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Invertase and Adaptability of Physiological Accommodation under Salinity Stress in Tomato Seedling

Author: GaoZuo
Tutor: ChengZhiHui
School: Northwest University of Science and Technology
Course: Olericulture
Keywords: tomato hydroponic culture salinity stress invertase carbohydrate metabolism
CLC: S641.2
Type: Master's thesis
Year: 2006
Downloads: 245
Quote: 1
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Abstract


The effects of salinity stress at the levels of 50, 100, 200, 400, 800, 1600, 3200 mg.L-1 of NaCl on morphological indexes,physiological indexes such as invertase expression and carbohydrate metabolism in tomato (cv. Zhongza No. 9) seedlings were studied under hydroponic culture. One purpose of the study was to find the condign salinity stress .The results were showed as follows.Plant height and relative plant height were increased, stem thickness and index of seedling growth were decreased with the strength of salinity stress under 50, 100, 200, 400, 800, 1600, 3200 mg.L-1of NaCl treatment, respectively during salinity stress. The invertase expression in both roots and leaves was closely related to both the strength and the duration of salinity stress.The apoplastic and the soluble acid invertases expressed remarkably under salinity stress. Invertases in roots and leaves were increased under 400 mg.L-1 of NaCl treatment several days after stress. The invertases were increased under 50, 100 and 200 mg.L-1 of NaCl treatment and decreased under 800, 1600 and 3200 mg.L-1 of NaCl treatment with the strength of salinity stress in different stress days. The increases of glucose, fructose and sucrose in leaves were corresponding to the trend of leave invertases expression. The increasing degrees of glucose, fructose were increased with the strength and the duration of salinity stress. The increasing degrees of glucose, fructose were maximum and sucrose was lower than glucose, fructose under 400 mg.L-1 of NaCl treatment in the duration of stress. The increasing degrees of starch were increased with the strength of stress. The increasing degree of starch by 400 mg.L-1 treatment was lower than that of other treatments, remarkably.In the indoor experiment with low salinity stress, water potential of tomato leaf was increased firstly from the 3th days and then decreased from the 11th days. The decreasing degrees became slow with the strength of salinity stress, considering the plants under 400 mg.L-1 of NaCl treatment were likely to recover normal physiological metabolism if the stress was removed then. The photosynthetic pigment increased along with the duration of salinity stress .The decrease trend of stomata conductance was related to the strength of salinity stress, and had the linear correlation with transpiration rate. The change of stomata conductance directly effected on the net photosynthetic rate.The chlorophyll fluorescence parameters changed in regular trend in some degrees. For example, the increasing degrees of Fv/Fm、Fv/Fo were increased with the strength of salinity stress (the 9th day after treatment), the increasing degree of Fo were decreased and the net photosynthetic rate had a certain increase. The qN was increased with the strength of salinity stress in the duration of stress.

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CLC: > Agricultural Sciences > Gardening > Vegetable gardening > Solanaceous > Tomatoes ( tomatoes )
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