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Citation:

Effects of Sand Burial on Phenotypic Plasticity of Nitraria tangutorum

  • Received Date: 2015-01-11
  • [Objective] To understand the effect of sand burial on the phenotypic plasticity of Nitraria tangutorum,[Method] The cutting shoots of N. tangutorum were treated by sand burial under different depths (0, 5, 10, and 15 cm) and then to analyze the data collected.[Result] (1) With the increase of sand burial depth, the plant height, 15 cm stem diameter, leaf area, the amounts of leaf and adventitious root decreased, and the length or diameter of adventitious root increased at first and then decreased. It was found that when the sand burial depths were 0, 5, 10, and 15 cm, the heights of the plant were respectively 62.82, 55.90, 52.38, and 49.24 cm, the 15 cm stem diameters were respectively 2.79, 2.48, 2.39, and 2.07 mm, the leaf areas were 477.81, 214.38, 247.90, and 112.91 cm2, the amounts of adventitious root were respectively 6.40, 3.80, 2.80, and 3.40, the lengths of adventitious root were respectively 10.19, 11.54, 13.92, 7.62 cm, the diameter of adventitious root were respectively 1.51, 1.95, 1.65, and 1.19 mm. (2) With the increase of sand burial depth, the above-ground biomass and the total biomass decreased, and the length, diameter of adventitious root and the below-ground biomass increased at first and then decreased, the biomass of above-ground/the below-ground biomass first decreased then increased. It was found that when the sand burial depths were 0, 5, 10, and 15cm, the branch biomasses were respectively 6.29, 4.20, 3.09, and 2.75 g, the leaf biomasses were respectively 3.93, 2.52, 3.31, and 1.28 g, the total biomasses were respectively 10.81, 7.53, 7.41, and 4.30 g, the below-ground biomasses were respectively 0.59, 0.81, 0.59, and 0.28 g, the biomass of above-ground/the below-ground biomass respectively is 17.32、8.30、10.85、14.39. (3) The daily averages of net photosynthetic rate, transpiration rate and stomatal conductance of N. tangutorum increased gradually. It was found that when the sand burial depths were 0, 5, 10, and 15 cm, the daily averages of net photosynthetic rate were respectively 8.06, 9.39, 9.72, and 11.25 μmol·m-2·s-1, the daily averages of transpiration rate were respectively 5.56, 6.70, 6.77, and 7.61 mmol·m-2·s-1, the daily averages of stomatal conductance were respectively 0.28, 0.31, 0.31, and 0.36 mol·m-2·s-1. (4) Compared with the CK, the difference of chlorophyll contents of N. tangutorum was not significant. When the depth was 15 cm, the chlorophyll contents of N. tangutorum increased significantly, but the differences of the ratio of the chlorophyll a and Chlorophyll b were not significant.[Conclusion] The phenotypic plasticity of morphology, biomass allocation and photosynthesis of N. tangutorum were greater under different sand burial depth, and when the sand burial depth was 15 cm, the differences of photosynthetic parameters of N. tangutorum responded to different sand burial depth were significant.
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Effects of Sand Burial on Phenotypic Plasticity of Nitraria tangutorum

  • 1. Research Institute of Forestry, Chinese Academy of Forestry
  • 2. Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing 100091, China

Abstract: [Objective] To understand the effect of sand burial on the phenotypic plasticity of Nitraria tangutorum,[Method] The cutting shoots of N. tangutorum were treated by sand burial under different depths (0, 5, 10, and 15 cm) and then to analyze the data collected.[Result] (1) With the increase of sand burial depth, the plant height, 15 cm stem diameter, leaf area, the amounts of leaf and adventitious root decreased, and the length or diameter of adventitious root increased at first and then decreased. It was found that when the sand burial depths were 0, 5, 10, and 15 cm, the heights of the plant were respectively 62.82, 55.90, 52.38, and 49.24 cm, the 15 cm stem diameters were respectively 2.79, 2.48, 2.39, and 2.07 mm, the leaf areas were 477.81, 214.38, 247.90, and 112.91 cm2, the amounts of adventitious root were respectively 6.40, 3.80, 2.80, and 3.40, the lengths of adventitious root were respectively 10.19, 11.54, 13.92, 7.62 cm, the diameter of adventitious root were respectively 1.51, 1.95, 1.65, and 1.19 mm. (2) With the increase of sand burial depth, the above-ground biomass and the total biomass decreased, and the length, diameter of adventitious root and the below-ground biomass increased at first and then decreased, the biomass of above-ground/the below-ground biomass first decreased then increased. It was found that when the sand burial depths were 0, 5, 10, and 15cm, the branch biomasses were respectively 6.29, 4.20, 3.09, and 2.75 g, the leaf biomasses were respectively 3.93, 2.52, 3.31, and 1.28 g, the total biomasses were respectively 10.81, 7.53, 7.41, and 4.30 g, the below-ground biomasses were respectively 0.59, 0.81, 0.59, and 0.28 g, the biomass of above-ground/the below-ground biomass respectively is 17.32、8.30、10.85、14.39. (3) The daily averages of net photosynthetic rate, transpiration rate and stomatal conductance of N. tangutorum increased gradually. It was found that when the sand burial depths were 0, 5, 10, and 15 cm, the daily averages of net photosynthetic rate were respectively 8.06, 9.39, 9.72, and 11.25 μmol·m-2·s-1, the daily averages of transpiration rate were respectively 5.56, 6.70, 6.77, and 7.61 mmol·m-2·s-1, the daily averages of stomatal conductance were respectively 0.28, 0.31, 0.31, and 0.36 mol·m-2·s-1. (4) Compared with the CK, the difference of chlorophyll contents of N. tangutorum was not significant. When the depth was 15 cm, the chlorophyll contents of N. tangutorum increased significantly, but the differences of the ratio of the chlorophyll a and Chlorophyll b were not significant.[Conclusion] The phenotypic plasticity of morphology, biomass allocation and photosynthesis of N. tangutorum were greater under different sand burial depth, and when the sand burial depth was 15 cm, the differences of photosynthetic parameters of N. tangutorum responded to different sand burial depth were significant.

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