节点文献

毛竹(Phyllostachys pubescens)叶光合作用的气孔限制研究

STUDIES ON STOMATAL LIMITATION OF PHOTOSYNTHESIS IN THE BAMBOO (Phyllostachys pubescens) LEAVES

  • 推荐 CAJ下载
  • PDF下载
  • 不支持迅雷等下载工具,请取消加速工具后下载。

【作者】 许大全李德耀邱国雄沈允钢黄启民杨迪蝶C.L.Beadle

【Author】 Xu Da-quan;Li De-yao;Qiu Guo-xiong;Shen Yun-gang;Huang Qi-min;Yang Di-die;C.L.Beadle Shanghai Institute of Plant Physiollogy, Academic Sinica Sub-tropical Forest Research Institute, Chinese Academy of Forestry Science,Zhejiang Fuyang CSIRO Divn. of Forest Research. Australia

【机构】 中国科学院上海植物生理研究所中国林业科学院亚热带林业研究所CSIRO Divn.of Forest ResearchAustralia 浙江富阳浙江富阳

【摘要】 运用Farquhar和Sharkey(1982)提出的两个判据——细胞间隙CO2浓度(Ci)和气孔限制值(Ls),从几个不同的侧面研究了毛竹光合作用的气孔限制。虽然观测到气孔导度(Gs)与光合速率(Pn)随着气温、光量子通量密度的降低和叶水分胁迫的加剧而大体上平行地下降,但是在低的环境温度、低的光量子通量密度和严重的水分胁迫下,气孔导度的下降不是光合速率下降的主要原因,因为这时Ci在上升,而Ls下降。然而,在低的空气湿度和轻微水分胁迫下,Ci的下降和Ls的上升都证明,这时气孔导度的下降是光合速率降低的主要原因。

【Abstract】 Net photosynthetic rate (Pn) measurements were made on the leaves of Phyl-lostachys pubescens using an ADC portable gas analysis system under differentcombinations of air temperature, photon flux density (PFD), air humidity andleaf water potential. Analysis of stomatal limitation of photosynthesis was carriedout with two criteria suggested by Farquhar and Sharkey (1982), i.e., intercellularCO2 concentration (Ci) and stomatal limiting value (Ls), which were,calculatedaccording to Berry and Downton’s method (1982).When air temperature was decreasing from autumn to winter, Pn, stomatalconductance (Gs) and Ls were declining simultaneously, while Ci was increasing.The seasonal changes in these parameters indicated that the decrease in Pn maynot be due to stomatal factor.As air humidity decreased, Pn and Gd declined proportionally, and in themeantime Ci decreased and Ls increased, showing that the decrease in Pn wasdue mainly to the decrease in stomatal conductance.At low PFD the decrease in Pn was accompanied by a decrease in Gs and Ls,and an increase in Ci. In this case Pn was limited obviously by energy supplyrather than by CO2 supply.Leaf Pn and Gs declined sharply after detachment. At first, while waterstress was developing, Ci declined and Ls increased. However, as the water stressbecame severe, Ci began to increase and Ls decreased. It seems that stomatalclosure is the major limiting factor of Pn under mild water stress, but under severewater stress the main limitation of photosynthesis is in the photosynthetic capacityof mesophyll cells.From these results, we conclude that stomatal conductance limits Pn in somecases. However, it is not always the predominant limiting factor of photosynthesisthough parallel changes in Pn and Gs are often observed.

【基金】 联合国环境署(UNEP project FP/4102-83-06 2405);中国科学院基金(850988生85-555)
  • 【被引频次】194
  • 【下载频次】541
节点文献中: 

本文链接的文献网络图示:

本文的引文网络