Stomata in Orchidaceae

 

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Rhynchostylis retusa

Stomatal structure of some Indian orchids with reference to taxonomy.

by Das S., Paria N. (1992)

Sauren Das, Agricultural & Ecological Research University, India

Paria N.

in Bangladesh J. Bot., 21: 65-72 –

https://eurekamag.com/research/007/821/007821823.php

Abstract

Stomatal structure of 19 species of Indian orchids under 12 genera have been studied.

The ontogenetic study of 4 species (Cymbidium aloifolium, Dendrobium pierardi, Rhynchostylis retusa and Vanda tessellata) have been traced and it is revealed that the Orchidaceae have the perigenous type of stomatal development which agrees with some earlier investigations.

On the basis of the arrangement of subsidiary cells in respect of guard cells, the stomata of the investigated taxa may be grouped into three types where the guard cells are surrounded by

a) .+-. similar 4 epidermal cells (type I),

b) 4 epidermal cells, two of which are elongated and parallel to the long axis of the guard cells and two polar short rectangular cells (type II), and

c) cells which are least differentiated from the neighbouring epidermal cells (type III).

These stomatal types are of taxonomic relevance to some extent. [The other species studied were Aerides multiflorum, A. odoratum, C. pendulum, Dendrobium bensoniae, D. densiflorum, D. secundum, D. phalaenopsis, Eulophia andamanensis, Habenaria digitata, Pholidota imbricata, Saccolabium trichromum, Sarcanthus isectifer, Spathoglottis plicata, Vanda cristata and Zeuxine strateumatica].