The redox state of the apoplast influences the acclimation of photosynthesis and leaf metabolism to changing irradiance.

ABSTRACT: The redox state of the apoplast is largely determined by ascorbate oxidase (AO) activity. The influence of AO activity on leaf acclimation to changing irradiance was explored in wild-type (WT) and transgenic tobacco (Nicotiana tobaccum) lines containing either high [pumpkin AO (PAO)] or low [tobacco AO (TAO)] AO activity at low [low light (LL); 250 μmol m^-2  s^-1 ] and high [high light (HL); 1600 μmol m^-2  s^-1 ] irradiance and following the transition from HL to LL. AO activities changed over the photoperiod, particularly in the PAO plants. AO activity had little effect on leaf ascorbate, which was significantly higher under HL than under LL. Apoplastic ascorbate/dehydroascorbate (DHA) ratios and threonate levels were modified by AO activity. Desp

SUBMITTER: Karpinska B 

PROVIDER: S-EPMC5947596 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature