Auxin-induced acidification is not due to the hydration of respiratory CO2 Article

Oberbauer, S, Rayle, D, Johnson, K et al. (1978). Auxin-induced acidification is not due to the hydration of respiratory CO2 . 11(3-4), 317-322. 10.1016/0304-4211(78)90017-2

cited authors

  • Oberbauer, S; Rayle, D; Johnson, K; Cleland, R

authors

abstract

  • Sloane and Sadava, in 1975, proposed that auxin-induced cell wall acidification is largely due to carbonic acid derived from respired CO2. In this paper we show that the pH values calculated by Sloane and Sadava from measured CO2 concentrations do not agree with either theoretical or measured pH values. In addition we show that in an open beaker system the speed with which CO2 escapes to the atmosphere is too rapid to allow any substantial accumulation of carbonic acid. Lastly, vigorous bubbling with N2 of the acidified medium surrounding auxin-treated pea stem segments does not cause a substantial increase in the pH of the medium. For these reasons we feel that the hypothesis which states that growth-regulator-enhanced wall acidification arises largely from the hydration of respiratory-derived CO2 is disproved. © 1978.

publication date

  • January 1, 1978

Digital Object Identifier (DOI)

start page

  • 317

end page

  • 322

volume

  • 11

issue

  • 3-4