Sulfur Stable Isotope Discrimination in Rice: A Sulfur Isotope Mass Balance Study.

ABSTRACT: The use of sulfur (S) stable isotopes to study S metabolism in plants is still limited by the relatively small number of studies. It is generally accepted that less S stable isotope discrimination occurs during sulfate (SO₄ ^2-) uptake. However, S metabolism and allocation are expected to produce separations of S stable isotopes among the different plant S pools and organs. In this study, we measured the S isotope composition of the main S pools of rice plants grown under different SO₄ ^2- availabilities in appropriate closed and open hydroponic-plant systems. The main results indicate that fractionation against ³⁴S occurred during SO₄ ^2- uptake. Fractionation was dependent on the amount of residual SO₄ <

SUBMITTER: Cavallaro V 

PROVIDER: S-EPMC8960986 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature