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| Influence of water stress on the photosynthetic and physiological characteristic of Acanthopanax Senticosus seedings
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| Song Liping,Cai Tijiu,Yu Xiaoli |
| School of Forestry,Northeast Forestry University,150040,Harbin,China |
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Abstract In order to offer scientific base for the artificial cultivation of Acanthopanax Senticosus,the response of photosynthetic pigment,photosynthesis,content of proline and malondialdehyde(MDA) of Acanthopanax Senticosus seedings to soil water stress were studied using a pot cultivation experiment.Four soil water treatment levels were normal growth water condition(CK),mild water stress (T1),moderate water stress(T2),severe water stress(T3).The results showed that content of photosynthetic pigment decreased as the water stress degree was increased,T2 and T3 had the lower content of photosynthetic pigment than CK,T1 did not differ from CK and kept high level.The ratio of chlorophylls to carotenoids in four groups was ranged 3.023.65.In group T1 the seedlings of Acanthopanax Senticosus did not differ from CK in net photosynthesis rate,with the transpiration rate 27.25% lower than that of group CK and the water use efficiency 26.97% higher than that of group CK;In group T2 the seedlings of Acanthopanax Senticosus had lower net photosynthesis rate、transpiration rate and higher water use efficiency than that of group CK,with the net photosynthesis rate decreased 29.46%,the transpiration rate decreased 50.67% and the water use efficiency increased 33.70%;In group T3 the seedlings of Acanthopanax Senticosus had lowest net photosynthesis rate and transpiration rate,but the water use efficiency 77.51% higher than that of group CK.In the whole water treatment period,content of proline and MDA increased as the water stress degree was increased.The results indicated that the Acanthopanax Senticosus seedings could fight a drought,but did not fit the dry soil water condition.
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Received: 27 October 2006
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