Effect of Salt Stress on Photosynthetic Diurnal Variation of Fraxinus chinesis andPopulus simonii×P.euphrati Seedlings(PDF)

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Title:: Effect of Salt Stress on Photosynthetic Diurnal Variation of Fraxinus chinesis andPopulus simonii×P.euphrati Seedlings

Author(s):: LIU Ping¹; PAN Wen-li²; WEI Zhong-ping²; WANG Yu-tao¹; 1. College of Forestry, Shenyang Agricultural University, Shenyang, Liaoning 110866;
?2. Liaoning Provincial Research Institute of Forestry Science, Shenyang, Liaoning 110032

Keywords:: salt stress; photosynthetic rate; transpiration rate; water use efficiency

Abstract:: The Fraxinus chinesis and Populus simonii×P.euphrati seedlings were used as experimental material to study the effect of salt stree on the photosynthetic diurnal variation. The results showed that the photosynthetic rate, transpiration rate, stomatal conductance diurnal variation of Fraxinus chinesis showed a single peak type, while Populus simonii×P.euphrati was double peak type under mild salt stress. The maximum value of photosynthetic rate of Fraxinus chinesis and Populus simonii×P.euphrati Seedlings all appeared at 8:00~10:00, the maximum value were CO₂9.4364 μmol?m^-2.?s^-1. and CO₂16.304 μmol?m^-2.?s^-1. respectively, but the water use efficiency were close. In moderate salt stress, the photosynthetic rate diurnal variation of Fraxinus chinesis was double peak type, while Populus simonii×P.euphrati was single peak type. The maximum value of photosynthetic rate of Fraxinus chinesis seedlings appeared at 8:00~10:00, while Populus simonii×P.euphrati seedlings appeared at 14:00~16:00. The maximum photosynthetic rate of Fraxinus chinesis was CO₂5.6575 μmol?m^-2.?s^-1. decreased 40% than that of mild salt stree, the maximum photosynthetic rate of Populus simonii×P.euphrati seedlings was CO₂4.352 μmol?m^-2.?s^-1. decreased 73.3% than that of mild salt stree, but the water use efficiency also were close.

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Last Update: 2014-08-23