The long-term fate and distribution of 14C photoassimilated by young white pines in late summer

Ursino, D. J.; Paul, Joby

doi:10.1139/b73-082

Cited by 20 publications

(5 citation statements)

References 6 publications

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“…When carbohydrates are limiting, storage carbon may be translocated from coarser roots to finer ones (Ericsson and Persson 1980), not vice a versa. It is even more improbable that carbon is translocated further to above ground parts of a seedling (Ursino andPaul 1973, Marshall andWaring 1985). Thus, it seems that carbon is lost from the finest roots through respiration.…”

Section: Discussionmentioning

confidence: 99%

“…In conifers, shoot elongation seems to be independent of reserve material formed in the previous autumn since the previous year's needles supply the developing shoots with current photosynthates (Ursino and Paul 1973, Hansen and Beck 1990, Fischer and Höll 1992. However, contrasting opinions have been presented (Olofinboba andKozlowski 1973, Little 1974).…”

Section: Introductionmentioning

confidence: 99%

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Redistribution of 14C-labelled reserve carbon in Pinus sylvestris seedlings during shoot elongation

Lippu¹

1998

Silva Fenn.

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Lippu, J. 1998. Redistribution of 14 C-labelled reserve carbon in Pinus sylvestris seedlings during shoot elongation. Silva Fennica 32(1): 3-10.This study examined the later use of 14 C reserves formed in previous autumn in Scots pine (Pinus sylvestris L.) seedlings. The seedlings were allowed to photosynthesise 14 CO 2 in early September when shoot and needle growth was over. The following spring the seedlings were harvested in five samplings during the shoot growth period. The distribution and concentration of 14 C were determined and the results were compared with the growth data. It was observed that reserves were not used markedly for the new growth. Most of the 14 C was found in one-year-old needles (30-40 %) and in the root system (40-50 %) which was due to both their high activity as a storage sink and their large sink size. The high initial 14 C-activity in the finest roots decreased indicating respiration of reserves. Only a small percent of the reserve carbon was found in the new shoots which indicated that reserves are of minor importance in building a new shoot. An allocation of about 15 % of the autumn storage to the stem suggested that in seedlings the stem is of minor importance as a storage organ.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Redistribution of 14C-labelled reserve carbon in Pinus sylvestris seedlings during shoot elongation

Lippu¹

1998

Silva Fenn.

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“…The stem and the roots receive maximal amounts of current photosynthate in late summer and autumn (Hansen and Beck 1990;Gordon and Larson 1968;Ursino et al 1968;Ursino and Paul 1973). The stem and the roots receive maximal amounts of current photosynthate in late summer and autumn (Hansen and Beck 1990;Gordon and Larson 1968;Ursino et al 1968;Ursino and Paul 1973).…”

Section: Discussionmentioning

confidence: 99%

Food reserves of scots pine (Pinus sylvestris L.)

Fischer

Höll

1992

Trees

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Starch, soluble sugars, triacylglycerols, diacylglycerols and free fatty acids were measured in 30-year-old Scots pine (Pinus sylvestris L.) trees during an annual cycle in the sapwood (youngest ten xylem rings). The radial distribution of carbohydrates and lipids was studied in the trunkwood of 90-to 150-year-old Scots pine trees collected at the end of the growing season. Determination of the compounds was performed using specific enzymatic assays, capillary gas chromatography and thin layer chromatography. The amounts of glucose, fructose, sucrose, and galactose/arabinose in the sapwood were slightly higher in winter than in summer. Raffinose/stachyose increased up to 5-fold during the cold period. At the beginning of the growing season starch amounts rose, and then decreased in summer and autumn. No concentration changes were observed in the total amounts of diacylglycerols and fatty acids throughout the year. Triacylglycerol levels were slightly higher in February than in summer and autumn. Relative frequencies of individual fatty acids were similar in all lipid fractions. Glucose, fructose, sucrose, starch and triacylglycerols disappeared almost entirely at the transition zone from sapwood to heartwood. In contrast, free fatty acids and galactose/arabinose rose in centripetal direction, and diacylglycerols remained constant across trunk cross-sections. The relative amounts of individual fatty acids changed markedly in the free fatty acid fraction and in the triacylglycerols when crossing the sapwoodheartwood boundary. Concentration changes of reserve materials are discussed in relation to season, mobilization and translocation processes, dormancy, frost resistance, and heartwood formation. The results are compared to those found in needles.

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“…Previous isotopic data on C 0 2 uptake by conifers were mainly obtained in laboratory experiments on seedling-and sapling-sized trees (e.g. Shiroya et al, 1966;Larson, 1968, 1970;Ursino and Paul, 1973;Schier, 1970;Niziolek et al, 1969;Webb, 1977) with short-duration, high-activity I4C spikes. The results of the present 1962 to 1964 bomb tracer "experiment" pertain to a young mature tree growing under natural conditions.…”

Section: Introductionmentioning

confidence: 99%

Rapid response of tree cellulose radiocarbon content to changes in atmospheric 14CO2 concentration

Grootes

Farwell

Schmidt

et al. 1989

Tellus B: Chemical and Physical Meteorology

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A detailed radial profile for the I4C concentration in tree stem cellulose, covering growth rings for the years 1962-1964, was obtained for a Sitka spruce of the US Pacific Coast using accelerator mass spectrometry. The tree cellulose I4C closely follows atmospheric I4CO2 concentrations, responding to changes with an apparent delay of 5 to 6 weeks. The delay in response is mostly due to the addition of between 13% and 28% of biospheric C 0 2 to the canopy-air C 0 2 used by the tree for stem cellulose. Delayed incorporation and the use of stored photosynthate of the previous fall appear less important. W 1 0

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The long-term fate and distribution of ¹⁴C photoassimilated by young white pines in late summer

Cited by 20 publications

References 6 publications

Redistribution of 14C-labelled reserve carbon in Pinus sylvestris seedlings during shoot elongation

Redistribution of 14C-labelled reserve carbon in Pinus sylvestris seedlings during shoot elongation

Food reserves of scots pine (Pinus sylvestris L.)

Rapid response of tree cellulose radiocarbon content to changes in atmospheric <sup>14</sup>CO<sub>2</sub> concentration

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