.94 kDa). This virus lacks significant similarity to any other known viruses, even in the conserved RNA-dependent RNA polymerase region. Comparing isogenic strains with or without the virus demonstrated that the virus stimulated sporangia production inP. infestansand appeared to enhance its virulence. Transcriptome analysis revealed that it achieved sporulation stimulation likely through down-regulation of ammonium and amino acid intake inP. infestans. This virus was faithfully transmitted through asexual reproduction. Survey of PiRV-2 presence in aP. infestanscollection found it in most strains in the US-8 lineage, a very successful clonal lineage ofP. infestansin North America. We suggest that PiRV-2 may have contributed to its success, raising the intriguing possibility that a potentially hypervirulent virus may contribute to late blight epidemics.Author SummaryPotato late blight, the notorious plant disease behind the Irish Potato Famine, continues to pose a serious threat to potato and tomato production worldwide. While most studies on late blight epidemics focuses on pathogen virulence, host resistance, environmental factors and fungicide resistance, we present evidence in this study that a virus infecting the causal agent,Phytophthora infestans, may have played a role. We characterized a novel RNA virus, Phytophthora infestans RNA virus 2 (PiRV-2) and examined its effects on its host. By comparing identicalP. infestansstrains except with or without the virus, we found that PiRV-2 stimulated sporulation ofP. infestans(a critical factor in late blight epidemics) and increased its virulence. We also profiled gene expression in these strains and identified potential molecular mechanisms through which PiRV-2 asserted its sporulation stimulation effect. In a survey of PiRV-2 presence in aP. infestanscollection, we found PiRV-2 in most isolates of the US-8 clonal lineage, a very successfull ineage that dominated potato fields in North America for several decades. We suggest that PiRV-2 may have contributed to its success. Our findings raise the intriguing possibility that a potentially hypervirulent virus may contribute to late blight epidemics.

scholarly journals Large-scale drivers of Australian east coast cyclones since 1851

2016 ◽  
Vol 66 (2) ◽  
pp. 125
Author(s):  
Stuart A. Browning ◽  
Ian D. Goodwin
Keyword(s):  
19Th Century ◽  
Ocean Circulation ◽  
Large Scale ◽  
East Coast ◽  
Early Years ◽  
Winter Period ◽  
Storm Activity ◽  
Data Scarcity ◽  
Tasman Sea ◽  
The 19Th Century

Subtropical maritime low-pressure systems are one of the most complex and destructive storm types to impact Australia’s eastern seaboard. This family of storms, commonly referred to as East Coast Cyclones (ECC), is most active during the late autumn and early winter period when baroclinicity increases in the Tasman Sea region. ECC have proven challenging to forecast at both event and seasonal timescales. Storm activity datasets, objectively determined from reanalyses using cyclone detection algorithms, have improved understanding of the drivers of ECC over the era of satellite data coverage. In this study we attempt to extend these datasets back to 1851 using the Twentieth Century Reanalysis version 2c (20CRv2c). However, uncertainty in the 20CRv2c increases back through time due to observational data scarcity, and individual cyclones counts tend to be underestimated during the 19th century. An alternative approach is explored whereby storm activity is estimated from seasonal atmosphere-ocean circulation patterns. Seasonal ECC frequency over the 1955 to 2014 period is significantly correlated to regional sea-level pressure and sea surface temperature (SST) patterns. These patterns are used to downscale the 20CRv2c during early years when individual events are not well simulated. The stormiest periods since 1851 appear to have been 1870 to the early 1890s, and 1950 to the early 1970s. Total storm activity has been below the long-term average for most winters since 1976. Conditions conducive to frequent ECC events tend to occur during periods of relatively warm SST in the southwest Pacific typical of negative Interdecadal Pacific Oscillation (IPO-ve). Extratropical cyclogenesis is associated with negative Southern Annular Mode (SAM-ve) and blocking in the southern Tasman Sea. Subtropical cyclogenesis is associated with SAM+ve and blocking in the central Tasman Sea. While the downscaling approach shows some skill at estimating seasonal storm activity from the large-scale circulation, it cannot overcome data scarcity based uncertainties in the 19th century when the 20CRv2c is effectively unconstrained throughout most of the southern hemisphere. Storm frequency estimates during the 19th century are difficult to verify and should be interpreted cautiously and with reference to available documentary evidence.

