Increase of maximum photosynthetic rates in plants acclimated to high light compared to nonacclimated plants

Range ~38±4 %
Organism Thale cress Arabidopsis thaliana
Reference Ma F, Jazmin LJ, Young JD, Allen DK. Isotopically nonstationary 13C flux analysis of changes in Arabidopsis thaliana leaf metabolism due to high light acclimation. Proc Natl Acad Sci U S A. 2014 Nov 25 111(47):16967-72. doi: 10.1073/pnas.1319485111. p.16968 left column 3rd paragraphPubMed ID25368168
Method Abstract: "[Investigators] performed in vivo isotopic labeling of Arabidopsis thaliana rosettes with (13)CO2 and estimated fluxes throughout leaf photosynthetic metabolism by INST-MFA [Isotopically nonstationary metabolic flux analysis]. Plants grown at 200 µmol m^(-2)s^(-1) light were compared with plants acclimated for 9 d at an irradiance of 500 µmol⋅m^(-2)⋅s^(-1)."
Comments P.16968 left column 3rd paragraph: "Plant Development and Photosynthetic Rates: Developmental stages and photosynthetic metabolism are closely linked. Leaf morphology, pigmentation, photosynthetic rate, enzyme activities, and carbon partitioning impact plant development. In turn, the expansion of leaves, development of reproductive sink, and leaf senescence influence photosynthesis (ref 30). Leaves of 3- to 5-wk-old Arabidopsis plants had comparable amounts of chlorophyll per unit of leaf fresh weight (FW) and net photosynthetic rates per unit of leaf area, however, RuBisCO content per unit FW decreased with age (Fig. 1, Inset), and 5-wk-old plants exhibited flower development. Fully expanded leaves of 4-wk-old plants were selected for all further experiments. Light–response curves (Fig. 1) indicated that plants acclimated to high light have ∼38 ± 4% greater maximum photosynthetic rates than nonacclimated plants (measured at ∼2,000 µmol×m^−2×s^−1) and an altered ratio of chlorophyll a/b (Fig. S1)."
Entered by Uri M
ID 113451