Abstract
An attempt has been made to assess the UV-B-protective capacity of phenolic compounds accumulated in superficial structures of plants using apple fruit as a model. Two apple (Malus domestica Borkh.) cultivars (Braeburn and Granny Smith) differing in response to high fluxes of solar radiation were selected and exposed to increasing doses of UV-B radiation. The extent of UV-B-induced damage to photosystem II of apple skin correlated with its quercetin glycoside (but not anthocyanin) content. Granny Smith apples did not demonstrate a pronounced response to high sunlight in terms of the accumulation of phenolic substances in the skin and exhibited similar patterns of Fo, Fm, and Fv/Fm changes in the course of UV-B irradiation both on sun-exposed and shaded surfaces of a fruit. Unlike Granny Smith, Braeburn fruits were characterized by a significant accumulation of quercetin glycosides in sun-exposed skin, however, shaded skin contained these compounds in similar amounts to those in Granny Smith. Accordingly, photosystem II in sun-exposed skin of Braeburn apples was resistant to high doses of UV-B radiation (up to 97 kJ m-2), whereas the susceptibility of the photosynthetic apparatus in shaded skin of Braeburn to UV-B-induced damage was much higher and similar to that of both sun-exposed and shaded skin of Granny Smith fruits. Anthocyanins, at least in the amounts found in Braeburn, did not show an additional effect in UV-B protection.
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Claims 9
Claim · model-written summary
Apple skin photosystem II damage correlated with quercetin glycoside content.
- Taxon
- apple fruits
Malus domesticat0 - Compound
- quercetin glycosidee0
- Outcome
- UV-B-induced damage to photosystem II of apple skine0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“apple fruits”
e0“The extent of UV-B-induced damage to photosystem II of apple skin correlated with its quercetin glycoside (but not anthocyanin) content.”
Claim · model-written summary
Apple skin photosystem II damage did not correlate with anthocyanin content.
- Taxon
- apple fruitsMalus domesticat0
- Compound
- anthocyanine0
- Outcome
- UV-B-induced damage to photosystem II of apple skine0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“apple fruits”
e0“The extent of UV-B-induced damage to photosystem II of apple skin correlated with its quercetin glycoside (but not anthocyanin) content.”
Claim · model-written summary
Granny Smith skin showed no pronounced accumulation of phenolic substances under high sunlight.
- Taxon
- apple fruitsMalus domesticat0
- Material
- Granny Smithe0
- Treatment
- high sunlighte0
- Outcome
- accumulation of phenolic substances in the skine0
- Direction
- did not demonstrate a pronounced responsee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“apple fruits”
e0“Granny Smith apples did not demonstrate a pronounced response to high sunlight in terms of the accumulation of phenolic substances in the skin”
Claim · model-written summary
Granny Smith showed similar Fo, Fm and Fv/Fm responses to UV-B on sun-exposed and shaded fruit surfaces.
- Taxon
- apple fruitsMalus domesticat0
- Treatment
- UV-B irradiatione0
- Outcome
- similar patterns of Fo, Fm, and Fv/Fm changese0
- Comparator
- shaded surfacese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“apple fruits”
e0“exhibited similar patterns of Fo, Fm, and Fv/Fm changes in the course of UV-B irradiation both on sun-exposed and shaded surfaces of a fruit.”
Claim · model-written summary
Braeburn sun-exposed skin accumulated significantly more quercetin glycosides.
- Taxon
- apple fruitsMalus domesticat0
- Material
- Braeburne0
- Organ / stage
- sun-exposed skine0
- Outcome
- accumulation of quercetin glycosidese0
- Direction
- accumulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“apple fruits”
e0“Braeburn fruits were characterized by a significant accumulation of quercetin glycosides in sun-exposed skin”
Claim · model-written summary
Shaded skin had compound amounts similar to Granny Smith.
- Taxon
- apple fruitsMalus domesticat0
- Organ / stage
- shaded skine0
- Outcome
- similar amountse0
- Comparator
- Granny Smithe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“apple fruits”
e0“shaded skin contained these compounds in similar amounts to those in Granny Smith.”
Claim · model-written summary
Photosystem II in sun-exposed Braeburn skin resisted UV-B doses up to 97 kJ m-2.
- Taxon
- apple fruitsMalus domesticat0
- Material
- Braeburne0
- Outcome
- photosystem II in sun-exposed skin of Braeburn apples was resistante0
- Value
- 97 kJ m-2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“apple fruits”
e0“photosystem II in sun-exposed skin of Braeburn apples was resistant to high doses of UV-B radiation (up to 97 kJ m-2)”
Claim · model-written summary
Shaded Braeburn skin was more susceptible to UV-B damage, similarly to Granny Smith skin.
- Taxon
- apple fruitsMalus domesticat0
- Material
- Braeburne0
- Outcome
- susceptibility of the photosynthetic apparatuse0
- Direction
- much highere0
- Comparator
- sun-exposed and shaded skin of Granny Smithe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“apple fruits”
e0“the susceptibility of the photosynthetic apparatus in shaded skin of Braeburn to UV-B-induced damage was much higher and similar to that of both sun-exposed and shaded skin of Granny Smith fruits.”
Claim · model-written summary
Anthocyanins at Braeburn amounts provided no additional UV-B protection.
- Taxon
- apple fruitsMalus domesticat0
- Compound
- Anthocyaninse0
- Outcome
- additional effect in UV-B protectione0
- Direction
- did not showe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“apple fruits”
e0“Anthocyanins, at least in the amounts found in Braeburn, did not show an additional effect in UV-B protection.”
The same questions in other papers
light · quality: phytochemicals · Malus domestica (apple)Positive and negative results
8 papers in the same direction as this paper · 13 in the opposite direction
- positive
- positive
- positive
18 papers more in this group
See all 22 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.