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Distribution and pattern of availability of storage starch and cell death of ray parenchyma cells of a conifer tree (Larix kaempferi)

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Author Affiliations

  • 1 Graduate Training Institute, Bangladesh Agricultural University, BANGLADESH
  • 2 Department of Crop Botany, Faculty of Agriculture, Bangladesh Agricultural University, BANGLADESH
  • 3 Faculty of Agriculture, Tokyo University of Agriculture and Technology, JAPAN

Res. J. Recent Sci., Volume 1, Issue (5), Pages 28-37, May,2 (2012)

Abstract

Starch in the ray parenchyma cells of Larix kaempferi tree varies considerably on the position of trunk. The maximum starch granules observed in sapwood, mostly outer to middle part. Most starch grains were localized in middle lines of parenchyma cells rather than upper and lower lines. Parenchyma cells of the phloem part also content starch rather than outer bark due to content dead cell almost. The distribution of nuclei in secondary xylem cells of L. kaempferi resembled cell death. Starch disappearing occurred prior to cell death in secondary xylem cells. Some characteristics heartwood inducing substances synthesized just after starch depletion, which might be deposited in cell wall. Ray parenchyma cells remained alive for several years. The timing of cell death of middle ray cells different from upper and lower radial ray cells within a ray. Our results also indicate that the position of starch depletion within a ray might affect the timing of cell death. The distribution pattern of storage starch and cell death was inter-linked with each other. This relationship controls the formation of heartwood in conifer trees. This report would be helpful for further research to clarify the heartwood formation in conifers, which has importance in tree breeding program and improvement of quality wood.

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