1993
DOI: 10.1093/treephys/13.1.71
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Free amino acids and protein in Scots pine seedlings cultivated at different nutrient availabilities

Abstract: Scots pine (Pinus sylvestris L.) seedlings of a provenance from northern Sweden were cultivated hydroponically for 7 weeks in a climate chamber. The nutrient solution contained either 2.5 (low-N) or 50 (high-N) mg N l(-1) with other essential elements added in a fixed optimal proportion to the nitrogen. After 5 and 7 weeks, the seedlings were analyzed for growth, total nitrogen and other essential nutrients, protein and free amino acids. Low-N seedlings grew more slowly and had higher root/shoot ratios than hi… Show more

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Cited by 48 publications
(32 citation statements)
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“…In some reports, changes in arginine amount were documented in relation to nutrient deficiency in the needles [17,29,38]. Neither macro nor micronutrient deficiency was found at the sites of the present study during 1997 estimations, nor were significant differences in element concentrations among the sites [24] revealed.…”
Section: Discussioncontrasting
confidence: 54%
“…In some reports, changes in arginine amount were documented in relation to nutrient deficiency in the needles [17,29,38]. Neither macro nor micronutrient deficiency was found at the sites of the present study during 1997 estimations, nor were significant differences in element concentrations among the sites [24] revealed.…”
Section: Discussioncontrasting
confidence: 54%
“…In addition factors that retard shoot maturation increase host-plant susceptibility to G. abietina infection (Donaubauer 1972, Uotila 1988. For example, increased nitrogen levels (Ylimartimo 1991, Barklund 1993, incomplete lignification due to rapid growth, low temperatures and light intensity during the summer (Petäistö and Repo 1988) and certain amino acids that stimulate G. abietina (Gezelius and Näsholm 1993).…”
Section: Scleroderris Cankermentioning
confidence: 99%
“…The significant increase in Asn concentrations in the roots between bud break and unfolding of new flush may be due to increased N uptake from the soil, increased mobilisation of N compounds originating from fixed N 2 , or enhanced remobilisation of stored nitrogen. The high concentrations of soluble non-protein N-compounds in the xylem in the early stages (bud break and expanding leaves) indicate transport of N remobilised from storage pools in the stem and/or the roots (Gezelius and Näsholm 1993;Schmidt and Stewart 1998). However, in these early stages of leaf development a significant part of N consumed by the growing leaves has to be supplied additionally via phloem transport from the storage tissues (Da Silva and Shelp 1990;Geßler et al 1998) resulting in increased total soluble N concentrations in phloem exudates when leaves were not yet fully expanded.…”
Section: Phenological Stagesmentioning
confidence: 99%