Genomic heterogeneity in Pea seed-borne mosaic virus isolates from Pakistan, the centre of diversity of the host species, Pisum sativum

2001 ◽  
Vol 146 (10) ◽  
pp. 1855-1870 ◽  
Author(s):  
A. Ali ◽  
J. W. Randles





1979 ◽  
Vol 59 (1) ◽  
pp. 171-175 ◽  
Author(s):  
S. T. ALI-KHAN ◽  
R. C. ZIMMER

Pea seed-borne mosaic virus (PSbMV) was first identified in Canadian field pea (Pisum sativum L.) breeding lines in 1974. Since then, an extensive program has been underway to eradicate this virus from the breeding lines. At the Morden Research Station, nearly 2000 breeding lines were evaluated. The virus was assayed by infectivity tests using the local lesion host Chenopodium amaranticolor, and by a gel immunodiffusion test. PSbMV was detected in 1361 lines. The level of infection within lines varied from 1 to 3%. Due to the restricted extent of the virus in the breeding lines, it was possible to continue the breeding program without a serious loss in germplasm.



2017 ◽  
Vol 153 ◽  
pp. 78-88 ◽  
Author(s):  
Hana Cerna ◽  
Martin Černý ◽  
Hana Habánová ◽  
Dana Šafářová ◽  
Kifah Abushamsiya ◽  
...  


1993 ◽  
Vol 85 (5) ◽  
pp. 609-615 ◽  
Author(s):  
G. M. Timmerman ◽  
T. J. Frew ◽  
A. L. Miller ◽  
N. F. Weeden ◽  
W. A. Jermyn


1991 ◽  
Vol 42 (3) ◽  
pp. 441 ◽  
Author(s):  
JS Ligat ◽  
D Cartwright ◽  
JW Randles

Five isolates of pea seed-borne mosaic virus (US, S4, S6, Q and T) were compared by host range and symptomatology on 16 Pisum sativum cultivars and lines, 21 lines of Lathyrus and Lens spp. and several indicator species. All selections of Pisum sativum, except cv. Greenfeast, were susceptible to all isolates, but Greenfeast was susceptible to the US isolate. All isolates except T infected the Lathyrus and Lens spp. through mechanical and aphid transmissions. Chenopodium amaranticolor and Vicia faba reacted similarly to all isolates, Phaseolus vulgaris cv. Hawkesbury Wonder reacted to none. The North American isolate (US) was distinguished from the Australian S4, S6, Q, and T isolates by infecting Nicotiana clevelandii and Greenfeast pea. In all cases the highest rate of seed transmission occurred in the largest seed (82-91%) and the lowest was in the smallest seed (27-40%). Infected seed in the largest size classes was lighter in weight than the corresponding uninfected seed. Infected seed in all classes had a significantly lower germination rate than uninfected seed although the greatest reduction in germinability was in the smallest seed. In each size class uninfected seed was heavier than infected seed and germinated better. Two-dimensional immunodiffusion tests showed that precipitin lines between all the isolates and either the US and S6 antisera were confluent with no evidence of spurs. A rapid and sensitive indirect dot-immunobinding assay on nitrocellulose membrane for PSbMV was developed in which non-specific reactions were eliminated by using mannose and glucose in buffers, and healthy plant sap as a blocking agent. The limit of detection of antigen was about 32 ng per sample. Both of the antisera detected antigen in sap extracted from peas infected with the 6 PSbMV isolates, originating from the USA, Australia, New Zealand and Denmark and all isolates were detected at similar antiserum dilution endpoints.



1981 ◽  
Vol 87 (1) ◽  
pp. 1-10 ◽  
Author(s):  
R. Hampton ◽  
G. Mink ◽  
L. Bos ◽  
T. Inouye ◽  
M. Musil ◽  
...  
Keyword(s):  




2019 ◽  
Vol 55 (No. 3) ◽  
pp. 167-171
Author(s):  
Milan Navrátil ◽  
Dana Šafářová

Whole genome sequences of three Czech Pea seed-borne mosaic virus isolates belonging to P1 pathotype and causing different symptom intensity were obtained. Using RDP4 analysis the natural recombinant isolate PSB204CZ bearing two breakpoints in nucleotide positions 4053 and 6080 was identified. The isolate was composed of fragment 2028 nt in length partially covering CI and 6K2 regions of the minor parent (PSB262CZ) incorporated into the major parent (PSB194CZ). The results suggest that the observed recombination in CI-6K2 region is responsible for severity of developed symptoms. This observation detected for the first time natural recombination within PSbMV isolates of an important pathogen of leguminous plants.



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