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Transmission of Virus by the Progeny of Crosses Between Xiphinema Diversicaudatum

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Transmission of Virus by the Progeny of Crosses Between Xiphinema Diversicaudatum Transmission of virus by the progeny of crosses between XQhinema diversicaudatüm (Nematoda : Dorylaimoidea) from Italy and Scotland Derek J. F. BROWN Scottish Crop Research Institute, Invergowrie, Dundee, 002 SDA, Scotland. SUMMARY Transmission of the type-British strainsof arabis mosaic (AMV-T) and strawberry latent ringspot viruses (SLRV-T) and a strain of SLRV from Italy (SLRV-Ip) by FI and F2 hybrid Xiphinenza diversicaudatum was examined in the laboratory. The hybrid nematodes were crossbred from populations which readily (Scotland) and only infrequently (Italy) transmitted viruses.The ability of X. diversicaudatum hybrids to transmit viruses was foundto be inherited withthe choice of both maternaland paternal parents affecting the hybrids ability to transmit viruses. It is possible that the genetic influence on the hybrids ability to transmit viruses was cytoplasmically inherited. The principal factor likely to be involved is the ability of X. di ver sic au da tu??^ selectively and specifically to retain virus particles at sites of retention within its feeding apparatus. RBSUME La transnzission des virus par la descendance de croiselnents entre Xiphjnema diversicaudatum (Nernatoda :Do ylainzoidea) provenantd’ltalie et d’Ecosse La transmission de souches de type britannique des virus de la mosaïque arabis (AMV-T), du virus du G ringspot n latent du fraisier (SLRV-T)et d’une souchede SLRV provenant d‘Italie (SLRV-Ip) par des hybridesFI et F2 de Xiphinewa diversicaudatuwz .a été Ctudiée au laboratoire. Les nématodes hybrides étaient obtenus par croisements entre populations qui transmettent les virus soit activement (Ecosse), soit seulement occasionnellement (Italie). La capacité de transmission des virus montrée par les X. diversicaudatunz hybrides est héritée suivant le choix des parents maternel et paternel. Il est possible que cette capacite soit héritée cytoplasmiquement, et le facteur principal la concernant paraît être la possibilité pourX. diversicaudatunt de retenir les particules du virus sélectivement et spécifiquement dans les sites spécialisés de l’appareil nutritionnel. 1 In laboratory experiments nineof twelve populations Materials and Methods of Xiphinemadiversicaudatum (Micoletzky, 1927) Thorne, 1939 from different parts of the world were The populations of X. diversicaudatum came from effective vectors of two strains of arabis mosaic (AMV) Dundee,Scotland and the Lombardi region, Italy and the type-British strain of strawberry latent ringspot (Brown & Topham, 1985). Progeny were obtained by the viruses (SLRV-T; Brown, 1985, 1986 a). Populations method described by Brown(1986 b) and came fromsix from France, Italy and Spain transmitted these viruses parental lines, Italianmaternal and paternal (IIPl), infrequently. A strain of SLRV from Italy was trans- Scottish maternal and paternal (SSPl), Italian maternal mitted very infrequently by several populationsbut and Scottishpaternal (ISFl), Scottishmaternal and nematodes from Italy were consistent vectors (Brown, Italian paternal (SIFl), ISFl parentage(ISFZ) and SIFl 1985,1986 a; Brown &Taylor,1981; Brown & Trudgill, parentage (SIF2). 1983). The seroIogically distinguishable strains of virus used were the type-British strains of arabis mosaic (AMV-T; Brown (1986 b) showed that the populations of X. Harrison, 1958) andstrawberry latent ringspot diversicaudatum, including that from Italy, readily in- (SLRV-T; Lister, 1964) and a strain of SLRV isolated terbred with one from Scotland.In this paper theability from Prunus persica L. growingin Italy(SLRV-Ip; of progeny of crosses between the Scottish and Italian Brown & Trudgill, 1983). population to transmit strains of AMV and SLRV are Virus transmission experiments were done in 25 cm3 reported. plastic-pots which were maintained in a humid atmos- Revue Neinatol. 9 (1) : 71-74 (1986) 71 D. J. E Brown phere in a temperature controlledcabinet (Taylor & the bait plants were tested for systemically translocated Brown, 1974) at 18' f 1' and with a minimum day- virus. The identity of the viruses recovered from selected length of 16hr. The proceduraldetails have been C. quinoaassay plants was confirmed serologically. Only published elsewhere (McElroy, Brown & Boag, 1977; those bait plants where the nematodewas recovered on Trudgill & Brown, 1978; Brown & Trudgill, 1983; completion of the bait period were used for compiling TrudGll, Brown & McNamara, 1983). Tables 1, 2 and 3. Petunia hybrida Vilm. was used as the virus-source and as the bait plants for AMV-T; Chenopodium qzdinoa Results Willd. was used with the two strains of SLRV. Groups of 35 virus-free X. diversicaudatum from the Scottish The type-British strain of AMVand SLRV were and the Italian populations, Ca. 50 O/O of the F1 hybrids transmitted by Ca. 70 O/o of the nematodes withScottish recovered fromthe pots inwhich reproduction had parentage (SSP1) but by less than 5 O/O of those with Italian occurred, or al1 of the F2 hybrids recovered from each parentage (IIPl). Hybrid nematodesof both generations pot were given access for four weeks to the virus-source (SIF1, SIFZ, ISFl & ISF2) transmitted AMV-T and plant. The ability of these nematodes to transmit virus SLRV-T with frequencies intermediate to those of the was examinedby transferring one nematode to each SSPl and IIPl nematodes (Tabs.1 and 2). SLRV-Ip was virus-free bait plant. Only juveniles (J3's & J4's) were recovered from only one of 57 and two of 30 bait plants used in the bait test as there were no adult F2 hybrids. exposed to IIPl and ISF2 nematodes respectively and After fourweeks the roots of the baitplants were tested was not recovered from bait plants exposed to SSP1, for the presenceof virus and the aerial parts of some of ISF1, SIFl and SIF2 nematodes (Tab. 3). Table 1 The transmission of the type-British strain of arabis mosaic virus by Xiphinema diversicaudatum from populations from Italy and Scotland and by reciprocally bred FI and F2 hybrids Pl parental, F1 parental and F2 grandparental ancesty Number of Proportion of nematodes transmis,sions* transmitting virus Female Male Pl Pl Italy Italy Italy 0.041 2/49** Scotland Scotland Scotland 0.798 67/84 F1 F2 F1 F2 Italy Scotland Italy 4/25 9/300.300 O. 160 Scotland Italy Scotland0.360 16/29 9/25 0.552 * One nematode per bait plant. ** Numerator is the number of bait plants infected, denominator is the number of plants tested. Table 3 The transmission of the type-British strain of strawberry latent ringspot virus by Xiphinema diversicaudatum from populations from Italy and Scotland and by reciprocally bred FI and F2 hybrids Pl parental, FI parentalNumber of Proportion of nematodes and F2and grandparental ancesty transmissions * transmittingvirus Female Pl Male Pl Italy Italy 1/57** 0.018 Scotland Scotland 54/77 0.701 F1 F2 FI F2 Italy Scotland0.300 5/230.217 9/30 Scotland Italy 012 1 4/27 < 0.048 0.148 * One nematode per bait plant. ** Numerator is the number of bait plants infected, denominator is the number of plants tested. 72 Revue Nématol. 9 (1) : 71-74 (1986) Transmission of virus by crosses of Xiphinema diversicaudatum Table 3 The transmission of a strain of strawberry latent ringspot virus isolated from Prunus persica L. growing in Italy by Xiphinema diversicaudatum from populations from Italy and Scotland and by reciprocally bred FI and F2 hybrids PI parental, FI parentalparental, FI PI Nunzber of Proportion of nematodes and F2 grandparental ancesty transmissions" transnzittingvirus Fentale Male PI P2 Italy Italy 1/57** 0.018 Scotland Scotland 0154 < 0.019 FI F2 F1 F2 Italy Scotland O123 2/30 < 0.043 0.067 Scotland Italy 011 1 0130 < 0.091 < 0.033 * One nematode per bait plant. ** Numerator is the number of bait plants infected, denominator is the number of plants tested. Proportionately, twice as many ISF2 and SIF2 nema- transmit viruses. Brown and Trudgill (1983) reported todestransmitted AMV-T and SLRV-T than did that therelatively infrequent transmission of viruses by ISFland SIFl nematodes. Similarly, twiceas many a populationof X. diversicaudatum from Italy (the same SIFl and SIF2 nematodes transmitted AMV-T than did as used in the present study) was associated with an ISFl and ISF2 nematodes,whereas, the reverse occurred apparent inability by thenematodes to retain virus with SLRV-T with nematodes with these same parent- particles. Harrison,Robertson and Taylor (1974) re- ages. ported that the proteincoat of virus particles was import- ant in thespecific transmissionof viruses by their vector nematodes. Therefore, it seems likely that the method of specific retention of viruses involves some character- Discussion istic of the protein coat of virus particles interacting or responding to some inherited characteristicof the cuticle The results of this study indicate that theability of X. lining the nematodes oesophagus. Carbohydrates, es- diversicaudatum to transmit AMV-T and SLRV-T is pecially sialic acid, gangliosides (charged glyco-lipids; inherited. The ability of hybrid nematodes to transmit Robertson & Wyss, 1983) and " mucus-like " material these viruses is affected by both materna1 and paternal (Taylor & Robertson, 1969, 1970; McGuire,Kim & parentage. The inherited ability of the hybrids to be Douthit, 1970; Robertson & Wyss, 1983) have been virus vectors may, therefore, be contained in the cyto- suggested as possibly being involved inthe specific plasm during fertilization. retention of viruses within nematode virusvectors. The Harrison and Murant(1984) suggested that theability inherent differences in the transmission of SLRV-Ip, of ISFl and ISF2 nematodes to transmit AMV-T and SLRV-T and AMV-T by hybrid X. diversicaudatum SLRV-T is controlled by a single dominant gene. The may be related to differences in the methodsof retention transmission of AMV-T by SIFl and SIF2 nematodes of these viruses within the nematode. do not show any single gene dominance effectswhereas their ability to transmit SLRV-T may be attributed to ACKNOWLEDGEMENTS a single recessive gene. However, the present data are notunequivocal evidence for either single gene or 1 thank Dr.F. Roca, Institut0 di NematologiaAgraria, polygenic controlof the ability of X.diversicaudatum to CNR, Bari, Italy for providing the population of X.
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  • Identification of Some Viruses Causing Mosaic on Lettuce and Characterization of Lettuce Mosaic Virus from Tehran Province in Iran
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