Shoot apex,leaf development and unifacial tip inAgave wightii drumm. et prain (agavaceae) |
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Authors: | Vishnu Kumar Devendra K Awasthi Yerramilli S Murty |
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Institution: | (1) Department of Botany, Meerut University, 250 005 Meerut, India;(2) Department of Botany, M.M. P.-G. College, 201 204 Modinagar, India |
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Abstract: | The shoot apex has one tunica layer enclosing a mass of corpus which is differentiated cytohistologically into central mother
cell zone, flank zone, rib zone and a ‘cambium-like’ zone. Occurrence of ‘cambium-like’ zone during minimal phase is considered
as an expression of nodal region.
Agave wightii shows spirodistichous arrangement of leaves which have an expanded photosynthetic surface with a reduced unifacial tip. Leaves
are initiated by periclinal divisions in the second layer. Vertical growth in the leaves is by subapical initials and lateral
growth is by marginal and submarginal initials in their early stages of development. The unifacial tip is formed by the extension
of adaxial meristematic activity. The derivatives thus formed are pushed to the abaxial side of the primordiuj. Hence the
unifacial part of the leaf is regarded as equivalent to a phyllode. |
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Keywords: | Agave wightii Leaf development Shoot apex Unifacial tip |
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