EurekaMag.com logo
+ Site Statistics
References:
47,893,527
Abstracts:
28,296,643
+ 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

Meidner H., 1986: Cuticular conductance and the humidity response of stomata. Detailed measurements of cuticular vapour loss from leaves of several species [Prunus laurocerasus, Pinus, Aur, Ulmus, Hedera] showed that cuticular conductance declined from an early morning maximum of 0.02 cm s-1 to between 0.004 and 0.005 cm s-...

Mott, K.A.; Denne, F.; Powell, J., 1997: Interactions among stomata in response to perturbations in humidity. The existence of patchy stomatal closure suggests interactions among neighbouring stomata that synchronize stomatal movements in small areas of a leaf. To test for such interactions, water vapour partial pressure (e-wv) for a small group of stomat...

Bunce, J.A., 1985: Effect of boundary layer conductance on the response of stomata to humidity. Leaf conductance responses to the water vapour partial pressure difference (VPD) between leaf and air were measured at air speeds of 0.5 and 3.0 m/s in single attached leaves of soyabeans, Abutilon theophrasti and Datura stramonium to test the hyp...

Squire G.R., 1979: Response of stomata of pearl millet pennisetum typhoides to atmospheric humidity. Canopy conductance of irrigated and unirrigated pearl millet plants was measured with a diffusive resistance porometer in a field experiment in Central India. When plants were growing in a drying soil, canopy conductance was related linearly to th...

Tricker, P.J.; López, C.M.Rodríguez.; Gibbings, G.; Hadley, P.; Wilkinson, M.J., 2013: Transgenerational, dynamic methylation of stomata genes in response to low relative humidity. Transgenerational inheritance of abiotic stress-induced epigenetic modifications in plants has potential adaptive significance and might condition the offspring to improve the response to the same stress, but this is at least partly dependent on t...

Squire, G.R., 1979: The response of stomata of pearl millet (Pennisetum typhoides S. and H.) to atmospheric humidity. Canopy conductance of irrigated and unirrigated pearl millet plants was measured with a diffusive resistance porometer in a field experiment near Hyderabad, central India. When plants were growing in a drying soil, canopy conductance was related l...

Kudoyarova, G.R.; Veselov, D.S.; Faizov, R.G.; Veselova, S.V.; Ivanov, E.A.; Farkhutdinov, R.G., 2007: Stomata response to changes in temperature and humidity in wheat cultivars grown under contrasting climatic conditions. Stomatal response to changes in temperature and humidity was studied in wheat (Triticum aestivum L.) cv. Iren' cultivated under conditions of high water supply and cv. Kazakhstanskaya 10, which is relatively drought tolerant. Experiments wer...

Appleby R.F.; Davies W.J., 1983: A possible evaporation site in the guard cell wall and the influence of leaf structure on the humidity response by stomata of woody plants. Gas exchange measurements made with single leaves from Wych elm (Ulmus glabra Huds.), Lombardy poplar (Populus nigra 'Italica' L.) and common oak (Quercus robus L.) seedlings grown at high irradiance showed significant interspecific diff...

El-Sharkawy, M.A.; Cock, J.H.; Del Pilar Hernandez, A., 1986: Differential response of stomata to air humidity in the parasitic mistletoe (Phthirusa pyrifolia) and its host, mandarin orange (Citrus resitulata). Measurements of CO2 and H2O exchange rate and the calculated leaf conductance of attached leaves were conducted over a range of leaf-to-air vapour pressure difference (VPD) (1.5 to 5.5 kPa) to compare the response of the parasitic mistletoe, Phthi...

E.S.arkawy M.A.; Cook J.H.; Del Pilar Hernandez A., 1986: Differential response of stomata to air humidity in the parasitic mistletoe phthirusa pyrifolia and its host mandarin orange citrus reticulata. Measurements of CO2 and H2O exchange rate and the calculated leaf conductance of attached leaves were conducted over a range of leaf-to-air vapour pressure difference (VPD) (1.5 to 5.5 kPa) to compare the response of the parasitic mistletoe, Phthi...