大气CO2浓度升高对香蕉光合作用及光合碳循环过程中叶氮分配的影响

摘要/Abstract

摘要： 生长在高CO₂浓度(700±5μl·L^-1)1周的香蕉叶片,其光合速率(Pn,μmol·m^-2·s^-1)为5.14±0.32,较生长在大气CO₂浓度(356±301μl·L^-1)的高22.1%,而生长在较高CO₂浓度下8周,叶片Pn较生长在大气CO₂浓度的低18.1%,表现香蕉叶片对较长期高CO₂浓度的驯化和光合作用抑制.生长在高CO₂浓度的香蕉叶片有较低光下呼吸速率(R_d),而不包括光下呼吸的CO₂补偿点则变幅较小.最大羧化速率(Vcmax)和电子传递速率(J)分别较生长在大气CO₂浓度的低30.5%和14.8%,根据气体交换速率计算的表观量子产率(α,mol CO₂·mol^-1光量子),生长在较高CO₂浓度下8周的叶片为0.014±0.01,而生长在大气CO₂浓度下的为0.025±0.005.较高CO₂浓度下叶片的表观量子产率降低44%.光能转换效率electrons·quanta^-1)亦从0.203降低至0.136.生长在较高CO₂浓度下香蕉叶片的叶氮在Rubicos分配系数(PR)、叶氮在生物力能学组分分配系数(P_B)和叶氮在光捕组分的分配系数(P_L)均较生长在大气CO₂浓度低,表明在高CO₂浓度下较长期生长(8周)的香蕉叶片多个光合过程受抑制,光合活性明显降低.

关键词: 香蕉, 高CO₂浓度, 光合速率, 叶N分配

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.

Key words: Musa paradisiaca, Higher CO₂ concentration, Photosynthetic rate, Leaf nitrogen partition

中图分类号:

Q949

孙谷畴, 赵平, 曾小平, 彭少麟. 大气CO₂浓度升高对香蕉光合作用及光合碳循环过程中叶氮分配的影响[J]. 应用生态学报, 2001, (3): 429-434.

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.

参考文献

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大气CO₂浓度升高对香蕉光合作用及光合碳循环过程中叶氮分配的影响

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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