scholarly journals Mature plant resistance of potato against some virus diseases. III. Mature plant resistance against potato virus YN, indicated by decrease in ribosome-content in ageing potato plants under field conditions

1981 ◽  
Vol 87 (1) ◽  
pp. 30-30
Author(s):  
J. H. Venekamp ◽  
A. Schepers ◽  
C. B. Bus
Keyword(s):  
Potato Virus ◽  
Plant Resistance ◽  
Field Conditions ◽  
Mature Plant ◽  
Virus Diseases ◽  
Mature Plant Resistance ◽  
Potato Plants

scholarly journals Response of Brassica oleracea var. capitata to Wound and Spray Inoculations with Xanthomonas campestris pv. campestris

HortScience ◽  
2005 ◽  
Vol 40 (1) ◽  
pp. 47-49 ◽  
Author(s):  
Phillip D. Griffiths ◽  
Cathy Roe
Keyword(s):  
Brassica Oleracea ◽  
Plant Resistance ◽  
Xanthomonas Campestris ◽  
Field Experiments ◽  
Field Resistance ◽  
Mature Plant ◽  
Black Rot ◽  
Mature Plant Resistance ◽  
Breeding Lines ◽  
Spray Inoculation

Eighteen cabbage breeding lines and cultivars were evaluated for resistance to black rot caused by Xanthomonas campestris pv. campestris following wound and spray inoculations at the juvenile and mature stages. Plants were evaluated using four inoculation procedures (juvenile wound, juvenile spray, mature wound, and mature spray) in replicated greenhouse and field experiments. The breeding lines Badger #16, Cornell 101, Cornell 102, NY 4002 and accession PI 426606 exhibited high levels of resistance following all inoculation procedures. `Silver Dynasty' was the most resistant commercial cultivar based on the four tests, yet ranked 12th following the juvenile wound inoculation. The juvenile spray inoculation had a high correlation with both wound and spray inoculations in field experiments (0.89 and 0.86, respectively); however, the juvenile wound inoculation did not correlate well with mature wound and spray inoculations (0.58 and 0.51, respectively). The results indicate that the juvenile wound inoculation is not the most appropriate approach for determining field resistance in Brassica oleracea, and that resistant material could be selected against using this approach. A high correlation between juvenile spray inoculation disease severity ratings and mature plant resistance indicates that plants can be evaluated effectively at the juvenile stage for mature plant resistance to black rot.

Investigations in the Triticinae IV. Disease reactions of species of Triticum and Aegilops and of amphidiploids between them

1955 ◽  
Vol 46 (2) ◽  
pp. 232-246 ◽  
Author(s):  
G. D. H. Bell ◽  
F. G. H. Lupton
Keyword(s):  
Plant Resistance ◽  
Triticum Monococcum ◽  
Mature Plant ◽  
Field Observations ◽  
Wheat Species ◽  
Sources Of Resistance ◽  
Seedling Resistance ◽  
Mature Plant Resistance ◽  
Numerous Species ◽  
Aegilops Caudata

1. Observations have been made of the seedling reactions of species of Triticum and Aegilops and of amphidiploids between them to races of Puccinia glumarum, P. triticina, P. graminis and Erysiphe graminis. These observations have been compared with field observations on mature plants. The work on P. graminis and much of that on P. triticina was carried out by Dr R. C. McGinnis of the Dominion Rust Research Laboratories, Winnipeg, Canada.2. Seedling and mature plant resistance to P. glumarum has been found in Triticum monococcum, Aegilops caudata and A. ovata. Resistance was not shown by amphidiploids of T. monococcum and A. caudata with susceptible species of Triticum, but was shown by some amphidiploids involving A. ovata; T. timopheevi and A. speltoides were susceptible to certain races as seedlings but resistant as mature plants in the field.3. Seedling resistance to all the races of P. triticina used in these investigations was shown by A. caudata and resistance to certain races by certain other species. Amphidiploids involving A. caudata were resistant to all races, but other amphidiploids were resistant to some races and susceptible to others.4. Seedling and mature plant resistance to P. graminis was shown by A. caudata. A. ovata and A. speltoides were resistant as mature plants, and only slightly infected as seedlings. None of the amphidiploids tested was completely resistant at the seedling stage; certain amphidiploids involving these three species were, however, only slightly infected as mature plants, and may be useful as sources of resistance to race 15B.5. Resistance to E. graminis was shown by T. carthlicum, T. dicoccum, T. timopheevi and by numerous species of Aegilops. Amphidiploids of T. carthlicum, T. dicoccum, T. timopheevi and A. caudata with diploid wheat species were resistant to E. graminis, but those with susceptible tetraploid wheats were susceptible. Other intergeneric amphidiploids (with two exceptions) were resistant.

scholarly journals Resistance of genetically modified potatoes to Potato virus Y under field conditions

2009 ◽  
Vol 44 (9) ◽  
pp. 1127-1130 ◽  
Author(s):  
André Nepomuceno Dusi ◽  
Cristiane Lopes de Oliveira ◽  
Paulo Eduardo de Melo ◽  
Antonio Carlos Torres
Keyword(s):  
Potato Virus ◽  
Potato Virus Y ◽  
Protein Gene ◽  
Genetically Modified ◽  
Growth Cycle ◽  
Field Conditions ◽  
Potato Plants ◽  
The Third ◽  
Genetically Modified Potatoes ◽  
Das Elisa

The objective of this work was to evaluate the resistance of genetically modified clones of potato to Potato virus Y (PVY) under field conditions. Genetically modified plants were compared with nontransformed plants of the same cultivar. The plots were flanked with potato plants infected with both PVYº and PVY N strains (spread lines), in order to provide the experimental area with the source of virus, which was naturally spread by the native aphid population. The experiment was weekly monitored by visual inspections and by DAS-Elisa in the plants produced from the harvested tubers, in order to evaluate the resistance of transgenic plants throughout the plant growth cycle. By the end of the third year, no infection symptoms were observed in the 1P clone; clone 63P showed 1% of infection, in contrast to about 90% of nontransformed plants infected. The stable expression of resistance to PVY provided by the coat protein gene was obtained in genetically modified clones of potato plants cultivar Achat under field conditions, during three consecutive years.

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