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Sap flow as an indicator of transpiration and the water status of young apricot trees (2000)

Alarcón, J.J. ; Domingo, R. ; Green, S.R. ; [et al.]

Springer

Plant and soil 227 (2000), S. 77-85

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ISSN: 1573-5036

Keywords: drought ; hydraulic resistance ; leaf water relations

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract The relationship between water loss via transpiration and stem sap flow in young apricot trees was studied under different environmental conditions and different levels of soil water status. The experiment was carried out in a greenhouse over a 2-week period (November 2–14, 1997) using three-year-old apricot trees (Prunus armeniaca cv. Búlida) growing in pots. Diurnal courses of leaf water potential, leaf conductance and leaf turgor potential also were recorded throughout the experiment. Data from four days of different enviromental conditions and soil water availability have been selected for analysis. On each of the selected days the leaf water potential and the mean transpiration rates were well correlated. The slope of the linear regression of this correlation, taken to indicate the total hydraulic resistance of the tree, confirmed an increasing hydraulic resistance under drought conditions. When the trees were not drought stressed the diurnal courses of sap flow and transpiration were very similar. However, when the trees were droughted, measured of sap flow slightly underestimated actual transpiration. Our heat-pulse measurements suggest the amount of readily available water stored in the stem and leaf tissues of young apricot trees is sufficient to sustain the peak transpiration rates for about 1 hour.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1026520111166

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Theoretical study of the derivative hydrocarbons of biphenylene. I. Electronic spectrum of the biphenylenePart of this work was presented at the second Canadian Symposium on Quantum Chemistry, Montreal, June 1967. (1969)

Peradejordi, F. ; Domingo, R. ; Ferńndez-Alonso, J. I.

New York, NY : Wiley-Blackwell

International Journal of Quantum Chemistry 3 (1969), S. 683-698

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ISSN: 0020-7608

Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The electronic spectrum of biphenylene has been studied theoretically. The investigation is based on the semi-empirical LCAO SCF MO method with various degrees of approximations. The results have been analysed with regard to the following two factors: (a) The difference in effective electronegativity between the carbon atoms in the four-membered ring and the other carbon atoms in the molecule. (b) The inclusion of doubly excited configurations in the description of the π-electronic molecular states. The theory satisfactorily interprets the excitation energies and the nature of the electronic transitions. The predictions are particularly affected by the inclusion of the doubly excited configurations. On the basis of these results, the empirical parameters used are discussed.

Additional Material: 4 Ill.