PALIWAL G. S. – PLANT STOMATA ENCYCLOPEDIA

Stomata in some Bignoniaceae

Epidermal Structure and Ontogeny of Stomata in some Bignoniaceae

by Paliwal G. S. (1970)

In Indian Science Congress Association Proceedings 57(4): 264

https://eurekamag.com/research/026/571/026571946.php

(No abstract found)

Stomata in some Bignoniaceae

Screen Shot 2018-02-28 at 17.46.50 — :Figs. 1-7. Bignoniaceae, distribution and orientation of stomata. Fig. 1. Bignonia unguis-cati, lower epidermis of leaf with stomata showing variable number of subsidiary cells. X 157. Fig. 2. B. gracilis, the number of subsidiary cells varies from 5-9. X 157. Fig. 3. Pyrostegia venusta, same as above. X 157. Fig. 4. Oroxylon indicum, a large stoma is seen in the centre surrounded by non-stomatiferous area. x157. Fig. 5. Tecoma stans, the stomata are encircled by a large number of subsidiary cells. x 157. Fig. 6. Tabebuia pentaphylla, stomata surrounded by 5-7 subsidiary cells; glands and hairs are also seen. X 157

Epidermal Structure and Ontogeny of Stomata in some Bignoniaceae

by Paliwal G. S. (1970)

in Flora 159: 124-132 –

https://ac.els-cdn.com/S0367253017310216/1-s2.0-S0367253017310216-main.pdf?_tid=spdf-630eb660-02fb-4b1d-9ea9-049f22859ea6&acdnat=1519836203_df5bf9552d35362958215ae9e643a801

Screen Shot 2018-02-28 at 17.51.34

1. Introduction

Of about 120 genera and 650 species included in the family Bignoniaceae (WILLIS, 1966) majority inhabit the tropics. Some of these are trees and shrubs but a large number of these, and the most interesting ones, are the lianes which might be twiners, root-climbers or tendril-climbers. Their stems exhibit many features of anatomical interest owing to peculiar mode of secondary growth. They possess opposite, exstipulate leaves which might be simple or compound. The leaf surface may become quite glossy due to the appearance of waxes or it may be without any lustre. Some leaves possess a rough texture, e. g. those of Kigelia pinnata and Tabebuia pentaphylla.

Screen Shot 2018-02-28 at 17.52.42 — Figs. 8-19. Pyrostegia venusta, development of stomata (m, meristemoid; s1 , s2, subsidiary cells). Fig. 8. Formation of a meristemoid (m) and an epidermal cell from the protodermal cell. x 628. Fig. 9. Same, after first division; one subsidiary cell (s1) has been formed. x 628. Fig. 10. Second division of the meristemoid, the second subsidiary cell has become differentiated and guard-cell-mother-cell has completed division. x 628 Fig. 11. Young stoma surrounded by two subsidiory cells. x 628. Figs. 12-14. Stomata surrounded by subsidiary cells formed as a result of divisions of the meristemoid and the protodermal cells. X 628. Fig. 15. Two mature stomata. X 628.

METCALFE and CHALK (1950) pointed out that stomata in the members of this family are confined to the lower surface and the following 3 conditions may be encountered as regards their organization:

(a) each pair of guard cells may be surrounded by a considerable number of ordinary epidermal cells;

(b) they may be para.cytic; or even

Screen Shot 2018-02-28 at 17.54.36 — Figs. 16-19. Structure of leaf epidermis in some Bignoniaceae . Fig. 16. Kigelia pinnata, portion of lower epidermis exhibiting diacytic stomata. x 215. Fig. 17, 18. Portions of upper epidermal peels of Bignonia alliacea and Jacaranda mimusifolia respectively; the orientation of the cuticular striations is also illustrated. x 215. Fig.19. Portion of the peel from the upper epidermis of Tecoma stans; mark the 2 cells possessing, dense contents and a characteristic appearance. x 215.

In view of this variability in the organization of the mature stomatal apparatus and in the absence of any ontogenetic study, the present investigation was undertaken to fill up this gap in our knowledge.