| Pak. J. Bot., 18(1): 1-7. | Back to Contents | ||||
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Updated: 10-12-12 | ||||
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NATURAL GROWTH SUBSTANCES AND WOOD DIFFERENTIATION IN BLUE PINE (PINUS
WALLICHIANA, A.B. JACKS.). T.M. KHATTAK AND A. MAHMOOD Abstract: Twenty-five trees selected in a large Blue pine stand in Burban Forest in Murree Forest Division were studied for xylem cell formation and seasonal variation in the amount of natural growth subsŽtances. Auxin extracted during different periods of the season showed significant correlation with the radial diameter of tracheid, but no significant correlation was found between the rate and duration of the radial enlargement of differentiating tracheid and the auxin level. There was no significant correlaŽtion in seasonal changes in natural auxin and cell wall thickness of tracheid. Significant correlation was found between cell wall thickness of tracheid and the duration of phase of maturation. Water soluble inhibitors showed significant correlation with the duration of phase of maturation. Department of Botany, University of Karachi, Karachi-32, Pakistan. |
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