Abstract
With the exception of chlorotic streaks in a few plants, a severe strain of barley yellow dwarf virus (BYDV) transmitted by Rhopalosiplum padi caused no obvious foliar symptoms in 54 varieties of ryegrass when they were defoliated monthly. When defoliation ceased and yellow or red discoloration of the leaf tips was allowed to develop, it was a poor indicator of the seventy of disease effect on yield. Thus, some varieties which developed marked discoloration were less severely damaged than some with little or none While BYDV induced yield significant in some varieties of ryegrass, it increased it significantly in others. In some varieties these BYDV‐induced yield increases occurred throughout the year, but in others they occurred in 1 month and were offset by a yield decrease in another. BYDV infection caused a greater yield reduction in roots than in shoots. Even varieties giving increased shoot yield gave decreased root yield. The possible disadvantages of the resulting increase in shoot to root ratio are discussed. It is concluded that breeding ryegrass for BYDV‐induced yield increases may be easier and more rewarding than breeding for resistance or tolerance.
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Claims 10
Claim · model-written summary
BYDV produced few visible foliar symptoms under monthly defoliation.
- Material
- 54 varieties of ryegrasse0
- Treatment
- barley yellow dwarf virus (BYDV)e0
- Interactor
- barley yellow dwarf virus
Barley yellow dwarf viruse0pathogen - Outcome
- foliar symptomse0
- Direction
- no obviouse0
LoliumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a severe strain of barley yellow dwarf virus (BYDV) transmitted by Rhopalosiplum padi caused no obvious foliar symptoms in 54 varieties of ryegrass when they were defoliated monthly”
e1“54 varieties of ryegrass”
Claim · model-written summary
Leaf tip discoloration poorly indicated yield damage after defoliation ceased.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yellow or red discoloration of the leaf tips was allowed to develop, it was a poor indicator of the seventy of disease effect on yield”
e1“54 varieties of ryegrass”
Claim · model-written summary
Some varieties with strong discoloration were less damaged than some with little or none.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“some varieties which developed marked discoloration were less severely damaged than some with little or none”
e1“54 varieties of ryegrass”
Claim · model-written summary
BYDV significantly reduced yield in some ryegrass varieties.
- Material
- some varieties of ryegrasse0
- Treatment
- BYDVe0
- Interactor
- BYDVBarley yellow dwarf viruse0pathogen
- Outcome
- yielde0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BYDV induced yield significant in some varieties of ryegrass, it increased it significantly in others”
e1“54 varieties of ryegrass”
Claim · model-written summary
BYDV significantly increased yield in other varieties.
- Treatment
- BYDVe0
- Interactor
- BYDVBarley yellow dwarf viruse0pathogen
- Outcome
- yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“While BYDV induced yield significant in some varieties of ryegrass, it increased it significantly in others”
e1“54 varieties of ryegrass”
Claim · model-written summary
In some varieties, BYDV induced yield gains persisted all year.
- Interactor
- BYDVBarley yellow dwarf viruse0pathogen
- Outcome
- yield increasese0
- Direction
- increasese0
- Qualifier
- throughout the yeare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In some varieties these BYDV‐induced yield increases occurred throughout the year”
e1“54 varieties of ryegrass”
Claim · model-written summary
In other varieties, a one month yield increase was offset by a decrease in another month.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in others they occurred in 1 month and were offset by a yield decrease in another”
e1“54 varieties of ryegrass”
Claim · model-written summary
BYDV reduced root yield more than shoot yield.
- Organ / stage
- rootse0
- Treatment
- BYDV infectione0
- Interactor
- BYDVBarley yellow dwarf viruse0pathogen
- Outcome
- yield reduction in rootse0
- Direction
- greatere0
- Comparator
- shootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“BYDV infection caused a greater yield reduction in roots than in shoots”
e1“54 varieties of ryegrass”
Claim · model-written summary
Varieties with increased shoot yield still had decreased root yield.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Even varieties giving increased shoot yield gave decreased root yield”
e1“54 varieties of ryegrass”
Claim · model-written summary
The authors recommend breeding for BYDV induced yield gains.
- Outcome
- breeding ryegrass for BYDV‐induced yield increasese0
- Comparator
- breeding for resistance or tolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“breeding ryegrass for BYDV‐induced yield increases may be easier and more rewarding than breeding for resistance or tolerance”
e1“54 varieties of ryegrass”