Viticulture: GRSPAV Virus Diversity in Algeria
- ALGIERS (AP) — A recent study has shed light on teh genetic variability of grapevine Rupestris Stem Pitting-Associated Virus (GRSPaV) within Algerian vineyards.
- The research, published in Phytopathologia Mediterranea The International Journal of the Mediterranean Phytopathological Union, focused on analyzing the complete capsid protein (CP) gene sequences of GRSPaV isolates collected...
- High-speed sequencing and bioinformatic analyses were used to determine the complete coding gene sequence (8,646 nt) of the Algerian GRSPaV isolate, alg99. The study categorized the Algerian GRSPaV...
Genetic Diversity of Grapevine Virus Explored in Algerian Vineyards
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ALGIERS (AP) — A recent study has shed light on teh genetic variability of grapevine Rupestris Stem Pitting-Associated Virus (GRSPaV) within Algerian vineyards. GRSPaV, a widespread virus affecting grapevines across numerous wine-producing regions, exhibits important genetic diversity, prompting researchers to investigate its prevalence and variations within Algeria.
The research, published in Phytopathologia Mediterranea The International Journal of the Mediterranean Phytopathological Union, focused on analyzing the complete capsid protein (CP) gene sequences of GRSPaV isolates collected from Algerian vineyards. The analysis revealed sequence similarities ranging from 76% to 99% among the isolates.
Key Findings on GRSPaV Genetic Structure
High-speed sequencing and bioinformatic analyses were used to determine the complete coding gene sequence (8,646 nt) of the Algerian GRSPaV isolate, alg99. The study categorized the Algerian GRSPaV isolates into four distinct groups, with the majority of sequences falling into groups III and IV.
According to the study, GRSPaV is the predominant grapevine virus reported in Algeria, with an infection rate of 57.92%, as noted by Bachir et al. in 2019.
Global Context of GRSPaV Prevalence
The prevalence of GRSPaV in Algerian vineyards aligns with its widespread presence in many wine-producing countries, as documented in studies by Martelli (1993), Digiaro et al. (1999), Meng and Gonsalves (2007), Fiore et al. (2016), Selmi et al. (2017), and Morelli et al. (2011). The virus’s high incidence in vineyards is primarily attributed to its dissemination through the propagation of infected vine material.
While the natural transmission methods of GRSPaV remain largely undescribed, the virus is frequently reported in both cultivated and wild grapevines throughout the Mediterranean basin, according to Pacifico et al. (2016) and Selmi et al.(2020).
Detailed Genetic Analysis of Algerian GRSPaV Strains
Examination of nucleotide relations between grspav isolates for CP genes showed that similarities ranged from 76 to 99 %. The Algerian strain of GRSPAV-N18 has shown the greatest similarity (99 %) with the CG1 strain.
The analysis revealed that certain strains are closely related. Such as, the DZGRSPAV-N09, DZ-GRSPAVN10, DZ-GRSPAV-N14 and DZ-GRSPAV-N15 strains presented a great nucleotide similarity but were different from the strains of GRSPAV-N11, DZGRSPAV-N13 and DZ-GRSPAVN17, which had a similarity of 92 to 97 %. The two strains DZGRSPAV-N16 and DZ-GRSPAVN18 had a low similarity between them and with the other Algerian strains.
Comparative Genetic Variability
These findings are consistent with other research. Selmi et al. (2020) reported significant variability in the CP gene of Tunisian strains, with nucleotide similarity ranging from 71% to 100%. Similarly, hu et al. (2015) observed considerable variability in Chinese strains, with nucleotide similarity ranging from 82% to 98%. Alabi et al. (2010) also documented significant genetic variability in GRSPaV CP and RDRP genes in the United States, with nucleotide similarities ranging from 79% to 100%.
A phylogenetic tree, constructed using sequenced samples and strains from Genbank, confirmed the results of nucleotide comparisons of Algerian strains and identified nine distinct groups. the Algerian sequences of GRSPaV were grouped into four categories (I, II, III, and IV), with the majority (eight) falling into groups III and IV.
Phylogenetic analysis by Selmi et al. (2020) showed that Tunisian GRSPaV sequences also clustered into four main groups (I, II, III, and IV), with group III primarily containing strains from commercial vines. However, Selmi et al.(2020) identified two new groups composed of Tunisian strains from spontaneous and cultivated Aboriginal vines, suggesting that confined natural habitats could serve as sources of viral diversity.
Distribution of GRSPaV Variants
Several studies have examined the distribution of grspav variants.Meng et al.(2006) reported that phylogenetic analyses based on the CP gene for table and wine grapes in the United States,Canada,and Italy were distributed in groups I,II,III,and IV. They found that 68% of GRSPaV variants belonged to groups I and II, 24% to group III, and only 8% to group IV. Hooker (2017) also reported that more than 50% of variants in the united States clustered in group IV, and 23% in group I.
The variations in viral strains might potentially be attributed to the widespread marketing of Vitis plant material infected with these variants.
Future Research directions
Further research on the infection rates of indigenous and wild vine varieties is recommended to enhance understanding of the distribution and evolution of GRSPaV in different regions of algeria.
Genetic Diversity of Grapevine Virus Explored in Algerian Vineyards: A Q&A
What is GRSPaV and Why is it Vital in Algerian Vineyards?
GRSPaV stands for Grapevine Rupestris Stem Pitting-Associated Virus.It’s a virus that affects grapevines, and in Algeria, a recent study has focused on its genetic variability. This is crucial because GRSPaV is widespread in many wine-producing regions and understanding its variations helps researchers manage and potentially mitigate its impact.
What Did the study in Algerian Vineyards Reveal?
The study analyzed the complete capsid protein (CP) gene sequences of GRSPaV isolates collected from Algerian vineyards. the analysis showed critically important genetic diversity, with sequence similarities ranging from 76% to 99% among the isolates.
What are the Key Findings on GRSPaV Genetic Structure in Algeria?
The researchers categorized the Algerian GRSPaV isolates into four distinct groups.The majority of the sequences fell into groups III and IV. One specific isolate, alg99, had its complete coding gene sequence (8,646 nt) resolute.
How Common is GRSPaV in Algerian Vineyards?
According to a 2019 study by bachir et al., GRSPaV is the predominant grapevine virus in Algeria, with an infection rate of 57.92%.
Is GRSPaV a Global Concern? What About the Mediterranean Basin?
Yes,grspav is a widespread concern