Water relations of plants in the field: some comments on the measurement of selected parameters | Zendy

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Water relations of plants in the field: some comments on the measurement of selected parameters

Author(s) -

Hanno Richter

Publication year - 1997

Publication title -

journal of experimental botany

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.616

H-Index - 242

eISSN - 1460-2431

pISSN - 0022-0957

DOI - 10.1093/jxb/48.1.1

Subject(s) - xylem , water transport , cohesion (chemistry) , transport theory , field (mathematics) , atmosphere (unit) , environmental science , soil science , botany , chemistry , physics , statistical physics , meteorology , mathematics , biology , pure mathematics , organic chemistry , water flow

Methods for the analysis of water status and transport in the soil-plant-atmosphere continuum are briefly enumerated, with some personal comments on their reliability when used on plants growing in the field. These methods have provided us with a coherent system of data essentially free from major contradictions to the cohesion theory of water transport. It is shown that recent attempts at replacing the xylem tensions postulated by this theory with hypothetical osmotic transport mechanisms in order to accommodate data from the xylem pressure probe are not consistent with the bulk of results and furthermore are implausible in view of the energetic expenditure required.

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