First Report of Cotton Leafroll Dwarf Virus Infecting Cotton in Georgia, U.S.A.

Tabassum, Afsha; Bag, Sudeep; Roberts, Phillip M.; Suassuna, N. D.; Chee, Peng W.; Whitaker, Jared R.; Conner, Kassie; Brown, Judith K.; Nichols, Robert L.; Kemerait, Robert C.

doi:10.1094/pdis-12-18-2197-pdn

Cited by 30 publications

(18 citation statements)

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“…In addition to Africa and South America, CLRDV has also been reported in Timor-Leste [ 14 ], Thailand [ 15 ], India [ 16 ], and from Soybean aphid ( Aphis glycines ) in China [ 17 ]. Recently, there have been several reports on the detection of CLRDV in the USA: Arkansas [ 18 ], Alabama [ 19 ], Florida [ 20 ], Georgia [ 21 ], Kansas [ 22 ], Louisiana [ 23 ], Mississippi [ 24 ], North Carolina [ 25 ], Oklahoma [ 26 ], South Carolina [ 27 ] and Texas [ 28 ]. Since the first report of CLRDV, it has been detected in all the major cotton-growing counties in Georgia with 0–30% of disease incidence.…”

Section: Introductionmentioning

confidence: 99%

Genome analysis of cotton leafroll dwarf virus reveals variability in the silencing suppressor protein, genotypes and genomic recombinants in the USA

et al. 2021

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Cotton leafroll dwarf virus (CLRDV) is an emerging virus in cotton production in Georgia and several other Southeastern states in the USA. To better understand the genetic diversity of the virus population, the near complete genome sequences of six isolates from Georgia and one from Alabama were determined. The isolates sequenced were 5,866 nucleotides with seven open reading frames (ORFs). The isolates from Georgia were >94% identical with other isolates from the USA and South America. In the silencing suppressor protein (P0), at amino acid position 72, the isolates from Georgia and Alabama had a valine (V), similar to resistant-breaking ‘atypical’ genotypes in South America, while the Texas isolate had isoleucine (I), similar to the more aggressive ‘typical’ genotypes of CLRDV. At position 120, arginine (R) is unique to Georgia and China isolates, but absent in Alabama, Texas and South American isolates. Ten potential recombinant events were detected in the isolates sequenced. An increased understanding of CLRDV population structure and genetic diversity will help develop management strategies for CLRDV in the USA cotton belt.

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Section: Introductionmentioning

confidence: 99%

Genome analysis of cotton leafroll dwarf virus reveals variability in the silencing suppressor protein, genotypes and genomic recombinants in the USA

et al. 2021

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“…Cotton leafroll dwarf virus (CLRDV), a phloem-limited virus, is associated with the emerging cotton leafroll dwarf disease (CLRDD) in the United States. It was first reported from Alabama in 2019 ( 2 ) and subsequently from the major cotton-growing regions in the United States, including Florida ( 3 ), Georgia ( 4 ), Louisiana ( 5 ), Mississippi ( 6 ), South Carolina ( 7 ), and Texas ( 8 ). Symptoms of the disease include reddening of the leaves and petioles and drooling, crinkling, and deformation of the leaves ( Fig.…”

Section: Announcementmentioning

confidence: 99%

“…In summer 2018, symptomatic plants ( n = 20) showing reddening, drooling of leaves, and reddening of petioles, along with asymptomatic plants ( n = 20), were collected from three counties, Early, Seminole, and Tift, in Georgia. CLRDV was detected from symptomatic samples but not from the asymptomatic tissue tested ( 4 ). To understand the genomic composition of CLRDV from Georgia, a nearly complete genome of an isolate from Seminole County was sequenced using Sanger’s method and analyzed.…”

Section: Announcementmentioning

confidence: 99%

Genome Sequence of Cotton Leafroll Dwarf Virus Infecting Cotton in Georgia, USA

Tabassum

Roberts

Bag

2020

Microbiol Resour Announc

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“…Cotton yield losses up to 80% have been observed from CLRDV in South America (Silva et al, 2008), and the virus is now an emerging threat to cotton production in the United States (Avelar et al, 2019). CLRDV was first reported in Alabama in 2017 (Avelar et al, 2019) and has subsequently been documented in 10 other cotton producing states, with disease incidence varying from less than 1% to more than 20% across the United States cotton belt (Aboughanem-Sabanadzovic et al, 2019;Tabassum et al, 2019;Alabi et al, 2020;Faske et al, 2020;Iriarte et al, 2020;Price et al, 2020;Thiessen et al, 2020;Wang et al, 2020). Interestingly, cotton plants infected with the United States strains of CLRDV showed different symptoms from CBD; therefore, the disease caused by this virus has been named as cotton leafroll dwarf disease (CLRDD; Brown et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Numerous symptoms have been associated with CLRDD. A few of the notable symptoms include reddening of leaves and petioles, leaf wilting, subsequent drooping, crinkling, and deformation of the leaves above the nodes, which had reddened leaves, development of intense green foliage, and shortening of upper internodes resulting in stunted plants (Tabassum et al, 2019(Tabassum et al, , 2020Bag et al, 2021). Severe disease infection could result in reduced boll set and lower seed-cotton yield per plant (Avelar et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Effect of Cotton Leafroll Dwarf Virus on Physiological Processes and Yield of Individual Cotton Plants

et al. 2021

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Cotton leafroll dwarf disease (CLRDD) caused by cotton leafroll dwarf virus (CLRDV) is an emerging threat to cotton production in the United States. The disease was first reported in Alabama in 2017 and subsequently has been reported in 10 other cotton producing states in the United States, including Georgia. A field study was conducted at field sites near Tifton, Georgia in 2019 and 2020 to evaluate leaf gas exchange, chlorophyll fluorescence, and leaf temperature responses for a symptomatic cultivar (diseased plants observed at regular frequency) at multiple stages of disease progression and for asymptomatic cultivars (0% disease incidence observed). Disease-induced reductions in net photosynthetic rate (An, decreased by 63–101%), stomatal conductance (gs, decreased by 65–99%), and efficiency of the thylakoid reactions (32–92% decline in primary photochemistry) were observed, whereas leaf temperature significantly increased by 0.5–3.8°C at advanced stages of the disease. Net photosynthesis was substantially more sensitive to disease-induced declines in gs than the thylakoid reactions. Symptomatic plants with more advanced disease stages remained stunted throughout the growing season, and yield was reduced by 99% by CLRDD due to reductions in boll number per plant and declines in boll mass resulting from fewer seeds per boll. Asymptomatic cultivars exhibited more conservative gas exchange responses than apparently healthy plants of the symptomatic cultivar but were less productive. Overall, it is concluded that CLRDV limits stomatal conductance and photosynthetic activity of individual leaves, causing substantial declines in productivity for individual plants. Future studies should evaluate the physiological contributors to genotypic variation in disease tolerance under controlled conditions.

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First Report of Cotton Leafroll Dwarf Virus Infecting Cotton in Georgia, U.S.A.

Cited by 30 publications

References 5 publications

Genome analysis of cotton leafroll dwarf virus reveals variability in the silencing suppressor protein, genotypes and genomic recombinants in the USA

Genome analysis of cotton leafroll dwarf virus reveals variability in the silencing suppressor protein, genotypes and genomic recombinants in the USA

Genome Sequence of Cotton Leafroll Dwarf Virus Infecting Cotton in Georgia, USA

Effect of Cotton Leafroll Dwarf Virus on Physiological Processes and Yield of Individual Cotton Plants

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