Hans Memling

2015 ◽  
Author(s):  
Mitzi Kirkland-Ives
Keyword(s):  
20Th Century ◽  
19Th Century ◽  
Large Scale ◽  
Strong Influence ◽  
Northern Europe ◽  
High Profile ◽  
15Th Century ◽  
Italian Art ◽  
Second Tier ◽  
The 19Th Century

Hans Memling (b. c. 1440–d. 1494) was a German-born painter active in Bruges, Belgium, from 1465 to his death in 1494. Over the thirty years of his known activity Memling was one of the most successful painters in Bruges, producing works ranging from small devotional panels and individual portraits to large-scale retables for both a local and an international clientele. Memling was especially popular among the communities of foreign merchants and bankers present in Bruges, then among the most important mercantile centers of northern Europe. Memling was respected as one of the best-known northern artists internationally after his death, and ranked alongside such artists as Raphael in the 19th century and considered a paragon of pious medieval Christian artists—appealing to the Romantic tastes of that era—but his critical fortunes turned with 20th-century preferences and he was relegated by some scholars to the second tier of artists. The 500th anniversary of Memling’s death in 1994, however, saw a resurgence of interest in Memling’s work. In the years that have followed a number of high-profile exhibitions and related catalogues and essay collections have contributed greatly to the study of his work and legacy, as have a number of updated catalogues raisonnés. Today Memling is recognized as among the first rank of painters of the last quarter of the 15th century, particularly appreciated as a leading innovator in portraiture—among other contributions developing further the devotional portrait diptych—and credited with the development of novel new compositions (especially ingenious are the narrative panoramas). Memling is also recognized for his place among those northern artists identified as having a strong influence on developments in Italian art in the last quarter of the 15th century through his international clientele and the resulting presence and reception of his work in Florence in particular.

"... so merkt man ihr allerdings den achtzehnjährigen, unbeholfenen Komponisten an..."

2021 ◽  
Vol 73 (4) ◽  
pp. 355-367
Author(s):  
Bianca Schumann
Keyword(s):  
19Th Century ◽  
Significant Role ◽  
Large Scale ◽  
Hector Berlioz ◽  
Hugo Wolf ◽  
Daily Press ◽  
Decisive Influence ◽  
Starting Point ◽  
The Aesthetic ◽  
The 19Th Century

In the course of the aesthetic controversy of the 19th century over programme music, which was particularly intense in Vienna, 'conservative' as well as 'progressive' ciritcs, who wrote for the daily press, endeavoured to appropriate Hector Berlioz for their personal aesthetic convictions. Even for reviews written in the 1860s and 1870s, when Berlioz's large-scale works were first performed by leading Viennese orchestras, Robert Schumann's review of the Symphonie fantastique (1835) played a significant role. Schumann's appreciative assessment of the symphony, which was strongly influenced by his misconception that Berlioz was only eighteen years old at the time of composition of the Symphony fantastique, had a decisive influence on the journalistic discourse on Berlioz in Vienna far beyond the first half of the century, for example on Hugo Wolf and Edmund Schelle. Other critics, such as August Wilhelm Ambros and Eduard Hanslick, took Schumann's ambiguity as their starting point to validate their less positive judgements.

Resistance to Phytophthora infestans Clonal Lineage US-23 in Potato Cultivars and Its Relationship with Early Blight Resistance and Tuber Yield

Plant Disease ◽  
2021 ◽  
Author(s):  
Weiya Xue ◽  
Kathleen G. Haynes ◽  
Xinshun Qu
Keyword(s):  
Late Blight ◽  
Phytophthora Infestans ◽  
Early Blight ◽  
Tuber Yield ◽  
Late Blight Resistance ◽  
Field Trials ◽  
Potato Cultivars ◽  
Blight Resistance ◽  
Clonal Lineage ◽  
Progress Curve

Resistance to late blight, caused by Phytophthora infestans clonal lineage US-23, in 217 old and modern potato cultivars was evaluated in field trials in 2016 and 2017 in Pennsylvania. Significant differences in resistance were found among these cultivars (P < 0.0001). Significant interaction between cultivars and environments was found (P < 0.0001). The values of relative area under the disease progress curve ranged from 0 to 0.5841 in 2016 and from 0 to 0.5469 in 2017. Broad-sense heritability of late blight resistance was estimated to be 0.91 with a 95% confidence interval of 0.88 to 0.93. Cluster analysis classified the cultivars into 5 groups: resistant, moderately resistant, intermediate, moderately susceptible, and susceptible. Thirty cultivars showing resistance and 32 cultivars showing moderate resistance were identified. The 217 cultivars were also evaluated for foliar maturity, tuber yield and resistance to early blight, caused by Alternaria solani. A few cultivars with late blight resistance independent of late maturity were found. Late blight resistance and early blight resistance were positively correlated, and 17 cultivars possessed resistance to both diseases. Yield tradeoff associated with late blight resistance was not observed among the cultivars in the absence of disease pressure.

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