Identification and characterization of a new potyvirus infecting Muscari in Hungary

Abstract

Grape hyacinths (Muscari spp.) are popular spring flowering bulbs in Europe and also in Hungary. In the spring of 2017, we came across grape hyacinth plants showing mosaic symptoms, which indicated viral infection. Currently Hyacinth mosaic virus (genus Potyvirus), a proposed member of the genus named Muscari mosaic virus, Arabis mosaic virus (genus Nepovirus), Cucumber mosaic virus (genus Cucumovirus) and Tobacco rattle virus (genus Tobravirus) are known to infect grape hyacinth. Leaf samples of symptomatic grape hyacinths were observed, collected and the presence of potyviruses was proved with potyvirus specific monoclonal antibody by ELISA and by potyvirus specific RT-PCR. Laboratory host plants and seed grown Muscari plants were inoculated with leaf sap and symptoms were recorded. Nucleotide sequences of the cloned fragments were compared to GenBank data. In the case of Muscari ‘Helena’ the highest nucleotide identity in the coat protein coding region was found with two Muscari mosaic virus isolates (95.51% and 95.79%). In the case of the clones derived from Muscari ‘Pink Sunrise’ plant, the highest identity was recorded with Muscari mosaic virus isolates (57.65% and 57.80%) and with a Tulip breaking virus strain (55.13%) indicating the existence of a novel potyvirus species, tentatively named Muscari chlorotic mottle virus. The coat protein sequences were aligned and Maximum Likelihood trees were built to analyze phylogenetic relationships.

Grape hyacinths (Muscari) are popular spring flowering bulbs in Europe, including Hungary. Currently the Royal General Bulb Growers’ Association (KAVB)‘s ornamental plant database contains 25 species and 94 cultivars (Koninklijke Algemeene Vereeniging voor Bloembollencultuur (KAVB) 2020). Its popularity is attributed to its ability to perennialize, fast vegetative propagation (Bryan 2002; Jelitto et al. 1995), relative cheapness, and they are undemanding. Four native species of grape hyacinth are recorded in Hungary: Muscari botryoides, M. racemosum (syn. M. neglectum), M. tenuifolium and M. comosum. Muscari armeniacum is not native but it and its cultivars are widely grown, they sometimes escape from gardens but are not invasive (Simon 2000).

Arabis mosaic virus (Bellardi and Pisi 1989; Samuitienė et al. 2008; Sastry et al. 2019), Cucumber mosaic virus (Navalinskienė and Samuitienė 2001; Samuitienė and Navalinskienė 2008; Sastry et al. 2019), Tobacco rattle virus (Navalinskienė and Samuitienė 2001; Sastry et al. 2019) have been reported from grape hyacinths. Potyviruses are also known to infect spring flowering bulbous plants. Currently Hyacinth mosaic virus is known as the only recognized potyvirus species capable of infecting Muscari (Alexandre et al. 2017; de Best et al. 2000; Derks and Vink-van den Abeele 1980; Pham et al. 2011; Sastry et al. 2019). Symptoms include light or dark green stripes and flecks on the foliage. Cultivars may show symptoms briefly in the growing season (de Best et al. 2000). Muscari mosaic virus (MuMV) is a proposed member of the genus Potyvirus that has not yet been approved as a species by the ICTV was also reported infecting Muscari in Latvia, the Netherlands and in Taiwan (Chiang and Chen 2011; Navalinskienė and Samuitienė 2001, 2006; Pham et al. 2011; Sastry et al. 2019). Nucleotide sequence data of the coat protein is available from the Netherlands and Taiwan (Acc. No.: EU042752; Acc. No.: HQ400612) and they have 98.93% identity.

In the spring of 2017, we came across grape hyacinths showing mosaic symptoms in a nursery in Nyársapát, Central Hungary (GPS reference N47.087373, E19.780381), where symptomatic leaf samples of Muscari cultivars ‘Helena’ and ‘Pink Sunrise’ were collected on March 28, 2018. Samples were transported dry, on ice and stored at −70 °C until further processing.

Symptom development was observed in 2017, 2018, 2019 and 2020 under open field conditions and in a vector free greenhouse. In both populations the disease occurrence was 100%, symptoms were most visible in early spring at bud emergence, and became masked with warm weather and after flowering. Symptoms on the abaxial surface of the leaves were more prominent, as the adaxial side has a waxy layer.

Helena cultivar had light green or greenish yellow 2–3 mm wide bands mainly in the middle part of the lamina in the entire length of the leaves (Fig. 1a). These bands become wider as bud development and flowering proceeded. After flowering the bands faded.

Fig. 1
figure1

a Muscari ‘Helena’ and b Muscari ‘Pink Sunrise’ plants grown under open field conditions

In the case of Pink Sunrise cultivar, the symptoms were different (Fig. 1b). Leaves had a general yellow-green appearance, the mosaic was mottle-like, 0.2–1 mm wide yellow to yellow green stripes, occasionally dark green. The stripes were also visible on the leaf margin and more prominent near the veins. As flowering progressed markings became masked, but the general yellower appearance persisted. Interestingly, in 2019 after a 5-day cold spell in May symptoms re-appeared on the foliage, and disappeared when temperature increased. In the case of the infected plants no symptoms appeared on the petals, and plants set seed. Compared to M. armeniacum the seed set and general vigor of the plants were decreased, wilting occurred 7 to 10 days earlier each year.

