Abstract
The rate of cell enlargement depends on cell-wall extensibility (m) and on the amount of turgor pressure (P) which exceeds the wall yield threshold (Y). The difference (P-Y) is the growth-effective turgor (P e). Values of P, Y and P ehave been measured in growing bean (Phaseolus vulgaris L.) leaves with an isopiestic psychrometer, using the stress-relaxation method to derive Y. When rapid leaf growth is initiated by light, P, Y and P eall decrease. Thereafter, while the growth rate declines in maturing leaves, Y continues to decrease and P eactually increases. These data confirm earlier results indicating that the changes in light-stimulated leaf growth rate are primarily controlled by changes in m, and not by changes in P e. Seedlings incubated at 100% relative humidity have increased P, but this treatment does not increase growth rate. In some cases Y changes in parallel with P, so that P eremains unchanged. These data point out the importance of determining P e, rather than just P, when relating cell turgor to the growth rate.
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Abbreviations
- FC:
-
fusicoccin
- m :
-
wall extensibility
- P :
-
turgor pressure
- P e :
-
effective turgor
- RH:
-
relative humidity
- Y :
-
yield threshold
- Ίw :
-
water potential
- Ίs :
-
osmotic potential
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Van Volkenburgh, E., Cleland, R.E. Wall yield threshold and effective turgor in growing bean leaves. Planta 167, 37–43 (1986). https://doi.org/10.1007/BF00446366
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DOI: https://doi.org/10.1007/BF00446366