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Zonal structure and seasonal variations in the shoot apex ofPodocarpus gracilior pilger

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Proceedings / Indian Academy of Sciences

Summary and Conclusions

The shoot apex ofpodocarpus gracilior exhibits an organization with four cytohistological zones, (1) the surface layer, which is distinguishable into (a) the apical initials, and (b) the surface layer on the flanks, (2) the subapical initials, (3) the flanking zone, and (4) the pith mother cells and pith.

The shoot apex exhibits differences during the seasons of the year and passes through (i) the Resting period during December to February, (ii) the Period of bud expansion, during March and April, and (iii) the Period of new bud formation, during May to November. This latter period includes cataphyll formation during May and June, enlargement of the apex during July, initiation of leaf primordia at the end of July, differentiation of the crown and the beginning of the resting period in December. During these changes the shoot apex shows differences in topography, activity and details and extent of the cytohistological zones.

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Authors and Affiliations

  1. Department of Botany, Birla College, Pilani, Rajasthan

    S. K. Pillai

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  1. S. K. Pillai
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Communicated by Dr. V. Puri,f.a.sc.

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Pillai, S.K. Zonal structure and seasonal variations in the shoot apex ofPodocarpus gracilior pilger. Proc. Indian Acad. Sci. 57, 58–67 (1963). https://doi.org/10.1007/BF03053883

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  • DOI: https://doi.org/10.1007/BF03053883

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