+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

The humidity response of stomata and its measurement

Journal of Experimental Botany 38(190): 877-882

The humidity response of stomata and its measurement

Using artificial membranes of constant conductance with vapour pressures below the membranes of 2.33 kPa (saturated) and 2.26 kPa (97% saturated) it was found that an automated water vapour diffusion porometer registered a change in conductance. In other words, it underestimated the conductance when the vapour pressure below the membranes was only 97% saturated. This is because the programmed computation of the conductance assumes that the space below the membrane is at all times saturated. The implications for measuring for measuring leaf conductance with these instruments is discussed in connection with the humidity response of stomata to a stepwise increase in the vapour pressure difference between the leaf interior and the atmosphere. This response appears to involve a lowering of the vapour pressure in the sub-stomatal space and, therefore, a transient opening movement which can be detected by sensitive mass flow porometry. It is concluded that in cases in which a transient opening movement precedes partial stomatal closure the humidity response to an increase in vapour pressure difference cannot be due to vapour loss direct from the guard cells.

Accession: 001709733

DOI: 10.1093/jxb/38.5.877

Download PDF Full Text: The humidity response of stomata and its measurement

Related references

Cuticular conductance and the humidity response of stomata. Journal of Experimental Botany 37(177): 517-525, 1986

Interactions among stomata in response to perturbations in humidity. Plant Cell & Environment 20(9): 1098-1107, 1997

Effect of boundary layer conductance on the response of stomata to humidity. Plant, Cell and Environment 8(1): 55-57, 1985

Response of stomata of pearl millet pennisetum typhoides to atmospheric humidity. Journal of Experimental Botany 30(118): 925-934, 1979

Transgenerational, dynamic methylation of stomata genes in response to low relative humidity. International Journal of Molecular Sciences 14(4): 6674-6689, 2013

The response of stomata of pearl millet (Pennisetum typhoides S. and H.) to atmospheric humidity. Journal of Experimental Botany 30(118): 925-933, 1979

Stomata response to changes in temperature and humidity in wheat cultivars grown under contrasting climatic conditions. RUSSIAN JOURNAL OF PLANT PHYSIOLOGY 54(1): 46-49, 2007

A possible evaporation site in the guard cell wall and the influence of leaf structure on the humidity response by stomata of woody plants. Oecologia (Berlin) 56(1): 30-40, 1983

Differential response of stomata to air humidity in the parasitic mistletoe (Phthirusa pyrifolia) and its host, mandarin orange (Citrus resitulata). Photosynthesis Research 9(3): 333-343, 1986

Studies in stomatal behaviour. II. The role of starch in the light response of stomata. Part 2. The light response of stomata of Allium cepa L., together with some preliminary observations on the temperature response. New Phytol, 51: 30-47. bibl. 24, 1952