Studies on cortical cell dimensions in cotton seedling roots
1999
Chachar, Q.I. | Laidman, D.L. (Sindh Agriculture Univ., Tandojam (Pakistan). Dept. of Physiology and Biochemistry) | Sethar, M.A. | Mirbahar, R.B.
Cotton (Gossypium hirsutum L.) cv. MNH-93 was tested to determine differences in the cortical cell dimensions and number of cell files between slow-growing and fast-growing roots. It was concluded that cell length increased slightly between 6.0 and 7.5 mm from the tip but not much thereafter. This indicates that at 7.5 and 9.0 mm from root tip, the cells were fully elongated. The long roots had longer cells as compared to the cells of short roots. The age of the root had no significant effect on cell length. At early growth stages (36 and 60 h), long roots had wider cells as compared to short roots, but at later growth stages (84 h) the situation was reversed. At 36 and 60 h after germination, the elongated cells of long roots had a greater volume as compared to those of short roots, but this effect disappeared in 84 h. There was a significant increase in cell volume with increasing distance from the root tip. The number of cell files did not increase significantly with increase in distance from the tip but if decreased with increasing root length in all germination times. The age of the root had a significant effect on the number of cell files, so the younger roots contained more cell files as compared to older ones.
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