Laboratory test plants Chenopodium murale, Nicotiana benthamiana and N. tabacum ‘Xanthi’ were sap inoculated and maintained for 6 weeks after inoculation to observe symptoms. During the 6-week period no symptoms were observed on laboratory host plants, which indicated potyvirus infection. Muscari armeniacum seedlings were also sap inoculated to fulfill Koch’s postulates. The inoculated plants did not show symptoms in the first vegetative season, which is in accordance with former observations on other spring flowering bulbous plants (de Best et al. 2000; Dekker et al. 1993; Valverde et al. 2012). Since the dormancy period of M. armeniacum is short, bulbs in moist soils and substrates re-grow in August under Hungarian climatic conditions. The freshly grown leaves showed mosaic symptoms in both cases (data not shown).

ELISA tests were carried out in duplicates on samples based on potyvirus specific MAb PTY1 (Jordan and Hammond 1991) antibody supplied by Agdia according to the instructions provided. For negative controls Ch. murale seedlings grown in a vector free greenhouse were used, positive controls were provided by the supplier in the kit. Absorbance values of the negative controls were 0.034 and 0.047; of M. ‘Helena’ samples 1.594 and 1.647 and of M. ‘Pink Sunrise’ samples 1.713 and 1.751. These results indicated potyvirus infection in both cases.

To identify the potyvirus species total RNA extraction was carried out by the method described by White and Kaper (1989). First strand cDNA was synthetized with RevertAid First Strand cDNA Synthesis Kit (ThermoScientific), with poly T2 reverse primer (5′- CGGGGATCCTCGAGAAGCTTTTTTTTTTTTTTTTT −3′) described by Salamon and Palkovics (2005). For the amplification of the C terminus of the NIb, the complete coat protein, the complete 3’UTR region and part of the polyA tail universal potyvirus forward primer poty7941 (5′- GGAATTCCCGCGGNAAYAAYAGYGGNCARC C -3′) and poly T2 were used (Salamon and Palkovics 2005). PCR products about 1600 bp length were excised and purified with High Pure PCR Product Purification Kit (ROCHE) then ligated into pGEM®-T Easy vector (Promega). The nucleotide sequences were determined and deposited in the GenBank (Muscari ‘Helena’ Acc. No.: MK642311, Muscari ‘Pink Sunrise’ Acc. No.: MK642312). To verify whether a single potyvirus species is present in the infected Muscari plants, the original PCR products were digested with restriction enzymes present in the determined sequences (Acc. No.: MK642311: EcoRV; Acc. No.: MK642312: HpaI). In both cases the PCR products were completely digested and resulted exclusively the two predicted restriction fragments, indicating the presence of a single potyvirus species in the infected plants, respectively.

Each nucleotide sequence was compared to available sequences in the GenBank using megaBLAST module (Morgulis et al. 2008) and the nucleotide sequences were uploaded to GenBank.

The full coat protein region acquired from cultivar Helena had 95.895% nucleotide identity with Acc. No.: EU042752 and 96.019% with Acc. No.: HQ400612, while it had 95.895% amino acid (aa) identity with both isolates, which are isolates of Muscari mosaic virus, a proposed member of the genus Potyvirus. The sequence of the Hungarian isolate shared 60.523% nt and 63.805% aa identity with the most closely-related accepted potyvirus species, Japanese yam mosaic virus Acc. No. AB027007. Nucleotide analyses demonstrated that cv. Helena was infected with an isolate belonging to the tentative potyvirus species Muscari mosaic virus.

According to the BLAST results the complete coat protein region derived from M. ‘Pink Sunrise’ had the highest nt identity with the previously analyzed Muscari mosaic virus isolate, of only 66.169% nt (65.298% aa) (Acc. No.: MK642311) and with the two other Muscari mosaic virus isolates 66.044% nt (64.925% aa) and 65.769% nt (65.298% aa) (Acc. No.: EU042752 and HQ400612), respectively. For the complete coat protein region, the highest nt identity among accepted potyvirus species was found with a Tulip breaking virus strain (Acc. No.: MH886517), 63.692% (64.419% aa). Interestingly, for the 440 nt long carboxy-terminal region of the CP the highest identity was 76% with Plum pox virus D serotypes, but for the complete CP region it was just 61.192% (59.854% aa). According to the 10th ICTV Report on Virus Taxonomy species demarcation criteria require less than 76% nt identity and less than 82% aa identity in the polyprotein or coat protein region in the case of different potyvirus species (Wylie et al. 2017). Based on these results a new potyvirus species was identified in grape hyacinth tentatively named Muscari chlorotic mottle virus.

