Photosynthetic Recovery of a Perennial Grass Leymus chinensis after Different Periods of Soil Drought

• XU Zhen-Zhu

  Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Science

• ZHOU Guang-Sheng

  Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Science

抄録

The effects of rewatering after different periods of soil drought stress on the photosynthetic capacity of Leymus chinensis in pots were investigated. The plants were subjected to short-term (10-d), moderate-term (20-day) and long-term (30-d) drought each followed by rewatering. Control plants were well watered during the experimental periods. The long-term water stress without rewatering decreased the chlorophyll content, Chl a/b ratio, carbonic anhydrase (CA) activity, net photosynthetic rate (A), and leaf area compared with the control. Rewatering increased the ratio of Chl a/b, CA activity and A, but decreased the leaf area and ion leakage from the cut leaf pieces. The long-term water stress without rewatering reduced the maximal efficiency of PSII (F_v/F_m), the actual quantum yield (Φ_p), and photochemical quenching (q_p), but these values were increased by rewatering to more than the control level, though non-photochemical quenching (q_N) was decreased as compared with the control. This implied that long-term drought aggravated PSII, but rewatering improved it. The net CO_2-exchange rate showed similar diurnal changes in all treatments, but the rate in the morning was lower in long-term drought (before rewatering) than in the other treatments. These results suggest the photosynthesis of Leymus chinensis may be well adapted to episodical soil drought.

収録刊行物

• Plant production science

  Plant production science 10 (3), 277-285, 2007-09-01

  日本作物学会

キーワード

• Carbonic anhydrase
• Chlorophyll fluorescence
• Drought adaptation
• Gas exchange
• Leymus chinensis (Trin.) Tzvel.
• Rewatering

詳細情報

• CRID: 1574231877029368960
• NII論文ID: 110006344188
• NII書誌ID: AA11162156
• ISSN: 1343943X
• 本文言語コード: en
• データソース種別:
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