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| 名称：
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Dao-Yun Zhang. 2008. Ribulose-1,5-bisphosphate regeneration limitation in rice leaf photosynthetic acclimation to elevated CO2. PLANT SCIENCE. 2008（175）：348-355 |
| 摘要： |
Ribulose-1,5-bisphosphate regeneration limitation in rice leaf photosynthetic acclimation to elevated CO2
Our previous study has demonstrated that both RuBP carboxylation limitation and RuBP regeneration
limitation exist simultaneously in rice grown under free-air CO2 enrichment (FACE, about
200 mmol mol1 above the ambient air CO2 concentration) conditions [G.-Y. Chen, Z.-H. Yong, Y. Liao,
D.-Y. Zhang, Y. Chen, H.-B. Zhang, J. Chen, J.-G. Zhu, D.-Q. Xu, Photosynthetic acclimation in rice leaves to
free-air CO2 enrichment related to both ribulose-1,5-bisphosphate carboxylase limitation and ribulose-
1,5-bisphosphate regeneration limitation. Plant Cell Physiol. 46 (2005) 1036–1045]. To explore the
mechanism for forming of RuBP regeneration limitation, we conducted the gas exchange measurements
and some biochemical analyses in FACE-treated and ambient rice plants. Net CO2 assimilation rate (Anet)
in FACE leaves was remarkably lower than that in ambient leaves when measured at the same CO2
concentration, indicating that photosynthetic acclimation to elevated CO2 occurred. In the meantime the
maximum electron transport rate (ETR) (Jmax), maximum carboxylation rate (Vcmax) in vivo, and RuBP
contents decreased significantly in FACE leaves. The whole chain electron transport rate and
photophosphorylation rate reduced significantly while ETR of photosystem II (PSII) did not significantly
decrease and ETR of photosystem I (PSI) was significantly increased in the chloroplasts from FACE leaves.
Further, the amount of cytochrome (Cyt) f protein, a key component localized between PSII and PSI, was
remarkably declined in FACE leaves. It appears that during photosynthetic acclimation the decline in the
Cyt f amount is an important cause for the decreased RuBP regeneration capacity by decreasing the whole
chain electron transport in FACE leaves. |
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