Daily variations of the mineral composition of xylemic exudates in tomato

Abstract

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Effects of calcium deficiency on nutrient concentration of xylem sap of excised tomato plants

“…Nevertheless, the presence of ammonium in xylem sap in presence or with a lack of Ca may also be derived from protein degradation or deamination of amino acids, probably related to the decrease of the metabolic activity of the root (Ferrario et al, 1992b), related to the lack of WSC. The effect of Ca deficiency on this process is confirmed by the increase of sulfate and nitrate concentrations in xylem sap that appears in D2, 24 hours after the beginning of the excision experiment ( Figure 3).…”

“…The quantity of xylem sap generated with all treatments was higher in daytime than at night, with an average contribution of 88.5/11.5% on the first day (Dl/Nl) and of 82.4/17.6% on the second day (D2/N2). The nychtemeral variations of xylem sap exudation could be affected by the temperature surrounding the root system (Engels et al, 1992), or by the time of excision (Urrestarazu et al, 1996) or by factors of endogenous nature (Ferrario et al, 1992a). Some authors such as Rodriguez et al (1997) have demonstrated that this night/day variation was related to the hydraulic conductivity of tomato roots which increases with the temperature of the medium and varies according to the salinity of the nutrient solution.…”

Influence of salinity on transport of Nitrates and Potassium by means of the xylem sap content between roots and shoots in young tomato plants

“…Ferrario et al,1992;Urrestarazu et al, 1996b;Kato et al, 2001;Masuda et al, 2001;Rep et al, 2003;Yamasaki, 2003) and still today (Ariga et al, 2014) for herbaceous plants. For these plants, their daily variations have been studied (e.g.…”

Effect of External Nitrogen and Potassium Supply on Xylem Sap Composition of Sugarcane

“…For example, xylem composition of deciduous trees shows a large increase in nutrient content prior to and during the initial stage of leaf emergence due to remobilization of reserves (Bollard, 1953;Tromp, 1979;Ferguson et al, 1983). Maximum fluxes of water and most organic and inorganic substances in the xylem occur during the mid day, while those fluxes are minimal during the night (Andersen and Brodbeck, 1989;Ferrario et al, 1992aFerrario et al, , 1992bSiebrecht et al, 2003). However, the variation of the concentration of individual molecular species does not necessarily follow the same diurnal variation as shown with the total flux (Ferrario et al, 1992b).…”