Abstract
Comparisons were made of the host ranges, interactions in infected plants, and effects on yields of cereals of two isolates of barley yellow‐dwarf virus, one avirulent, RV, obtained from Rothamsted farm (Watson & Mulligan, 1956) and the other virulent, KV, obtained from Kent. They resembled each other and the American yellow‐dwarf viruses in their ability to infect wild grasses but differences were found when the infection tests were made using inbred lines of the same grass species. KV infected one variety each of rice, rye and maize, and caused symptoms in each. When plants were first infected with RV and later, when symptoms had fully developed, with KV, they suffered the same loss of yield from KV as did plants infected for the same length of time with KV alone. Therefore plants infected with RV were not protected against infection with KV. Similarly, aphids ( Rhopalosiphum padi L.), fed first on sources of RV and then on KV, transmitted mainly KV so there was no evidence of protection in the insect vectors. Effects on yield of cereals were related to the time of appearance and intensity of symptoms. The effect of RV was not only less than that of KV but was also more variable.
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Claims 10
Claim · model-written summary
The two isolates both infected wild grasses.
Verbatim
e0“They resembled each other and the American yellow‐dwarf viruses in their ability to infect wild grasses”
Claim · model-written summary
Inbred lines of the same grass species differed in infection tests.
Verbatim
e0“differences were found when the infection tests were made using inbred lines of the same grass species”
Claim · model-written summary
KV infected a rice variety and caused symptoms.
- Taxon
- rice
Oryza sativae0 - Interactor
- KVAlphanudivirus dromelanogasterise0
- Outcome
- caused symptomse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“KV infected one variety each of rice, rye and maize, and caused symptoms in each”
Claim · model-written summary
KV infected a rye variety and caused symptoms.
- Taxon
- rye
Secale cerealee0 - Interactor
- KVAlphanudivirus dromelanogasterise0
- Outcome
- caused symptomse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“KV infected one variety each of rice, rye and maize, and caused symptoms in each”
Claim · model-written summary
KV infected a maize variety and caused symptoms.
- Interactor
- KVAlphanudivirus dromelanogasterise0
- Outcome
- caused symptomse0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“KV infected one variety each of rice, rye and maize, and caused symptoms in each”
Claim · model-written summary
Prior RV infection did not protect plants from KV yield loss.
- Taxon
- plantsViridiplantaee0
- Treatment
- first infected with RV and later, when symptoms had fully developed, with KVe0
- Interactor
- KVAlphanudivirus dromelanogasterise0
- Outcome
- loss of yielde0
- Direction
- samee0
- Comparator
- KV alonee0
Verbatim
e0“When plants were first infected with RV and later, when symptoms had fully developed, with KV, they suffered the same loss of yield from KV as did plants infected for the same length of time with KV alone”
Claim · model-written summary
Aphids exposed to RV then KV transmitted mainly KV.
- Taxon
- BARLEY
.jpg?width=60)
Hordeum vulgaret0 - Interactor
- Rhopalosiphum padi L.
_Figure_1_a.jpg?width=60)
Rhopalosiphum padie0 - Outcome
- transmitted mainly KVe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
_Figure_1_a.jpg?width=500)
Verbatim
e0“aphids ( Rhopalosiphum padi L.), fed first on sources of RV and then on KV, transmitted mainly KV”
t0“BARLEY”
Claim · model-written summary
Cereal yield effects were related to symptom timing and intensity.
Not reportedOrgan / stageDirection
Verbatim
e0“Effects on yield of cereals were related to the time of appearance and intensity of symptoms”
Claim · model-written summary
RV had a smaller yield effect than KV.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of RV was not only less than that of KV but was also more variable”
t0“BARLEY”
Claim · model-written summary
The effect of RV was more variable than that of KV.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of RV was not only less than that of KV but was also more variable”
t0“BARLEY”