2005 Fiscal Year Annual Research Report
| Project/Area Number |
17780014
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| Research Institution | Tottori University |
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Principal Investigator |
安 萍 鳥取大学, 乾燥地研究センター, 助教授 (60379659)
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| Keywords | root cell wall / salt tolerance / soybean / pectin / hemicellulose / cellulose / Na+ / transporation |
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| Research Abstract |
This year we focused on the composition of root cell wall in soybean cultivars. We observed that: 1) salinity affected the total amount of root cell wall in both tolerant and sensitive cultivars; 2) there was a general increase in the amount of root cell wall with increasing salt concentration in the culture solution; 3) the amount of root cell wall was greater in tolerant than in sensitive cultivars under non and saline conditions, but the increase in root cell wall after salt treatment was more prominent in sensitive cultivars; 4) the variation in pectin, hemicellulose and cellulose levels in the root cell wall showed a similar trend as total root cell wall. These results indicated that the constituents and amount of the root cell wall varied according to the salt tolerance of the cultivar and salinity affected the metabolism of root cell wall differently in tolerant and sensitive cultivars.
Under moderate salinity, the ratio of the level of pectin to total cell wall was increased in salt tolerant soybean and decreased in salt sensitive cultivars. These results suggested that pectin played an important role in the salt tolerance of soybean during metabolism. Uronic acids in the root cell wall of both cultivars were mostly contained in pectin. There was a general increase in the total amount of uronic acids in the root cell wall of both cultivars with increasing salt concentration in the culture solution, especially in the sensitive cultivar. These results indicated that uronic acids may be related to Na+ transportation from symplast to protoplast.
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