IN SUPPORT OF PHYLLORHIZE?

Based on a study of adult and juvenile plants of over a dozen selected taxa of ferns it is shown that the cormophytic plant body is composed mainly of leaves and roots associated with them. Each leaf is associated with a basal root and one or more lateral roots, and the main bulk of the stem consist...

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Bibliographic Details
Published inCurrent science (Bangalore) Vol. 54; no. 20; pp. 1025 - 1035
Main Author NAYAR, B. K.
Format Journal Article
LanguageEnglish
Published CURRENT SCIENCE ASSOCIATION 20.10.1985
Subjects
Branches
Cardiovascular system
Cylinders
Ferns
Leaves
Plant roots
Plants
Root stele
Taxa
Tracheids
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Summary:Based on a study of adult and juvenile plants of over a dozen selected taxa of ferns it is shown that the cormophytic plant body is composed mainly of leaves and roots associated with them. Each leaf is associated with a basal root and one or more lateral roots, and the main bulk of the stem consists of leaf bases; no roots other than leaf-associated ones do occur. Vascular differentiation occurs associated with leaves and roots only. Basal regions of vasculature of leaves are interconnected to constitute the stele found in the stem. Protostele of juvenile plants is a product of interconnected bases of simple cylindrical vasculature of juvenile leaves. Transition from protostele to dictyostele is correlated with change to channel-like form of leaf vasculature and not by parenchymatisation of centre of protostele. Axial theory, Stelar concept and Size and Form hypothesis do not explain the characteristic morphology of primitive vascular plants. The present study supports Phyllorhize theory to some extent.
ISSN:0011-3891