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- W2122277423 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." @default.
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- W2122277423 date "1994-08-01" @default.
- W2122277423 modified "2023-09-27" @default.
- W2122277423 title "UV-B-INDUCED INCREASE IN SPECIFIC LEAF WEIGHT OF CUCUMBER AS A CONSEQUENCE OF INCREASED STARCH CONTENT" @default.
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- W2122277423 doi "https://doi.org/10.1111/j.1751-1097.1994.tb05076.x" @default.
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