An index of osmotic adjustment that allows comparison of its magnitude across species and experiments

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    Abstract

    It is difficult to compare the magnitude of osmotic adjustment (OA) between species and experiments. Currently, comparisons are made by determining the magnitude of OA (MPa) at predetermined values of leaf water content, e.g. a relative water content (RWC) of 70%. The relationship between the natural logarithms of leaf water content (RWC, dependent variable) and leaf osmotic potential (pi, independent variable) has a slope of 1.0 for the concentration effect. For tissues that adjust osmotically, the slope will be less than 1.0 and the osmotic index will be 1.0 - slope. The index applies to all the patterns of n(RWC) vs ln(pi) observed in experiments and is independent of the amount of drying achieved. An index of 1.0 is full capacity for OA, and a value of 0.0 is no OA. Three examples of the application of the index are given for data published on sorghum, wheat and grape vines.
    Original languageEnglish
    Pages (from-to)478-482
    JournalPhysiologia Plantarum
    Volume127
    Issue number3
    DOIs
    Publication statusPublished - 2006

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    water content
    Water
    leaves
    Sorghum
    Vitis
    osmotic pressure
    vines
    Triticum
    grapes
    drying
    wheat

    Cite this

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    title = "An index of osmotic adjustment that allows comparison of its magnitude across species and experiments",
    abstract = "It is difficult to compare the magnitude of osmotic adjustment (OA) between species and experiments. Currently, comparisons are made by determining the magnitude of OA (MPa) at predetermined values of leaf water content, e.g. a relative water content (RWC) of 70{\%}. The relationship between the natural logarithms of leaf water content (RWC, dependent variable) and leaf osmotic potential (pi, independent variable) has a slope of 1.0 for the concentration effect. For tissues that adjust osmotically, the slope will be less than 1.0 and the osmotic index will be 1.0 - slope. The index applies to all the patterns of n(RWC) vs ln(pi) observed in experiments and is independent of the amount of drying achieved. An index of 1.0 is full capacity for OA, and a value of 0.0 is no OA. Three examples of the application of the index are given for data published on sorghum, wheat and grape vines.",
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    language = "English",
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    An index of osmotic adjustment that allows comparison of its magnitude across species and experiments. / Turner, David.

    In: Physiologia Plantarum, Vol. 127, No. 3, 2006, p. 478-482.

    Research output: Contribution to journalArticle

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