Viral Diseases in Potato

Kreuze, Jan; Souza-Dias, J. A. C. de; Jeevalatha, A.; Figueira, A.R.; Valkonen, Jari P. T.; Jones, R. A. C.

doi:10.1007/978-3-030-28683-5_11

Cited by 124 publications

(128 citation statements)

References 104 publications

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“…The story in our review started in 1931, with PVY, one of the first two described viruses of potato, but now, nine decades later, at least 49 more viruses of potato have been recorded [163]. The group of viruses, of which PVY is the type, is now represented in GenBank by genomic sequences of more than 150 different potyviruses and a third as many other potyvirids.…”

Section: Discussionmentioning

confidence: 99%

The Potyviruses: An Evolutionary Synthesis Is Emerging

Gibbs

Hajizadeh

Ohshima

et al. 2020

Viruses

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In this review, encouraged by the dictum of Theodosius Dobzhansky that “Nothing in biology makes sense except in the light of evolution”, we outline the likely evolutionary pathways that have resulted in the observed similarities and differences of the extant molecules, biology, distribution, etc. of the potyvirids and, especially, its largest genus, the potyviruses. The potyvirids are a family of plant-infecting RNA-genome viruses. They had a single polyphyletic origin, and all share at least three of their genes (i.e., the helicase region of their CI protein, the RdRp region of their NIb protein and their coat protein) with other viruses which are otherwise unrelated. Potyvirids fall into 11 genera of which the potyviruses, the largest, include more than 150 distinct viruses found worldwide. The first potyvirus probably originated 15,000–30,000 years ago, in a Eurasian grass host, by acquiring crucial changes to its coat protein and HC-Pro protein, which enabled it to be transmitted by migrating host-seeking aphids. All potyviruses are aphid-borne and, in nature, infect discreet sets of monocotyledonous or eudicotyledonous angiosperms. All potyvirus genomes are under negative selection; the HC-Pro, CP, Nia, and NIb genes are most strongly selected, and the PIPO gene least, but there are overriding virus specific differences; for example, all turnip mosaic virus genes are more strongly conserved than those of potato virus Y. Estimates of dN/dS (ω) indicate whether potyvirus populations have been evolving as one or more subpopulations and could be used to help define species boundaries. Recombinants are common in many potyvirus populations (20%–64% in five examined), but recombination seems to be an uncommon speciation mechanism as, of 149 distinct potyviruses, only two were clear recombinants. Human activities, especially trade and farming, have fostered and spread both potyviruses and their aphid vectors throughout the world, especially over the past five centuries. The world distribution of potyviruses, especially those found on islands, indicates that potyviruses may be more frequently or effectively transmitted by seed than experimental tests suggest. Only two meta-genomic potyviruses have been recorded from animal samples, and both are probably contaminants.

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Section: Discussionmentioning

confidence: 99%

The Potyviruses: An Evolutionary Synthesis Is Emerging

Gibbs

Hajizadeh

Ohshima

et al. 2020

Viruses

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“…It was shown that a single mutation can shift the outcome [14]. On the other hand, studies of PVY strains showed an exceptional diversification via nucleotide mutation and genome recombination resulting in new strains and isolates with different degrees of pathogenicity [1,[15][16][17]. Often, outcomes of the interaction in the same potato genotype are different, depending on PVY strain, as was shown for PVY N and PVY NTN in cvs.…”

Section: Introductionmentioning

confidence: 99%

“…Potato virus Y (PVY) is the most economically important virus affecting potato production worldwide [1]. It severely affects potato production in terms of crop yield and quality, which, in the case of secondary infections, can reach yield reductions up to 85% [2,3].…”

Section: Introductionmentioning

confidence: 99%

Plant Molecular Responses to Potato Virus Y: A Continuum of Outcomes from Sensitivity and Tolerance to Resistance

Baebler

Coll

Gruden

2020

Viruses

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Potato virus Y (PVY) is the most economically important virus affecting potato production. PVY manipulates the plant cell machinery in order to successfully complete the infecting cycle. On the other side, the plant activates a sophisticated multilayer immune defense response to combat viral infection. The balance between these mechanisms, depending on the plant genotype and environment, results in a specific outcome that can be resistance, sensitivity, or tolerance. In this review, we summarize and compare the current knowledge on molecular events, leading to different phenotypic outcomes in response to PVY and try to link them with the known molecular mechanisms.

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“…Its production is of particular economic importance, with potato ranked fourth globally in food crops behind maize, wheat and rice (Djebli et al, 2020). In the last decades, global production increased at a much higher rate with regard to other staple crops (Kreuze et al, 2020). In Canada, a 23% increase in potato production was observed from 2008 to 2018 (FAO, 2018).…”

Section: Introductionmentioning

confidence: 99%