Staged Responses of Non-structural Carbohydrates of Pinus tabulaeformis Seedlings to Drought Stress

doi:10.7525/j.issn.1673-5102.2018.03.019

Abstract

Abstract: The experiment was conducted to study the effect of drought on non-structural carbohydrates(NSC) of Pinus tabulaeformis and its response mechanism, with 2-a P. tabulaeformis seedlings, we set four different water treatments including suitable water, light, moderate and serious drought stress, i. e., 80%, 60%, 40% and 20% of the field capacity. We compared the variations of NSC in different organs under different drought stress times(15, 30, 45 and 60 d). There were significant interacting effects between drought stress degree and duration on the contents of soluble sugar, starch and total NSC in current-year-old needles, 1-a needles, stems, coarse roots and fine roots of P. tabulaeformis seedlings. On the 15th day of treatment, NSC contents in current-year-old needles under drought stress were significantly lower than that under suitable water condition. Moreover, NSC content in fine roots under light and serious drought stress treatments was significantly higher than that in suitable water treatment. On the 45th day of treatment, the starch content in current-year-old needles, one-year-old needles, stems, coarse roots and fine roots increased with the increasing of drought stress degree. On the 60th day of treatment, the starch content in fine roots was declined with the increasing of stress degree, and the soluble sugar and total NSC contents in fine roots under the drought stress treatment were significantly lower than those in suitable water treatment. These findings indicated that NSC firstly supplied to roots to promote water uptake in the early stage of drought stress. However, downward translocation of NSC was inhibited, and growth and absorption ability of root decreased under long term stress. The findings of staged strategies of NSC for drought stress should provide data support for the choice of the optimum afforestation time and water management of P. tabulaeformis seedlings in Northeast China.

Key words: soluble sugar, starch, non-structural carbohydrates, adaptive strategy, plant organs

CLC Number:

S791.254

WANG Zong-Yan, WANG Kai, JIANG Tao, CAO Peng, SUN Ju, WANG Dao-Han. Staged Responses of Non-structural Carbohydrates of Pinus tabulaeformis Seedlings to Drought Stress[J]. Bulletin of Botanical Research, 2018, 38(3): 460-466.

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