Discussão:Estômato
Origem: Wikipédia, a enciclopédia livre.
Favor verificar a veracidade das informações referentes ao mecanismo de abertura dos estômatos. Suspeito que o consumo do C02 não aumente o pH, mas sim diminua, uma vez que o C02 reage com a água formando o ácido carbônico (H2CO3).
da en.wiki (talvez com isto se possa esclarecer):
However, most plants do not have the above-said facility and must therefore open and close their stomata during the daytime in response to changing conditions, such as light intensity, humidity, and carbon dioxide concentration. It is not entirely certain how these responses work. However, the basic mechanism involves regulation of osmotic pressure.
When conditions are conducive to stomatal opening (e.g., high light intensity and high humidity), a proton pump drives protons (H+) from the guard cells. This means that the cells' electrical potential becomes increasingly negative, and so an uptake of potassium ions (K+) occurs. This in turn increases the osmotic pressure inside the cell, drawing in water through osmosis. This increases the cells' volume and turgor pressure. Then, because the wall of the guard cell facing the stomatal pore is less elastic (more rigid) than the wall on the opposite side of the cell, the two guard cells bow apart from one another, creating an open pore through which gas can move.
Lijealso 
msg 21:01, 27 Dezembro 2005 (UTC)
Sem dúvida o aumento do CO2 diminui o pH do meio, assim, quando existe consumo de CO2, o pH diminui o estoma FECHA (é o que ocorre na maioria das plantas à noite). Roxinhamsg 18:25, 2 Abril 2007 (UTC)
