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Neonectria liriodendri sp. nov., the main causal agent of black foot disease of grapevines

¹ ARC Infruitec-Nietvoorbij (The Fruit, Vine and Wine Institute of the Agricultural Research Council), P. Bag X5026, Stellenbosch, 7599, and the Department of Plant Pathology, University of Stellenbosch, P. Bag X1, Matieland 7602, South Africa
² Agricultural Institute of Slovenia, Hacquetova 17, p.p. 2553, 1001 Ljubljana, Slovenia
³ Centraalbureau voor Schimmelcultures, Fungal Biodiversity Centre, P.O. Box 85167, 3508 AD, Utrecht, The Netherlands
⁴ Laboratório de Patologia Vegetal "Veríssimo de Almeida", Tapada da Ajuda, 1349-017 Lisboa, Portugal
⁵ Instituto Superior de Agronomia, Tapada da Ajuda, 1349-017 Lisboa, Portugal

^* Correspondence: Francois Halleen, halleenf{at}arc.agric.za

	Abstract

TOP Abstract INTRODUCTION MATERIALS AND METHODS RESULTS DISCUSSION References

 
Black foot disease is a serious disease of grapevine crops in most areas where vines are grown. Mainly two species of Cylindrocarpon, C. destructans and C. macrodidymum, are associated with this disease. Recent studies have revealed a tremendous molecular variation within the former but only slight molecular variation within the latter, indicating that C. destructans presents a complex of several species The present study elucidates the taxonomic status of C. destructans-like isolates associated with black foot disease of grapevines. Grapevine isolates were studied morphologically, subjected to DNA analyses of their ITS and partial β-tubulin genes, and were mated in all combinations in vitro. Cylindrocarpon destructans strains isolated from grapevines in Europe and South Africa appeared morphologically and genetically identical, and had identical ITS and partial β-tubulin gene sequences. Phylogenetic analyses placed these strains in a clade closely related but clearly distinct from other clades with C. destructans-like anamorphs obtained from various herbaceous or woody hosts. Only the ex-type strain of Cylindrocarpon liriodendri had identical sequences to strains isolated from grapevines, and could also not be distinguished by morphological characters. The grapevine isolates are therefore reidentified here as Cylindrocarpon liriodendri. Cylindrocarpn liriodendri formed perithecia in heterothallic conditions and the holomorph of this species is described as Neonectria liriodendri sp. nov. Neonectria liriodendri is genetically distinct from the ex-type strain of Neonectria radicicola, which originated from Cyclamen in Sweden. Both ex-type strains also differ from at least two other clades comprising additional C. destructans-like strains. Many of these strains originated from Panax sp., which is the host of the type of C. destructans. Our phylogenetic analyses indicate that C. destructans is not the anamorph of N. radicicola and that N. liriodendri, N. radicicola and several C. destructans-like taxa may have evolved independently within the same phylogenetic species complex.

Taxonomic novelty: Neonectria liriodendri Halleen, Rego & Crous sp. nov.

Keywords β-tubulin gene / black foot disease / Cylindrocarpon / internal transcribed spacer regions / Nectriaceae / phylogeny / systematics / Vitis

	INTRODUCTION

TOP Abstract INTRODUCTION MATERIALS AND METHODS RESULTS DISCUSSION References

 
In recent years, two species of Cylindrocarpon Wollenw. have been associated with black foot disease of grapevines (Vitis spp.). Cylindrocarpon destructans (Zinnsm.) Scholten [anamorph of Neonectria radicicola (Gerlach & L. Nilsson) Mantiri & Samuels] was first recorded on grapevine in France in 1961 (Maluta & Larignon 1991). Since then it has been isolated from diseased vines in Tasmania (Sweetingham 1983), Sicily (Grasso 1984), Portugal (Rego 1994, Rego et al., 2000, 2001), Pennsylvania, U.S.A. (Gugino & Travis 2003), New Zealand and South Africa (Halleen et al. 2004). Various unidentified species of Cylindrocarpon have also been isolated from young vines and from declining vines with basal rot or root necrosis in Australia (Edwards & Pascoe 2004), Chile (Auger et al. 1999), Greece (Rumbos & Rumbou 2001), Spain (Armengol et al. 2001) and South Africa (Fourie et al. 2000, Fourie & Halleen 2001). In a recent taxonomic study, a second species, newly described as C. macrodidymum Schroers, Halleen & Crous (anamorph of Neonectria macrodidyma Halleen, Schroers & Crous) was associated with the disease. These isolates were obtained from grapevines in South Africa, Tasmania, New Zealand and Canada (Halleen et al. 2004). It is possible that C. macrodidymum was earlier incorrectly identified on grapevines as Cylindrocarpon obtusisporum (Cooke & Harkn.) Wollenw. (Grasso & Magnano di San Lio 1975, Scheck et al. 1998). Furthermore, Campylocarpon Halleen, Schroers & Crous, a newly described genus, which is Cylindrocarpon-like in morphology, has also been associated with the disease in South Africa (Halleen et al. 2004).

Booth (1966) artificially segregated Cylindrocarpon species into four groups based on the presence or absence of microconidia and chlamydospores. Cylindrocarpon magnusianum (Sacc.) Wollenw. (+ chlamydospores; – microconidia), which is the anamorph of the type species of Neonectria Wollenw., C. cylindroides Wollenw. (– chlamydospores; – microconidia), which is the type species of the genus Cylindrocarpon, and members of Cylindrocarpon species predominantly connected with teleomorphs of the Nectria mammoidea W. Phillips & Plowr. group (– chlamydospores; + microconidia) were core members of three of these anamorphic groups delineated by Booth (1966). A fourth group was centred on C. destructans (+ chlamydospores; + microconidia), which generally is accepted as the anamorph of Neon. radicicola. Rossman et al. (1999), Mantiri et al. (2001) and Brayford et al. (2004) recently transferred representatives of all "Nectria" groups with Cylindrocarpon anamorphs into Neonectria. Mantiri et al. (2001) and Brayford et al. (2004) analysed mitochondrial small subunit (SSU) ribosomal DNA (rDNA) sequence data of some of the species and concluded that the Neonectria/Cylindrocarpon species grouped together by this reclassification were monophyletic. However, these authors also found that this overall Neonectria/Cylindrocarpon clade included distinct subclades corresponding to at least three of the four groups delineated by Booth (1966). Significant molecular variation among taxa with Cylindrocarpon-like anamorphs was found by Seifert et al. (2003), in a study on fungi causing root rot of ginseng (Panax quinquefolius) and other hosts, encountered significant molecular variation particularly among Cylindrocarpon destructans-like strains and suggested that Neon. radicicola/C. destructans may present a complex of various species. Halleen et al. (2004) added an additional phylogenetic clade mainly comprising of root and rootstock pathogens of grapevines, that conformed well to the morphological concept of C. destructans. Although Halleen et al. (2004) referred to the primary causal organism of black foot disease of grapevine as C. destructans, the ex-type strain of Neon. radicicola CBS 264.65 did not form part of the clade comprising of grapevine isolates, nor did isolates from Panax, which is the host from which Booth (1966) selected the neotype of C. destructans. The aim of the present study was to determine the correct identity of C. destructans-like isolates occurring on grapevines. In order to do this, strains isolated from grapevines in several countries were subjected to DNA analyses of their ITS and β-tubulin genes and to mating studies in vitro.

	MATERIALS AND METHODS

TOP Abstract INTRODUCTION MATERIALS AND METHODS RESULTS DISCUSSION References

 
Isolates
Cylindrocarpon destructans strains, previously isolated from diseased grapevines in Portugal (Rego 1994, Rego et al. 2001), France, South Africa and New Zealand (Halleen et al. 2004), were obtained from the collection of the Centraalbureau voor Schimmelcultures in Utrecht, the Netherlands (CBS) (Table 1). Disease symptoms associated with these isolates include various forms of decline as well as typical black foot symptoms.

DNA phylogeny
Mycelium was grown in tubes with 2 mL of complete medium (Raper & Raper 1972) and DNA was extracted using the FastDNA® Kit (Bio 101, Carlsbad, CA, U.S.A.). PCR amplification and sequencing of the partial β-tubulin gene introns and exons and the ITS rDNA, was performed as described by Halleen et al. (2004). Newly generated sequences have been deposited in GenBank (Table 1).

Additional sequences were obtained from GenBank and added to the alignment. Sequences were manually aligned using Sequence Alignment Editor v. 2.0a11 (Rambaut 2002). In phylogenetic trees, downloaded sequences are indicated by their GenBank accession numbers; newly generated sequences are indicated by CBS strain numbers. A member of Campylocarpon (Halleen et al. 2004) was used as outgroup. Two datasets were created; analysis of the datasets in PAUP* 4.0b10 (Swofford 2002) consisted of distance (using the uncorrected "p", Jukes-Cantor and HKY85 substitution models) and parsimony analyses as described by Halleen et al. (2004). For the parsimony analyses, heuristic searches were performed with 100 random taxon additions. Two gaps of more than 10 characters each (caused by the outgroup sequence) were coded as a single character in the ITS alignment in TreeBASE (S1511, M2716).

View larger version (19K): [in this window] [in a new window]   Fig. 1. One of 61 most parsimonious trees obtained from a heuristic search with 100 random taxon additions of the ITS sequence alignment. The scale bar shows 10 changes and bootstrap support values from 1000 replicates are shown at the nodes. Thickened lines indicate the strict consensus branches and ex-type strains are shown in bold print. The host genus or source is indicated next to the GenBank accession numbers for the taxa in the "C. destructans" complex. The tree was rooted to Campylocarpon pseudofasciculare AY677306.

View larger version (16K): [in this window] [in a new window]   Fig. 2. One of 180 most parsimonious trees obtained from a heuristic search with 100 random taxon additions of the β-tubulin sequence alignment. The scale bar shows a single change and bootstrap support values from 1000 replicates are shown at the nodes. Thickened lines indicate the strict consensus branches and type strains are shown in bold print. The host genus or source is indicated next to the GenBank accession numbers for the taxa in the "C. destructans" complex. The tree was rooted to Campylocarpon pseudofasciculare AY677214.

View larger version (119K): [in this window] [in a new window]   Fig. 3. Neonectria liriodendri and its Cylindrocarpon liriodendri anamorph. A–C. Perithecia on beach toothpicks. D. Perithecium mounted in lactic acid. E–H. Sections though perithecia, showing wall anatomy and ostiolar area. I–K. Asci. L–N. Ascospores. O–P. Conidiophores. Q–S. Macroconidia. T–U. Subcylindrical, ellipsoid and ovoid microconidia. V. Chlamydospores in chains. Scare bars: A = 90 µm, B–C = 70 µm, D = 30 µm, E = 80 µm, F = 26 µm, G–H = 20 µm, I–K = 5 µm, L–N = 3 µm, O–S = 5 µm, T–U = 4 µm, V = 15 µm.

	RESULTS

TOP Abstract INTRODUCTION MATERIALS AND METHODS RESULTS DISCUSSION References

The manually adjusted β-tubulin alignment contained 55 taxa and 327 characters including alignment gaps. Of the 327 characters, 33 were parsimony-informative, 39 were variable and parsimony-uninformative, and 255 were constant. Parsimony analysis of the β-tubulin data yielded 180 most parsimonious trees (TL = 103 steps; CI = 0.864; RI = 0.959; RC = 0.829), one of which is shown in Fig. 2. The topology of the trees generated with neighbor-joining analysis using the three substitution models and the trees obtained using parsimony only differed in the order of the isolates in the "C. destructans" clade (data not shown). As with the ITS tree, isolates of C. liriodendri form a well-defined clade (bootstrap support value of 93 %), but the two isolates of Neon. radicicola group together in a poorly supported clade (56 % bootstrap support). Isolates in the "C. destructans" complex clade (75 % bootstrap support) are mainly in basal positions with a small number of defined clades with high bootstap support values. Neonectria coprosmae is also included in this clade.

View larger version (32K): [in this window] [in a new window]   Fig. 4. Neonectria liriodendri and its Cylindrocarpon liriodendri anamorph (CBS H-17776). Scale bar = 10 µm.

Anamorph: Cylindrocarpon liriodendri J.D. MacDon. & E.E. Butler, Plant Disease 65: 156. 1981.

Neonectriae radicicolae similis sed ascosporis levibus vel verruculosis, et peritheciis levibus vel verruculosis distincta. Ascosporae (7–)9–11(–14) x (2.5–)3–3.5(–4) µm.

Perithecia (not known from nature) formed heterothallically in vitro, disposed solitarily or in groups of up to six, developing directly on the agar surface or on sterile pieces of beach wood or pine needles, ovoid to obpyriform, with a flattened apex, up to 70 µm wide, orange to red, becoming purple-red in 3 % KOH (positive colour reaction), smooth to warted, up to 300 µm diam and high; with minute stroma of dark red pseudoparenchymatous cells; perithecial wall consisting of two regions; outer region 15–30 µm thick, composed of 1–3 layers of angular to subglobose cells, 10–25 x 8–17 µm; cell walls up to 1 µm thick; inner region 10–15 µm thick, composed of cells that are flat in transverse optical section and angular to oval in subsurface optical face view, 7–15 x 3–5 µm; perithecial warts consisting of globose to subglobose cells, 15–30 x 15–20 µm in surface view. Asci narrowly clavate to cylindrical, 45–60 x 5–6 µm, 8-spored; apex subtruncate, with a minutely visible ring. Ascospores medianly 1-septate, ellipsoidal to oblong ellipsoidal, somewhat tapering towards both ends, smooth to finely warted, hyaline, become pale brown with age, (7–)9–11(–14) x (2.5–)3–3.5(–4) µm.

Conidiophores simple or complex, sporodochial. Simple conidiophores arising laterally or terminally from the aerial mycelium or erect, arising from the agar surface, solitary to loosely aggregated, unbranched or sparsely branched, 1–6-septate, rarely consisting only of the phialide, 40–160 µm long; phialides monophialidic, cylindrical, 20–40 x 3–4 µm, 2–2.5 µm near the aperture. Sporodochial conidiophores aggregated in pionnote sporodochia, irregularly branched; phialides cylindrical, mostly widest near the base, 15–30 x 2.5–3.5 µm, 2–2.5 µm wide near the aperture. Micro- and macroconidia present on both types of conidiophores. Macroconidia predominating, formed by both types of conidiophores, predominantly (1–)3-septate, straight or sometimes slightly curved, cylindrical, mostly with a visible, basal or slightly laterally displaced hilum; 3-septate macroconidia, (24–)35–40(–55) x (4.5–)5.5–6(–6.5) µm (n = 116). Microconidia sparsely produced on all media, 0–1-septate, ellipsoidal to subcylindrical to ovoid, more or less straight, with a minutely or clearly visible lateral hilum; aseptate subcylindrical to ellipsoidal microconidia, 5–15 x 2.5–4 µm; aseptate ovoid microconidia, 3–5 x 3–4 µm, formed predominently on dense, penicillately branched conidiophores on CLA and twigs, and then also without subcylindrical to ellipsoidal microconidia; occurring on other media as a mixture with ovoid microconidia. Conidia formed in heads on simple conidiophores, as hyaline masses on simple as well as complex conidiophores. Chlamydospores common, medium brown, ovoid to ellipsoid, mostly in short, intercalary chains, 10–20 x 10–17 µm.

Specimens of Neonectria liriodendri examined obtained from crossings: CBS H-17776, heterothallic mating of CBS 117527 x CBS 112596, holotype of Neonectria liriodendri; CBS H-17781, mating of CBS 117526 x CBS 117527; CBS H-17780, mating of CBS 117527 x CBS 110.81; CBS H-17779, mating of CBS 117527 x CBS 112596; CBS H-17778, mating of CBS 117527 x CBS 112602; CBS H-17777, mating of CBS 117527 x CBS 112610.

Strains examined: Portugal, Vitis vinifera, coll./isol. C. Rego, CBS 117526, 117527. France, from Vitis vinifera, coll./isol. P. Larignon, CBS 112591, 112610. South Africa, from Vitis vinifera, coll./isol. F. Halleen (CBS 112596, 112602). U.S.A., California, from Liriodendron tulipifera, CBS 110.81, ex-type strain of Cylindrocarpon liriodendri.

Cultural characteristics: Colonies on PDA (surface and reverse) cinnamon to sepia, with sparse aerial mycelium. On OA dark brick to fawn (surface and reverse). Minimum temperature for growth < 4 °C; optimum temperature 20–25 °C, at which PDA colonies reach 30–42 mm diam after 7 d in the dark; maximum temperature between 30–35 °C. Yellow pigmentation not observed.

Host range and distribution: Vitis vinifera (France, Portugal, New Zealand, South Africa), Cyclamen sp. (The Netherlands), Liriodendron tulipifera (U.S.A., California).

Habitat: Typically isolated from roots and rootstocks of grapevines, causing black foot disease. The ex-type culture was obtained from Liriodendron tulipifera in California, where it caused root rot, while another was associated with bulb rot of a Cyclamen sp. in the Netherlands.

