The Arabidopsis transgenic lines, TLWT (Twt-1), TLUp1-9 (Tup1-9),
TLUp2-1 (Tup2-1), and TLUp3-2 (Tup3-2) were generated as described
earlier [14]. The transgenic rice lines were obtained by transforming
rice cv. Kitaake [15] with pBIH-LS which contains the potato
AGPase large subunit UpReg-1 (Glu38 to Lys mutation) cDNA [16]
and the transit peptide sequence of the Arabidopsis Rubisco small
subunit (SSU1A-transit) under the control of the Rubisco small subunit
promoter (Supplementary Fig. 1).
Arabidopsis thaliana (L.) Col-0 WT, TL46 and transgenic lines
were grown individually in 1 gallon pots in a controlled environment
chamber with day/night temperatures of 23/18 ◦C under a
12 h photoperiod with a photon flux density of 450 mol m−2 s−1.
After 28 days, plants were transferred to growth chambers at either
370 ppm (ambient) or 1000 ppm CO2 (high). Transgenic rice were
grown in 2 gal pots in a controlled-environment growth chamber
with a 12 h/12 h photoperiod an incident photosynthetic quantum
flux density of 1000 mol m−2 s−1 and a day/night temperature of
26 ◦C/22 ◦C. Leaf gas exchange was measured by means of a FastEst
(Tartu, Estonia) gas exchange system as described [17] using a Li-
6251 CO2 analyzer (Li-Cor, Lincoln, NE). Measurements were made
once steady-state was achieved