Influence of elevated atmospheric CO2 concentration on photosynthesis and leaf nitrogen partition in process of photosynthetic carbon cycle in Musa paradisiaca

Abstract

Abstract: The photosynthetic rate (Pn) in leaves of Musa paradisiaca grown under elevated CO₂ concentration (700±56μl·L^-1 ) for one week was 5.14±0 32μmol·m^-2 ·s^-1,22.1% higher than that under ambient CO₂ concentration,while under elevated CO₂ concentration for 8 week,the Pn decreased by 18.1%.It can be inferred that the photosynthetic acclimation to elevated CO₂ concentration and the Pn inhibition occurred in leaves of M.paradisiaca.The respiration rate in light (Rd) was lower in leaves under higher CO₂ concentration,compared with that under ambient CO₂ concentration.If the respiration in light was not included,the difference in CO₂ compensation point for the leaves of both plants was not significant.Under higher CO₂ concentration for 8 weeks,the maximum carboxylation rate(Vcmax)and electron transportation rate (J) in leaves decreased respectively by 30.5% and 14.8%,compared with that under ambient CO₂ concentration.The calculated apparent quantum yield (α) in leaves under elevated CO₂ concentration according to the initial slope of Pn/PAR was reduced to 0.014±0.010 molCO₂·mol^-1 quanta,compared with the value of 0.025±0.005molCO₂·mol^-1 quanta in the control.The efficiency of light energy conversion also decreased from 0.203 to 0.136 electrons·quanta^-1 in plants under elevated CO₂ concentration.A lower partitioning coefficient for leaf nitrogen in Rubisco,bioenergetics and thylakoid light harvesting components was observed in plants under higher CO₂ concentration.The results indicated that the multi process of photosynthesis was suppressed significantly by a long term(8 weeks) higher CO₂ concentration incubation.

CLC Number:

Q949

SUN Guchou, ZHAO Ping, ZENG Xiaoping, PENG Shaolin. Influence of elevated atmospheric CO₂ concentration on photosynthesis and leaf nitrogen partition in process of photosynthetic carbon cycle in Musa paradisiaca[J]. Chinese Journal of Applied Ecology, 2001, (3): 429-434.

References

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Influence of elevated atmospheric CO₂ concentration on photosynthesis and leaf nitrogen partition in process of photosynthetic carbon cycle in Musa paradisiaca

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