水稻田稗草叶片光合作用对开放式空气CO2浓度增高(FACE)的适应

摘要/Abstract

摘要： 于分蘖、拔节和抽穗3个时期在空气CO₂浓度(380μmol·mol^-1)下测定稻田中稗草叶片的净光合速率(Pn),发现在开放式CO₂浓度增高(FACE)条件下生长的稗草叶片后2个时期的Pn显著低于普通空气中生长的对照,比对照下降约20%,说明FACE条件下稗草叶片光合作用对高CO₂浓度发生了明显的适应.同时,叶片的气孔导度(Gs)和胞间CO₂浓度(Ci)的下降更为明显.与对照相比,叶片可溶性蛋白含量明显降低,拔节期只有对照的62.4%;高CO₂浓度下生长的稗草叶片Rubisco含量也降低,分蘖期和拔节期分别为对照的87%和84%,但其差异未达到显著水平.可以认为,长期生长在高CO₂浓度下的C₄植物稗草叶片光合作用的适应是叶片气孔部分关闭和可溶性蛋白含量下降的结果.

关键词: FACE, C₄植物, 稗草, 光合作用, 适应, 气孔导度, 高程, 降水, 氢氧稳定同位素, 过量氘, 水温

Abstract: Acomparative study was made between the leaves of Echinochloa crusgalli grown at 580 (FACE) and 380 (control, ambient air) μmol CO₂ mol^-1 air by observation of net photosynthetic rates (Pn) and the contents of soluble protein and the key enzyme of photosynthetic carbon assimilation, Rubisco. When measured at the ambient air CO₂ concentration (380 μmol·mol^-1 ), Pn were significantly lower in leaves grown under FACEconditions than that in those leaves grown in the ambient air.This indicates that photosynthetic acclimation to high CO₂ occurs in the leaves grown under FACEconditions. Also,the stomatal conductance (Gs) and intercellular CO₂ concentration (Ci) were decreased significantly in the leaves grown under FACE. The content of total soluble protein was much lower in the leaves grown under FACEconditions than that in the control, and the content of Rubisco was also decreased in the FACEleaves, but the difference was not significant.From these results it is deduced that the photosynthetic acclimation to high CO₂ in Echinochloa crusgalli leaves grown under FACEconditions is mainly related to the partial closure of stomata and the decrease in soluble protein containing some enzymes.

Key words: precipitation, altitude, deuterium excess, water temperature, hydrogen and oxygen stable isotopes

中图分类号:

Q945.11

陈根云, 廖轶, 蔡时青, 曾青, 朱建国, 韩勇, 刘钢, 许大全. 水稻田稗草叶片光合作用对开放式空气CO₂浓度增高(FACE)的适应[J]. 应用生态学报, 2002, (10): 1201-1204.

CHEN Genyun, LIAO Yi, CAI Shiqing, ZENG Qing, ZHU Jianguo, HAN Yong, LIU Gang, XU Daquan. [J]. Chinese Journal of Applied Ecology, 2002, (10): 1201-1204.

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水稻田稗草叶片光合作用对开放式空气CO₂浓度增高(FACE)的适应

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