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应用生态学报 ›› 2004, Vol. ›› Issue (1): 9-14.

• 研究论文 • 上一篇    下一篇

柚树叶片CO2驯化的光合参数变化

孙谷畴, 赵平, 曾小平, 彭少麟   

  1. 中国科学院华南植物研究所, 广州, 510650
  • 收稿日期:2002-08-13 修回日期:2003-01-27
  • 通讯作者: 赵平
  • 基金资助:
    广东省自然科学基金团队项目(003031);中国科学院知识创新工程领域前沿项目;中国科学院华南植物研究所所长基金资助项目

Variations of photosynthetic parameters in CO2 acclimation of Citrus grandis leaves

SUN Guchou, ZHAO Ping, ZENG Xiaoping, PENG Shaolin   

  1. South China Institute of Botany, Chinese Academy of Sciences, Guangzhou 510650, China
  • Received:2002-08-13 Revised:2003-01-27

摘要: 柚树(Citrus grandis)幼树生长在砂和石至石的生长介质.每周供给0.05mmol P(正常P,P)和0.1mmol P(高磷,2P)的营养液.植株分别生长在空气CO2分压(约39Pa)和倍增CO2分压(81±5Pa)下45d.利用CI-301PS(CID,Inc)光合作用测定系统在较高光强(1150μmol·m-2·s-1)下测定叶片光合速率并得出的Pn-Pi关系曲线和在较高CO2分压(PCO2,56Pa)下得出Pn-PAR关系曲线计算有关光合参数.结果表明,大气CO2分压下2P植株最大光合速率较P植株高13.3%,倍增CO2分压下,无论P或2P植株最大光合速率较大气CO2分压下相应植株低,但在倍增CO2分压下2P植株较P植株高.且2P植株有较P植株高的表观量子产率和光能利用效率(P<0.05),但并不改变Γ*、Rd和Rubisco羧化速率(Vc)和氧速率的比率(P>0.05).在大气CO2分压下2P植株的Vcmax和Jmax较P植株分别高8.3%和12.5%.在倍增CO2分压下2P植株的Vcmax和Jmax均较P植株高.柚树在高CO2驯化中改变叶N在Rubisco和捕光组分分配系数,但不改变叶N在光合电子传递链的分配系数,结果表明,增加P供给可以促进高CO2分压下光合碳循环中P的周转,提高倍增CO2分压下植株的光合速率.调节柚树叶片的CO2驯化的光合参数.

关键词: 柚树, 磷供给, 空气CO2分压倍增, 光合参数

Abstract: Plastic pots with sand and vermiculite were used to grow Citrus grandis saplings,and 0.05mmol P (normal P level,P) and 0.1 mmol P (higher P level,2P) nutrient solution were supplied every week. The saplings were grown under atmospheric CO2 (about 39 Pa) and doubled CO2 partial pressure (81±5Pa) for 45d. The Pn-Pi curve was measured under higher irradiation (1150 μmol·m-2 ·s-1) by CI-301PS Photosynthesis System (CID,Inc),and the Pn-PAR curve was measured under higher CO2 partial pressure (PCO2 56 Pa).The results showed that the maximum rate of photosynthesis for 2P plants was 13.3% higher than that of P plants under atmospheric CO2 partial pressure. Regardless of P and 2P plants,the maximum photosynthetic rate under doubled CO2 partial pressure was lower than that under atmospheric CO2 partial pressure,but the photosynthetic rate of 2P plants was higher than that of P plants under doubled CO2 partial pressure. 2P plants had a higher apparent quantum efficiency and light energy conversion efficiency (P<0.05) than P plants,but no change in Γ*,Rd and the ratio between carboxylation rate (Vc) and oxygenation rate (Vo) of Rubisco (P>0.05) wwere found. The Vcmax and Jmax of 2P plants were 8.3% and 12.5% higher than those of P plants under atmospheric CO2 partial pressure,respectively,and 2P plants also had higher Vcmax and Jmax than P plants under double CO2 partial pressure. The partitioning coefficient of leaf nitrogen in Rubisco and in thylakoid light-harvesting component was varied in CO2 acclimation,but it was not in bioenergetics.It may suggest that an increasing phosphorus supply would promote the phosphorus turnover in photosynthetic carbon cycle,and increase the photosynthetic rate under doubled CO2 partical pressure.Increaing phosphorus supply may be a way to regulate the photosynthetic parameter of plants in CO2 acclimation.

Key words: Citrus grandis, Phosphorus supply, Doubled CO2 partial pressure, Photosynthetic parameter

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