Abstract
Abstract Specific leaf weight (SLW), the ratio of leaf dry matter to area, often increases in plants exposed to elevated UV‐B radiation (280–315 nm). Increased SLW can result from greater leaf thickness or increased leaf density ( e.g . accumulation of high density substances in cells). The basis for large increases in SLW was examined in the first and third leaves of cucumber differing in developmental stage at the start of UV treatment. Leaf 1 was approximately 50% fully expanded, while leaf 3 had just unfolded. It is shown here that up to 80% of the UV‐generated change in SLW in leaf 1 was caused by accumulation of nonstructural carbohydrates, especially starch (increasing from 13 to 23% of total dry weight). Leaf 3 contained a much smaller proportion of nonstructural carbohydrates (less than 8%) and the effect on SLW was correspondingly less. As shown in the previous paper, UV‐B inhibition of growth in leaf 3 was reversed by supplemental blue light (BL) in a fluence‐dependent manner between 0.23 to 2.68 mol m 2 perday. Fluence‐response curves revealed that supplemental BL reversed both the UV‐induced accumulation of starch and increase in SLW in leaf 1 over the same range. The data are consistent with a back‐up of photosynthate into leaf 1 as a result of UV‐B inhibition of growth in leaf 3. The data also demonstrate that increases in SLW cannot be assumed to represent increases in leaf thickness.
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Claims 7
Claim · model-written summary
Up to 80% of the UV-induced specific leaf weight change in cucumber leaf 1 was attributed to carbohydrate accumulation.
- Taxon
- cucumber
Cucumis sativuse1 - Organ / stage
- leaf 1e0
- Outcome
- UV‐generated change in SLWe0
- Value
- up to 80%e0
- Qualifier
- accumulation of nonstructural carbohydrates, especially starche0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is shown here that up to 80% of the UV‐generated change in SLW in leaf 1 was caused by accumulation of nonstructural carbohydrates, especially starch (increasing from 13 to 23% of total dry weight).”
e1“first and third leaves of cucumber”
Claim · model-written summary
Starch rose from 13 to 23% of cucumber leaf 1 dry weight under UV.
- Taxon
- cucumberCucumis sativuse1
- Organ / stage
- leaf 1e0
- Outcome
- starche0
- Direction
- increasinge0
- Value
- 13 to 23% of total dry weighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is shown here that up to 80% of the UV‐generated change in SLW in leaf 1 was caused by accumulation of nonstructural carbohydrates, especially starch (increasing from 13 to 23% of total dry weight).”
e1“first and third leaves of cucumber”
Claim · model-written summary
Cucumber leaf 3 had less than 8% nonstructural carbohydrates.
- Taxon
- cucumberCucumis sativuse1
- Organ / stage
- Leaf 3e0
- Outcome
- nonstructural carbohydratese0
- Direction
- much smallere0
- Value
- less than 8%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf 3 contained a much smaller proportion of nonstructural carbohydrates (less than 8%) and the effect on SLW was correspondingly less.”
e1“first and third leaves of cucumber”
Claim · model-written summary
The UV effect on specific leaf weight was smaller in cucumber leaf 3.
- Taxon
- cucumberCucumis sativuse1
- Organ / stage
- Leaf 3e0
- Outcome
- effect on SLWe0
- Direction
- lesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf 3 contained a much smaller proportion of nonstructural carbohydrates (less than 8%) and the effect on SLW was correspondingly less.”
e1“first and third leaves of cucumber”
Claim · model-written summary
Supplemental blue light reversed UV-induced starch accumulation and specific leaf weight increase in leaf 1.
- Taxon
- cucumberCucumis sativuse1
- Organ / stage
- leaf 1e0
- Treatment
- supplemental BLe0
- Outcome
- accumulation of starch and increase in SLWe0
- Direction
- reversede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fluence‐response curves revealed that supplemental BL reversed both the UV‐induced accumulation of starch and increase in SLW in leaf 1 over the same range.”
e1“first and third leaves of cucumber”
Claim · model-written summary
The authors interpret the data as photosynthate accumulating in leaf 1 after UV-B inhibited leaf 3 growth.
- Taxon
- cucumberCucumis sativuse1
- Outcome
- back‐up of photosynthate into leaf 1e0
- Qualifier
- UV‐B inhibition of growth in leaf 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The data are consistent with a back‐up of photosynthate into leaf 1 as a result of UV‐B inhibition of growth in leaf 3.”
e1“first and third leaves of cucumber”
Claim · model-written summary
Increased specific leaf weight need not indicate increased leaf thickness.
- Taxon
- cucumberCucumis sativuse1
- Outcome
- increases in SLW cannot be assumed to represent increases in leaf thicknesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The data also demonstrate that increases in SLW cannot be assumed to represent increases in leaf thickness.”
e1“first and third leaves of cucumber”
The same questions in other papers
light · growth · Cucumis sativus (cucumber)Results differ
52 papers in the same direction as this paper · 29 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- negative
79 papers more in this group
See all 83 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.