Abstract
Abstract Seedlings of a great number of Malus species, subspecies, cultivars and hybrids were graft‐inoculated with the apple proliferation MLO. The scion cultivars were M. pumila cv.‘Cox's Orange Pippin’and‘Golden Delicious’. The grafted trees responded very differently to infection. According to recovery rate, witches’broom formation, mortality, and development of the MLO population, the tested material could be divided into 5 groups. Group I corresponds to the domestic apple M. pumila and is characterized by a low recovery rate, a low mortality, a high frequency of witches’broom formation, and a high MLO titer. Group II differs from group I mainly by a higher mortality. In group III, mortality is like in group II but recovery is higher while witches’broom formation and MLO titer are significantly lower. Group IV is characterized by a mortality of more than 50 %. Both witches’broom formation and the numbers of MLOs in the phloem are usually low. In group V, most of the trees recovered or showed never symptoms while mortality was low. After inoculation the MLO population was low or appeared degenerate. During recovery the number of MLO‐positive samples decrease so that by the end of the observation period the organisms could not longer be detected in most cases. Group V consists of apomictic rootstock selections deriving from crosses of M. sieboldii and M. sargentii with M. pumila . Due to the combination of low mortality with the apparent elimination of the MLOs within a few years this group fulfills the requirement of resistant rootstocks suitable for controlling apple proliferation.
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Claims 12
Claim · model-written summary
Grafted Malus trees differed in response to apple proliferation infection.
- Outcome
- responded very differently to infectione0
MalusNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The grafted trees responded very differently to infection”
t0“Malus Taxa and Hybrids”
Claim · model-written summary
The tested material was divided into five groups by recovery, witches broom, mortality and MLO population.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“According to recovery rate, witches’broom formation, mortality, and development of the MLO population, the tested material could be divided into 5 groups”
t0“Malus Taxa and Hybrids”
Claim · model-written summary
Group I domestic apple had low recovery and mortality, frequent witches broom, and high MLO titer.
- Taxon
- M. pumila
Malus pumilae0 - Material
- Group Ie0
- Interactor
- MLOe0pathogen
- Outcome
- low recovery rate, a low mortality, a high frequency of witches’broom formation, and a high MLO titere0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Group I corresponds to the domestic apple M. pumila and is characterized by a low recovery rate, a low mortality, a high frequency of witches’broom formation, and a high MLO titer”
Claim · model-written summary
Group II had higher mortality than group I.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Group II differs from group I mainly by a higher mortality”
t0“Malus Taxa and Hybrids”
Claim · model-written summary
Group III mortality resembled group II while recovery was higher and witches broom and MLO titer were significantly lower.
- Material
- group IIIe0
- Interactor
- MLOe0pathogen
- Outcome
- mortality is like in group II but recovery is higher while witches’broom formation and MLO titer are significantly lowere0
- Comparator
- group IIe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In group III, mortality is like in group II but recovery is higher while witches’broom formation and MLO titer are significantly lower”
t0“Malus Taxa and Hybrids”
Claim · model-written summary
Group IV mortality exceeded 50%.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Group IV is characterized by a mortality of more than 50 %”
t0“Malus Taxa and Hybrids”
Claim · model-written summary
Group IV usually had low witches broom formation and MLO numbers in phloem.
- Material
- Group IVe1
- Interactor
- MLOs
Candidatus Phytoplasmae0pathogen - Outcome
- witches’broom formation and the numbers of MLOs in the phloeme0
- Direction
- lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both witches’broom formation and the numbers of MLOs in the phloem are usually low”
e1“Group IV is characterized by a mortality of more than 50 %”
t0“Malus Taxa and Hybrids”
Claim · model-written summary
Most group V trees recovered or never showed symptoms and had low mortality.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In group V, most of the trees recovered or showed never symptoms while mortality was low”
t0“Malus Taxa and Hybrids”
Claim · model-written summary
After inoculation, group V MLO populations were low or degenerate.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After inoculation the MLO population was low or appeared degenerate”
e1“In group V, most of the trees recovered”
t0“Malus Taxa and Hybrids”
Claim · model-written summary
MLO-positive samples decreased during recovery until the organism was undetectable in most cases.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During recovery the number of MLO‐positive samples decrease so that by the end of the observation period the organisms could not longer be detected in most cases”
t0“Malus Taxa and Hybrids”
Claim · model-written summary
Group V came from apomictic rootstock selections crossing M. sieboldii and M. sargentii with M. pumila.
- Taxon
- M. sieboldii and M. sargentii with M. pumila
Malus sargentii
Malus sieboldiie0 - Material
- Group Ve0
- Outcome
- apomictic rootstock selectionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Group V consists of apomictic rootstock selections deriving from crosses of M. sieboldii and M. sargentii with M. pumila”
Claim · model-written summary
The authors judged group V suitable as resistant rootstocks for controlling apple proliferation.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this group fulfills the requirement of resistant rootstocks suitable for controlling apple proliferation”
e1“Group V consists of apomictic rootstock selections”
t0“Malus Taxa and Hybrids”