| Autor: |
Ze-song, Li, Chu-fu, Zhang, Qing-hua, Lin, Jin, Peng, Chang-jian, Li, Guang-cun, He, Shao-bing, Peng, Bennett, John |
| Zdroj: |
Wuhan University Journal of Natural Sciences; Sep1999, Vol. 4 Issue 3, p358-362, 5p |
| Abstrakt: |
Root biomass of rice seedlings was increased at lower concentration of exogenous NH, but it was decreased at higher concentration of exogenous NH. The level of free NH in the roots was accumulated gradually with the increase of NH concentration in the nutrient solution. The content of the soluble proteins was essentially constant at higher NH. The activities of glutamine synthetase (GS), NADH-dependent glutamate synthase (NADH-GOGAT), and NADH-dependent glutamate dehydrogenase (NADH-GDH) were risen with exogenous NH concentration at the lower NH concentration range. But the activities of GS and NADH-GOGAT were declined, and the level of NADH-GDH activity was kept constant under higher NH concentration. The GS/GDH ratio suggested that NH was assimilated by GS-GOGAT cycle under lower NH concentration, but NADH-GDH was more important for NH assimilation and detoxifying NH to the tissue cells at the higher NH level. According to the growth and the activity changes of these ammonium-assimilating enzymes of rice seedling roots, 10. 0 μg/mL NH-N in nutrient solution was more suitable to the rice growth. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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