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Ontogeny of palmately compound leaves in angiosperms: 3.Arisaema Spp.

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Proceedings / Indian Academy of Sciences

Abstract

Arisaema is mono or bifoliar, exhibiting sympodial growth with annual conversion of the shoot apex into the floral apex. The shoot apex shows pendulum symmetry during successive plastochrons.

Leaf initiation is hypodermal. The primordium quickly acquires the configuration of a 5 layered laminar plate meristem and its base extends around the shoot apex as the sheath. Following this, apical growth ceases in the primordium. Its apex becomes a hood like lamina wing and the sheath develops a median adaxial meristem which leads to its thickening. The lamina wing expends and becomes plicately folded at right angles to its surface. Each fold becomes a leaflet by the elongation of the abaxial edges and suppression of the adaxial edges of the folds. Early abortion of the lamina wing results in a scale leaf which comprises the sheath portion alone.

An adult leaf has 300-400 veins which run independently from the corm to the leaflets through the petiole. The dorsal median strand develops first and goes to the midrib of the median leaflet. Subsequent strands arise laterally on either side of this in a series of tangential rows. Those of the first row bifurcate at the tip of the petiole to enter two neighbouring leaflets. The strands run parallel in the leaflet midrib and diverge at different levels into the lamina as lateral veins.

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Author notes

  1. E A Muruganathan

    Present address: Department of Botany, Government Arts College, 648 001, Ootacamund, India

Authors and Affiliations

  1. Department of Botany, Bharathidasan University, 620 023, Tirchirapalli, India

    K Periasamy & E A Muruganathan

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  1. K Periasamy
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  2. E A Muruganathan
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Periasamy, K., Muruganathan, E.A. Ontogeny of palmately compound leaves in angiosperms: 3.Arisaema Spp.. Proc. Indian Acad. Sci. 96, 475–486 (1986). https://doi.org/10.1007/BF03053542

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  • DOI: https://doi.org/10.1007/BF03053542

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