Non-functional stomata in the flowers of tropical orchids

 

 

Occurrence of non-functional stomata in the flowers of tropical orchids

by Hew C. S., Lee G. L., Wong S. C. (1980)

Nanyang University, Singapore

in Ann. Bot. 46: 195-201 – https://doi.org/10.1093/oxfordjournals.aob.a085907

https://academic.oup.com/aob/article-abstract/46/2/195/155136/Occurrence-of-Non-functional-Stomata-in-the?redirectedFrom=PDF

Abstract

The morphology and physiology of the stomata of several tropical orchid flowers were studied in relation to the transpiration of these flowers.

Stomata were present in all orchid flowers studied. The density of stomata in floral parts was considerably lower than in the leaves. Also, the distribution of stomata in various floral parts varied.

Floral stomata were incapable of photosynthesis although they contained starch. Stomatal conductance and transpiration were not affected by changes in CO2concentration, irradiance, relative humidity and abscisic acid treatment.

Water vapour conductance in flowers was low and comparable to that of upper epidermis of the leaves which in all cases was devoid of stomata. The transpiration of orchid flowers in light and in dark was identical. This, together with other evidence indicates that stomata in orchid flowers do not function in the control of water loss.

 

Scan 1

Advertisements

Published by

Willem Van Cotthem

Honorary Professor of Botany, University of Ghent (Belgium). Scientific Consultant for Desertification and Sustainable Development.

Leave a Reply

Please log in using one of these methods to post your comment:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s