Effects of nitrogen nutrition on xylem sap composition of Casuarinaceae

Walsh, Kerry B.; Ng, Bertrand; Chandler, Graeme

doi:10.1007/bf02197162

Cited by 28 publications

(14 citation statements)

References 9 publications

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“…Four weeks after germination, seedlings were transplanted into pots containing steam-sterilized acid-washed coarse sand. Pots were watered to field capacity daily and a complete N-flee nutrient solution was applied weekly to each pot (Walsh et al, 1984).…”

Section: Methodsmentioning

confidence: 99%

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The effects of salinity on growth, nodulation and nitrogen fixation ofCasuarina equisetifolia

1987

Plant Soil

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The growth, nodulation and nitrogen fixation of Casuarina equ&etifolia were compared at six levels (0~500 mM NaCI) of salinity in sand culture. Dry weight of nodules, shoots and roots and N content of shoots increased at intermediate levels of salinity (50-100 mM) but decreased at 500 mM NaC1. Nodulation occurred at all NaC1 levels, but at 500 mM NaC1 level, the nodule dry weight declined by 50% from the control. Increasing NaC1 concentration of up to 200mM had little effect on the N2-fixation rate, but at 500mM NaCI level the rate decreased to 40% of the control value.

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Section: Methodsmentioning

confidence: 99%

“…Dry weights were determined for shoots, roots and nodules. Samples were analyzed for N, by micro Kjeldahl procedure (Walsh et al., 1984).…”

Section: Methodsmentioning

confidence: 99%

The effects of salinity on growth, nodulation and nitrogen fixation ofCasuarina equisetifolia

1987

Plant Soil

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“…For other tree genera, a number of authors have commented similarly on the utility of xylem sap analysis for diagnostic purposes, especially in studies of soil nutrient availability and tree nutrient status and growth potential (e.g. see Berger et al 1994;Dambrine et al 1995;Kazda and Weilgony 1988;Stark et al 1984Stark et al , 1989Tonin et al 1990;Walsh et al 1984). Nevertheless, analyses of xylem sap alone are likely to constitute poor indicators of nutritional condition because of complications arising from (a) transient and long-term storage of xylemdelivered nutrients in mature parts of shoots and roots (e.g.…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal variations in phloem sap composition of plantation-grown Eucalyptus globulus

et al. 1998

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Spontaneous bleeding of sugar-rich sap from cambial-deep incisions in the bark of trunks was demonstrated for Eucalyptus globulus and other eucalypts across a range of localities and seasonal conditions in south-west Australia. High levels of sucrose and raffinose (up to 31% w/v total sugars) were present in the exudates, and upward and downward gradients in exudate sugar concentrations were recorded between samples obtained at different heights up trunks of E. globulus. The data indicated a phloem origin for the exudates, with source:sink pressure gradients driving translocation. Concentration ratios of sugars to amino acids were consistently lower in exudate from upper (distal) than basal regions of trunks, suggesting preferential partitioning of nitrogen upwards towards the trunk apex. A comparison of phloem and xylem sap composition from one plantation over a season showed nitrate in xylem but not phloem and substantial amounts of sodium, and high concentrations of chloride and sulphate relative to phosphate in xylem and phloem. Phloem sap sampled across a range of 29 contrasting plantations of E. globulus at peak stress (autumn) showed great inter-site variability in concentrations of amino acids, sulphur, sodium and certain trace elements and in C:N and Na:K ratios of sap. Carbon isotope ratios (δC) were strongly correlated with sugar concentrations of the sap samples from these and other plantations. Use of sap compositional attributes of phloem and δC values of translocated carbon is suggested for assessing the current nutritional condition and water status of E. globulus plantings.

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“…Tonin et al 1990) and Casuarina (e.g. Walsh et al 1984;Sellstedt and Atkins 1991), have received little attention. From the available data, it appears that pools of soluble, non-protein nitrogen in sap and foliage of trees are also dominated by amino compounds (e.g.…”

Section: Although Nitrate Maymentioning

confidence: 99%

Effects of phosphorus supply on growth and nitrogen fractions in xylem sap and foliage of Eucalyptus regnans (F.Muell.), E. nitens (Maiden) and E. globulus (Labill.) seedlings: implications for herbivory

Adams

Attiwill

Wang

1995

Trees

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Abstract. Rates of growth of seedlings of E. globulus, E.regnans and E. nitens were related to phosphorus supply in two soils but concentrations of total nitrogen and total phosphorus in most plant tissues did not vary significantly among soil or phosphorus treatments. Differences in concentrations of nitrogen and phosphorus and in the composition of the pool of free amino-acids among leaves at different stages of development were far greater than differences between treatments. The most significant of these differences were several-fold greater concentrations of arginine in the oldest leaves and these are most likely due to protein degradation and/or in situ synthesis since arginine is not generally phloem mobile. The concentration of reduced nitrogen in xylem sap was inversely related to growth and glutamine was by far the dominant nitrogenous solute. We suggest that specific nitrogenous solutes may be useful indices of the nitrogen status of eucalypt tissues for insect herbivores.

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Effects of nitrogen nutrition on xylem sap composition of Casuarinaceae

Cited by 28 publications

References 9 publications

The effects of salinity on growth, nodulation and nitrogen fixation ofCasuarina equisetifolia

The effects of salinity on growth, nodulation and nitrogen fixation ofCasuarina equisetifolia

Spatial and temporal variations in phloem sap composition of plantation-grown Eucalyptus globulus

Effects of phosphorus supply on growth and nitrogen fractions in xylem sap and foliage of Eucalyptus regnans (F.Muell.), E. nitens (Maiden) and E. globulus (Labill.) seedlings: implications for herbivory

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