| 研究実績の概要 |
During the fiscal year of 2017, determination of physical properties (i.e., elasticity, extensibility, viscosity, plasticity) of tomato and wheat were conducted. Salt tolerant and sensitive cultivars of tomato and wheat were examined as experimental materials. The seeds of the two crops were germinated under 0, 40, 80 and 120 mM NaCl conditions. After having significant differences of root length among treatments in each crop, the samples of root tips (0-10 mm) were collected for the measurements of physical properties. Creep Meter was used for the above measurement.
Results showed that salinity decreased the extensibility of the roots, while this decrease was more pronounced in the salt sensitive cultivars as compared to the tolerant cultivars. Root elasticity possessed significantly a positive correlation with the relative amount of pectin in the cell walls. While root viscosity was positively related with the relative amount of hemicellulose I and cellulose in the root cell walls. The root physical properties especially extensibility was well consistent with the root growth of crops under NaCl salinity. These results indicate that chemical and physical characteristics of root cell wall affect the root growth and thus the tolerance of plants under saline conditions.
In the research plan, cotton was listed as experimental material but because the morphology of the cotton roots were changed under the experimental conditions so it was replaced with wheat since wheat is also an important crop of arid land and had similar salt tolerance mechanisms like cotton.
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