Leaf and Cotyledon Architecture in The Seedling of Catharanthus Roseus (L.)

Authors

  • Patel Kailash P.  Department of Biosciences, V.N.S.G University, Surat, Gujarat, India

Keywords:

Leaf, cotyledon, architecture, Catharanthus roseus

Abstract

Catharanthus roseus is a perennial small herb or sub-shrub, up to 90 cm in height. Stem is erect, with flexible long branches, purple or light green. Leaf architecture and cotyledon architecture including venation pattern has been studied in Catharanthus roseus (L.) of the Apocynaceae. The Leaves are simple, cauline, opposite, ex-stipulate, petiolate, elliptic ovate to oblong, 4-10 by 2-4 cm glabrous to pubescent, base acute or connate, apex obtusely apiculate and lateral nerves 10-12 pairs. Petiole is 1.0- 1.5 cm long. The major venation pattern conforms to pinnate camptodromous type with festooned brochidodromous secondaries. The qualitative and quantitative features are studied. The leaf and cotyledon size, areole size, number of vein endings entering the areoles and number of vein terminations entering the areoles vary from species to species even within the same species of Catharanthus roseus. The highest degree of vein order is observed up to 5°. Isolated tracheids, isolated vein endings, isolated free vein endings and tracheoidal elements are noticed. Loops may be formed by vein-lets only or by vein-lets and tracheids. The terminal tracheids of vein endings show an increase in cell diameter are of various shapes and occur single or in groups of 2 - 3 or more per vein-let terminus. The primary and secondary veins are surrounded by a multiseriate bundle sheath and vein-lets and vein endings have uniseriate sheath. Cotyledons have pinnate venation. They differ in sub type which is camptodromous, hypodromous or eucamptodromous. The primary, secondary and tertiary veins resemble in several characters. The marginal ultimate venation is incomplete or looped.

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International Journal of Scientific Research in Science, Engineering and Technology

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Published

2015-08-30

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Volume 1, Issue 4, July-August-2015

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Research Articles

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[1]
Patel Kailash P., " Leaf and Cotyledon Architecture in The Seedling of Catharanthus Roseus (L.), International Journal of Scientific Research in Science, Engineering and Technology(IJSRSET), Print ISSN : 2395-1990, Online ISSN : 2394-4099, Volume 1, Issue 4, pp.512-520, July-August-2015.