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Bulletin of Botanical Research ›› 2004, Vol. 24 ›› Issue (1): 71-75.

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A method of calculating osmotic water potential (ψtlp) at turgor loss point in PV curve

LI Hong-Jian, DI Xiao-Yan, CHEN Jian-Wen, WANG Meng-Ben   

  1. Institute of Loess Plateau, Shanxi University, Taiyuan 030006
  • Received:2003-05-27 Online:2004-03-15 Published:2016-06-14

Abstract: Taking Hibiscus Rose-sinensis as an example and using SigmaPlot (Demo)for windows software, the authors introduce a method of precisely calculating the osmotic potential at turgor loss point (ψtlp)in PV curve, with which other water parameters, such as relative water content at turgor loss point (RWCtlp)and relative osmoticwater content at turgor loss point (ROWCtlp), can be calculated exactly.Firstly, two scatter curves are plotted respectively with SigmaPlot Graph Wizard, then the two curves are fitted respectively with hyperbolic and linear patterns and regression coefficients are got.Finally, using the coefficients the authors calculate the ψtlp, RWCtlp and ROWCtlp and make a comparison between the results and those of linear regression method.The method presented is simple and convenient to use.

Key words: PV curve, turgor loss point, hyperbolic equation, linear equation, equation fitting