
TY  - JOUR
A1  - Makino, Amane 
A1  - Harada, Masayo 
A1  - Kaneko, Kentaro 
A1  - Mae, Tadahiko 
A1  - Shimada, Takiko 
A1  - Yamamoto, Naoki 
T1  - Whole-plant growth and N allocation in transgenic rice plants with decreased content of ribulose-1,5-bisphosphate carboxylase under different CO<sub>2</sub> partial pressures
JF  - Functional Plant Biology
JO  - Functional Plant Biol.
Y1  - 2000
VL  - 27
IS  - 1
SP  - 1
EP  - 12
KW  - biomass, elevated CO2, nitrogen allocation, Oryza sativa L, photosynthesis, ribulose-1,5- bisphosphate carboxylase/oxygenase
UR  - https://doi.org/10.1071/PP99094 
N2  - Growth of transgenic rice (Oryza sativa L.) with an antisense gene to the small subunit of Rubisco was analysed under 36 and 100 Pa CO2 during a 14-h photoperiod (1000 mol quanta m&#8211;2 s&#8211;1). Two lines of the antisense plants were used; one with 65% wild-type Rubisco and the other with 40% wild-type Rubisco. The plants were grown hydroponically for 70 d. The final biomass of the antisense plants grown in 36 Pa CO2 was much smaller than that of the wild-type plant. However, several compen-sation phenomena were found in the antisense plants. Increased biomass allocation to leaf blades and preferential N investment in leaf blades were observed. Leaf senescence was also delayed. Elevated CO2 levels up to 100 Pa caused the antisense plants to achieve a size similar to that of the wild-type plant. However, although the antisense plant with 65% wild-type Rubisco was selected as a plant with optimal Rubisco content for CO2 -saturated photosynthesis, its final biomass was not greater than that of the wild-type plant. This may have been caused by a relatively strong Rubisco-antisense effect during the early stage of growth (21&#8211;42 d). N-use efficiency for growth after d 42 was greater in the selected antisense plant. Thus, improvement of N-use efficiency at the level of a single leaf did not necessarily lead to greater production of biomass at the whole-plant level. 
ER  -

