Some Differences in the Responses of Stomata of the Two Leaf Surfaces in Cotton

Some differences in the responses of the upper and lower stomata in cotton (Gossypium hirsutuni) are presented. These differences were observed in the course of some studies in which the transpiration of the two leaf surfaces was measured under controlled environment conditions and the transpiration...

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Bibliographic Details
Published in:Annals of botany 1978-09, Vol.42 (5), p.1141-1147
Main Author: NAGARAJAH, S.
Format: Article
Language:English
Subjects:
Gossypium hirsutum
stomatal responses
transpiration
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Summary:Some differences in the responses of the upper and lower stomata in cotton (Gossypium hirsutuni) are presented. These differences were observed in the course of some studies in which the transpiration of the two leaf surfaces was measured under controlled environment conditions and the transpiration data used as an estimate of stomatal response. In darkness the upper stomata were more or less effectively closed while the lower stomata were partially open. Upon illumination of the leaf with non-saturation or saturation radiation the upper stomata were slower to open than the lower stomata. The reductions in stomatal aperture which occurs with the increase in age of leaves commenced earlier in the upper stomata and proceeded at a faster rate than the lower stomata. Sudden exposure to saturation radiation caused the stomata of the two leaf surfaces to oscillate. These oscillations were not observed in young leaves but in older leaves. During ageing of leaves oscillations of the upper stomata commenced earlier than oscillations of the lower stomata. When the petiole was excised in darkness or light the upper stomata showed a transient increase but not the lower stomata.
ISSN:0305-7364
1095-8290
DOI:10.1093/oxfordjournals.aob.a085554