For phylogenetic analyses MEGA X was program was used (Kumar et al. 2018). ClustalW (Larkin et al. 2007) alignments were built from the nucleotide and amino acid sequences of the complete CP regions of the potyviruses with the highest similarity according to the BLAST results. The following accessions were included: Bean yellow mosaic virus (MK131270), Hippeastrum mosaic virus (MK132192), Hyacinth mosaic virus (KY828925), Iris mild mosaic virus (MH886513), Iris severe mosaic virus (KT692938), Japanese yam mosaic virus (AB027007), Konjac mosaic virus (LC114490), Lily mottle virus (MF983709, GU440578), Muscari chlorotic mottle virus (MK642312), Muscari mosaic virus (EU042752, HQ400612, MK642311), Narcissus yellow stripe virus (KU516386), Ornithogalum mosaic virus (KY769748), Plum pox virus (LC375129, X81084), Scallion mosaic virus (LC064112), Sweet potato virus G (HQ844189, MK778833), Tobacco etch virus (NC_001555), Tulip breaking virus (MH886517, MF983710), Turnip mosaic virus (AP017756) and Ryegrass mosaic virus (NC_001814) as outgroup. The best fit DNA model with the lowest corrected Akaike Information Criterion (AIC) value was used (Nei and Kumar 2000) to construct a Maximum Likelihood (ML) tree (Felsenstein 1981; Guindon and Gascuel 2003) for CP nt and aa sequences. The reliability of the trees were tested with the Bootstrap method (Felsenstein 1985) with 1000 replications. For the nt Time Reversible model (Tavaré 1986) with Gamma distribution and invariant sites was used, for aa LG model (Le and Gascuel 2008) was used with gamma distribution to build Maximum Likelihood trees. The phylogenetic analysis has shown that the two virus isolates from Muscari species form separate monophyletic groups. (Figs. 2 and 3). In both trees hyacinth mosaic virus, muscari mosaic virus and muscari chlorotic mottle virus are forming a distinct clade, which means they had a common ancestor. Hyacinth mosaic virus and muscari mosaic virus are more closely related to each other than muscari chlorotic mottle virus, which is supported by high Bootstrap values (99–100%).

Fig. 2
figure2

Maximum Likelihood phylogenetic tree built from the nucleotide sequences of the complete CP regions of Muscari mosaic virus and Muscari chlorotic mottle virus isolates and potyvirus isolates retrieved from the GenBank

Fig. 3
figure3

Maximum Likelihood phylogenetic tree built from the amino acid sequences of the complete CP regions of Muscari mosaic virus and Muscari chlorotic mottle virus isolates and potyvirus isolates retrieved from the GenBank

In the present survey symptomatic Muscari cultivars were tested from Hungary. To fulfill Koch’s postulates seed grown M. armeniacum plants were inoculated and symptoms were observed in the next vegetative period, which is in accordance with earlier findings in spring flowering bulbous plants (de Best et al. 2000; Dekker et al. 1993; Valverde et al. 2012).

This is the first report of successful detection of Muscari chlorotic mottle virus by MAb PTY1 antibody. The fulfillment of Koch’s postulates, positive ELISA tests, the determination of the complete coat protein sequences and the phylogenetic analyses clearly demonstrate that this potyvirus is a novel species, and distinct from other potyviruses. This is the first time that Muscari mosaic virus has been detected and reported from Hungary, and it is one out of only three MuMV sequences deposited in GenBank.

Our results show, that beside Hyacinth mosaic virus two other candidate members of the genus Potyvirus can infect and cause mosaic symptoms on grape hyacinth plants (Chiang and Chen 2011; Navalinskienė and Samuitienė 2001, 2006; Pham et al. 2011). Since the primary hosts for all potyviruses are supposed to be monocotyledonous bulbs and grasses (Ohshima 2012) the further analysis of these viruses may result in the better understanding of the evolution of potyviruses.

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Acknowledgements

Our research was supported by grants EFOP-3.6.1-16-2016-00006 “The development and enhancement of the research potential at John von Neumann University” awarded by the Hungarian Government and co-financed by the European Social Fund, and Higher Education Institutional Excellence Program, NKFIH-1159-6/2019 grant by the Ministry for Innovation and Technology.

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Open Access funding provided by Szent István University.

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Correspondence to László Palkovics.

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Supplementary Information

Online resource 1

MuscariCPntCW p-distances.xlsx, MatrixOutput sheet contains the p-distances calculated with Mega X. Identity % sheet contains the nucleotide pairwise identity % of the complete coat protein sequences of the isolates from whose the ML tree was built. Identity% = (1-(p-distane))*100. (XLSX 24 kb)

Online Resource 2

MuscariCPaaCW p-distances.xlsx, MatrixOutput sheet contains the p-distances calculated with Mega X. Identity % sheet contains the amino acid pairwise identity % of the complete coat protein sequences of the isolates from whose the ML tree was built. Identity% = (1-(p-distane))*100. (XLSX 23 kb)

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Ágoston, J., Almási, A., Salánki, K. et al. Identification and characterization of a new potyvirus infecting Muscari in Hungary. Eur J Plant Pathol 159, 685–691 (2021). https://doi.org/10.1007/s10658-020-02182-8

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Keywords

  • Muscari mosaic virus
  • Muscari chlorotic mottle virus
  • Potyvirus
  • ELISA
  • Hungary