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Pakistan Journal of Biological Sciences
Year: 1998  |  Volume: 1  |  Issue: 4  |  Page No.: 252 - 255

The Influence of NaCl on the Cell Cycle and Growth Fraction in the Root Meristems of Triticum aestivum cvs. Lyallpur 73 and Lu-26-S

M. Hanif and M. S. Davies    

Abstract: The seedlings of Triticum aestivum cvs. Lyallpur 73 and Lu-26-S were grown in aerated 0.1 Rorison nutrient solution for 72 hours. Then the kinetics of cells cycle in the root meristem were determined by a pulse labelling experiment with low specific activity tritiated thymidine following a 70 hours exposures to three concentrations of NaCl (0, 30, 70 mM NaCl). Treatments with 30 and 70 mM NaCl increased the length of cell cycle in cv Lu-26-S but that of Lyallpur 73 was decreased. The growth fraction (refers to percentage of meristematic cells which are actively cycling as opposed to these that are not cycling in the meristem) was increased in Lyallpur 73 from 7.9 to 11.11% over the range of 0-70 mM NaCl whereas that of Lu-26-S was decreased in response to increasing NaCl concentration.

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