Abstract
The impact of the apple rust mite, Aculus schlechtendali (Nalepa), on net CO 2 exchange, transpiration rate, and leaf color of field-grown Jonagold and Golden Delicious apples was investigated. Apple rust mite feeding causes leaf browning. Changes in leaf color were measured to assess the cumulative leaf damage. Significant negative relationships were found between cumulative leaf damage and single-leaf net CO 2 exchange as well as transpiration rate. The same trends were observed on both varieties, but the effect of apple rust mite feeding was more severe on Jonagold than on Golden Delicious. Leaf tissue injury was analyzed by cryoscanning electron microscopy and light microscopy. The pictures show that apple rust mites penetrate epidermal cells with their stylets, causing multiple puncture wounds. On heavily infested leaves, apple rust mite feeding causes desiccation of the epidermis and the spongy parenchyma. The resulting malfunction of the stomata and problems in gas exchange within the spongy parenchyma are likely to be the main reason for the reduction of gas exchange.
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Claims 6
Claim · model-written summary
Apple rust mite feeding causes leaf browning on apple leaves.
- Taxon
- Apple
Malus domesticat0 - Treatment
- Apple rust mite feedinge1
- Interactor
- apple rust mitee1pest
- Outcome
- leaf browninge1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Apple rust mite feeding causes leaf browning”
t0“Apple Leaf Gas Exchange”
Claim · model-written summary
Cumulative leaf damage from apple rust mite feeding was negatively related to single-leaf net CO 2 exchange and transpiration rate in apple.
- Taxon
- AppleMalus domesticat0
- Treatment
- cumulative leaf damagee1
- Outcome
- single-leaf net CO 2 exchange as well as transpiration ratee1
- Direction
- decreaseinferrede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Significant negative relationships were found between cumulative leaf damage and single-leaf net CO 2 exchange as well as transpiration rate”
t0“Apple Leaf Gas Exchange”
Claim · model-written summary
Apple rust mite feeding had a more severe effect on Jonagold than on Golden Delicious apple.
- Taxon
- AppleMalus domesticat0
- Material
- Jonagolde1
- Treatment
- apple rust mite feedinge1
- Interactor
- apple rust mitee1pest
- Outcome
- effect of apple rust mite feedinge1
- Direction
- more severee1
- Comparator
- Golden Deliciouse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the effect of apple rust mite feeding was more severe on Jonagold than on Golden Delicious”
t0“Apple Leaf Gas Exchange”
Claim · model-written summary
Apple rust mites penetrate epidermal cells of apple leaves with their stylets, causing multiple puncture wounds.
- Taxon
- AppleMalus domesticat0
- Organ / stage
- epidermal cellse1
- Interactor
- apple rust mitese1pest
- Outcome
- penetrate epidermal cellse1
- Qualifier
- with their stylets, causing multiple puncture woundse1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“apple rust mites penetrate epidermal cells with their stylets, causing multiple puncture wounds”
t0“Apple Leaf Gas Exchange”
Claim · model-written summary
On heavily infested apple leaves, apple rust mite feeding causes desiccation of the epidermis and the spongy parenchyma.
- Taxon
- AppleMalus domesticat0
- Organ / stage
- the epidermis and the spongy parenchymae1
- Treatment
- apple rust mite feedinge1
- Interactor
- apple rust mitee1pest
- Outcome
- desiccatione1
- Qualifier
- On heavily infested leavese1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“On heavily infested leaves, apple rust mite feeding causes desiccation of the epidermis and the spongy parenchyma”
t0“Apple Leaf Gas Exchange”
Claim · model-written summary
Stomatal malfunction and gas-exchange problems in the spongy parenchyma are likely the main reason for reduced gas exchange in infested apple leaves.
- Taxon
- AppleMalus domesticat0
- Outcome
- reduction of gas exchangee1
- Qualifier
- malfunction of the stomata and problems in gas exchange within the spongy parenchymae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The resulting malfunction of the stomata and problems in gas exchange within the spongy parenchyma are likely to be the main reason for the reduction of gas exchange”
t0“Apple Leaf Gas Exchange”
The same questions in other papers
infection · disease · Malus domestica (apple)Positive and negative results
4 papers in the same direction as this paper · 7 in the opposite direction
- positive
- positive
- positive
8 papers more in this group
See all 12 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.