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Titolo:
NATIONAL SURVEY OF VIRUSES IN PASTURES OF SUBTERRANEAN CLOVER .1. INCIDENCE OF 4 VIRUSES ASSESSED BY ELISA
Autore:
HELMS K; MULLER WJ; WATERHOUSE PM;
Indirizzi:
CSIRO,DIV PLANT IND,GPO BOX 1600 CANBERRA ACT 2601 AUSTRALIA CSIRO,INST NAT RESOURCES & ENVIRONM,BIOMETR UNIT CANBERRA ACT 2601 AUSTRALIA
Titolo Testata:
Australian Journal of Agricultural Research
fascicolo: 8, volume: 44, anno: 1993,
pagine: 1837 - 1862
SICI:
0004-9409(1993)44:8<1837:NSOVIP>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
LINKED IMMUNOSORBENT-ASSAY; YELLOW MOSAIC-VIRUS; FORAGE LEGUMES; DISEASES; AUSTRALIA;
Keywords:
VIRUS INCIDENCE; MULTIPLE INFECTIONS; PASTURES; SUBTERRANEAN CLOVER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
47
Recensione:
Indirizzi per estratti:
Citazione:
K. Helms et al., "NATIONAL SURVEY OF VIRUSES IN PASTURES OF SUBTERRANEAN CLOVER .1. INCIDENCE OF 4 VIRUSES ASSESSED BY ELISA", Australian Journal of Agricultural Research, 44(8), 1993, pp. 1837-1862

Abstract

A nationwide survey was made of the time-course incidence of alfalfa mosaic virus (AMV), clover yellow vein virus (CYVV), subterranean clover mottle virus (SCMoV) and subterranean clover red leaf virus (SCRLV)in improved pastures in southern regions of Australia over a 3-year period. Up to 2 500 samples (cvv. Mt Barker or Woogenellup) were collected in winter and spring of 1984, 1985 and 1986 in each of New South Wales, Victoria, South Australia, Western Australia and Tasmania, and assayed by ELISA. Usually, each sample consisted of one or two plants or parts thereof. However, a small number of samples in winter contained parts of up to 10 seedlings. For this reason, incidences are expressed as percentage of infected samples rather than percentages of infected plants. All four viruses occurred in all five states. Averaged overall states, the incidence of infected samples increased progressivelyfrom 15.3 to 19.9 to 22.5% from 1984 to 1985 to 1986, respectively, in spring, and from 6.8 to 13.8 to 18.8% respectively in winter. The incidence of samples infected with multiple infections (2-4 viruses) increased from 1.9 to 3.2 to 5.0% from 1984 to 1985 to 1986, respectively, in spring, and from 0.5 to 1.6 to 4.0%, respectively, in winter. Since 1-4 viruses were detected in each infected sample, more individual infections than infected samples were recorded. For example, the incidence of virus infections per paddock increased progressively from 17.5to 24.1 to 28.6% from 1984 to 1985 to 1986, respectively, in spring. On a state basis, the incidence of infected samples was greatest in W.A., reaching 38.9 and 34.9% in spring of 1985 and 1986, respectively, and in S.A. reaching 30.3% in spring of 1986; these high levels were due largely to SCMoV which reached 97% in one paddock in each of the two states. In N.S.W., Vic. and Tas., the highest incidences of infectedsamples in either winter or spring were 21.4, 16.2 and 23.1%, respectively. Averaged over all states, the highest mean incidence recorded for samples infected with individual viruses in either winter or springwas 9.4% for AMV, 5.7% for CYVV, 10.9% for SCMoV and 7.5% for SCRLV. For AMV and SCRLV, there was an increasing trend from spring 1984 to spring 1986. A similar increasing trend for SCMoV was more evident in winter than in spring. For CYVV, no time-course pattern was evident. These results support the proposition that viruses contribute significantly to 'clover-decline', a well-known problem in pastures of subterranean clover.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 22:10:59