Phylogenetic affinity: Nectriaceae, Hypocreales.

	DISCUSSION

TOP Abstract INTRODUCTION MATERIALS AND METHODS RESULTS DISCUSSION References

 
Species of Cylindrocarpon Wollenw. are commonly isolated from soil and regarded to be saprobes or weak pathogens of a wide range of herbaceous and woody plants (Brayford 1993). Since C. destructans was first reported from grapevine in France in 1961, it has been recognised as a pathogen of grapevines cultivated in various countries of different continents (Sweetingham 1983, Grasso 1984, Rego 1994, Fourie et al. 2000, Gugino and Travis, 2003). In a recent taxonomic study revising Cylindrocarpon spp. associated with grapevines, the primary organism causing the black foot disease was identified as C. destructans (Halleen et al. 2004). Halleen et al. (2004) also described a species now known as C. macrodidymum. Although difficult to prove, it is likely that strains pathogenic to grapevine roots but in older literature identified as C. obtusisporum (Grasso & Magnano di San Lio 1975, Scheck et al. 1998) belong to this species. Furthermore, two Cylindrocarpon-like species were removed from Cylindrocarpon and classified as Campylocarpon (Halleen et al. 2004). Although all four species have been found to cause disease on grapevines, C. destructans proved to be the species most commonly isolated from diseased vines, and could possibly be more important than the other pathogens in this disease complex. Further research is currently underway, however, to investigate this aspect.

Several pathogenicity studies have previously been conducted with isolates from the "C. destructans" clade. Oliveira et al. (1998) inoculated rooted cuttings of the grapevine cultivar Seara Nova by dipping the roots in a spore suspension of "C. destructans" (Cy1 = CBS 117640). Typical black foot disease symptoms were observed within 60 d. Similar results were obtained when rooted cuttings of `99Richter' rootstock were inoculated with 12 "C. destructans" isolates, two of which were Cy 68 (CBS 117526) and Cy 76 (CBS 117527). Inoculation significantly reduced plant height and the number of roots, whilst isolate CBS 117526 was considered to be one of the most virulent isolates evaluated (Rego et al. 2001). Inoculation of 6-mo-old potted grapevine rootstocks (cv. Ramsey) with isolate CBS 112597 resulted in death of 27.5 % of the plants 60 d after inoculation, whilst the remaining plants suffered a dramatic reduction in root and shoot mass (Halleen et al. 2004).

Cylindrocarpon liriodendri was first associated with root rot of tulip poplar (Liriodendron tulipifera) in California. Affected plants appeared severely stunted and the root systems were covered with black, dry, scabby lesions that completely girdled or rotted off distal portions of some roots (MacDonald & Butler 1981). MacDonald & Butler (1981) reported that C. liriodendri does not form microconidia. Therefore, it was accepted to not be part of the C. destructans-complex. Our observations are contrasting those of MacDonald & Butler (1981) because the ex-type strain (CBS 110.81) did form microconidia; also, sequences of CBS 110.81 were identical to other isolates from vines (formerly identified as C. destructans) that also formed microconidia in culture. If the C. destructans isolates occurring on grapevines were in fact C. liriodendri, this raised the question as to the identity of Neon. radicicola and its purported anamorph, C. destructans, and the originally described C. radicicola Wollenw. Neonectria radicicola was originally described from rotting bulbs of Cyclamen persicum collected in Sweden, of which an ex-type culture was available for study (CBS 264.65) (Gerlach & Nilsson 1963). The anamorph linked to this species is C. destructans, which Booth (1966) based on a North American neotype from Kentucky, collected on Panax ginseng (CUP 11985), for which there is no culture available. In a recent study, Seifert et al. (2003) showed that there was more than one C. destructans-like species on Panax. Here it is shown that none of these clades are identical to the ex-type strains of Neon. radicicola or C. liriodendri. Cylindrocarpon liriodendri is a name available for the grapevine pathogen, which clusters in its own well supported clade, for which the name Neon. liriodendri is introduced to accommodate its teleomorph.

To fully resolve the taxonomic status of the species present in the C. destructans species complex, however, detailed mating studies with all clades in this complex, and additional sequence data of other loci need to be generated. This work is currently in progress and will be reported on in future studies.

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