Abstract
The mutual relationship between the water potential and water saturation deficit (w.s.d.) was studied on samples of leaf tissue of fodder cabage. Definite values of water potential were obtained by long-term exposure of plant material to an atmosphere with definite constant pressure of water vapour. The resulting w.s.d. values were determined gravimetrically.
Water saturation deficit varies indirectly with the water potential. This dependence was linear for values of water potential from −4·4 to −43·9 atm.
Since the stabilization of equilibrum of water potential between the leaf tissue and surrounding atmosphere was very slow the relationship between water potential and w.s.d. was influenced by the size of samples and by the length of exposure. Therefore this method was more suitable for relative than for absolute measurement.
Abstract
Ve vzorcích listového pletiva krmné kapusty byla sledována vzájemná závislost vodního potenciálu a vodního sytostního deficitu. Hodnoty vodního potenciálu byly navozeny dlouhou exposicí materiálu v atmosféře s určitou konstantní tensí vodní páry a odpovídající hodnoty v.s.d. byly stanoveny gravimetricky.
Vodní sytostní deficit je nepřímo úměrný vodnímu potenciálu. Pro hodnoty vodního potenciálu −4,4 až −43,9 atm byla jejich závislost lineární.
Poněvadž ustavování rovnováhy vodního potenciálu mezi listovým pletivem a okolním vzduchem bylo velmi pomalé, byla závislost vodního potenciálu a v.s.d. ovlivněna velikostí sledovaného vzorku a délkou exposice. Tato metoda je tedy vhodná spíše k relativním než k absolutním měřením.
Abstract
Иееледовалась взаимная завис имость водного потенциала и водного дефицита в образцах ткани листьев кормовой капусты. Необходимый водный потенциал ткани получали длительной экспозицией материала в атмосфере с постоянным давлением водного пара и соответствующий водный дефицит определяли гравиметрически.
Водный дефицит был обратно пронорциональным водному потенциалу. В границах от −4,4 атм до −43,9 их зависимость была линейной.
Так как устанавливание равновесия водного потенциала между тканью листа и окружающим воздухом происходило очень медленно, на зависимость водного потенциала и водного дефицита влияли размеры исследованных образцов и продолжительность экспозиции. Вследствии этого данный метод более подходит к относительным чем к абсолютным измерениям.
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Pospíšilová, J. Determination of relationships between water potential and water saturation deficit in leaf tissue. Biol Plant 11, 202–207 (1969). https://doi.org/10.1007/BF02920798
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DOI: https://doi.org/10.1007/BF02920798