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Effect of iron plaque outside roots on nutrient uptake by rice (Oryza sativa L.): Phosphorus uptake 总被引:1,自引:0,他引:1
Under anaerobic conditions, ferric hydroxide deposits on the surface of rice roots have been shown to affect the uptake of
some nutrients. In the present experiment, different amount of this iron plaque were induced on the roots of rice (Oryza sativa
L. cv. TZ88-145) by supplying different Fe(OH)3 concentrations in nutrient solutions, and the effect of the iron plaque on phosphorus uptake was investigated. Results showed
that 1) iron plaque adsorbed phosphorus from the growth medium, and that the amount of phosphorus adsorbed by the plaque was
correlated with the amount of plaque; 2) the phosphorus concentration in the shoot increased by up to 72% after 72 h at concentration
of Fe(OH)3 in the nutrient solution from 0 to 30 mg Fe/L, corresponding with amounts of iron plaque from 0.2 to 24.5 mg g-1 (root d. wt); 3) the phosphorus concentration in the shoots of rice with iron plaque was higher than that without iron plaque
though the concentration in the shoot decreased when Fe(OH)3 was added at 50 mg Fe/L producing 28.3 mg g-1 (root d. wt) of plaque; and 4) the phosphorus concentrations in Fe-deficient and Fe-sufficient rice plants with iron plaque
were the same, although phytosiderophores were released from the Fe-deficient roots. The phytosiderophores evidently did not
mobilise phosphorus adsorbed on plaque. The results suggest that iron plaque on rice plant roots might be considered a phosphorus
reservoir.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献