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Iron is one of the essential trace elements of the plant, an irreplaceable plant life activities, participate in many important enzymatic reaction and the process of photosynthesis, respiration and other electron transfer. Although containing a sufficient amount of iron in the soil, but mostly iron exists in the form of an insoluble compound, combined with the mobility of the iron in plants is small, resulting in global plant iron deficiency anemia green and human disease. How to improve the plant activation and utilization of iron, reinforced iron a useful metabolic processes in plants the proven adaptation and regulation mechanisms of plants to iron deficiency, has an important academic significance, scholars of current studies of plant nutrition hot spots. Plant NO (nitric oxide, NO) is the current hot spots, at home and abroad in recent years, a large number of studies have shown that nitric oxide has an important role in the regulation of plant growth and development, such as those affecting seed germination, leaf expansion, participation in the etiolated seedlings off yellow and in vivo oxidation-reduction reaction, etc., has been recognized as a new signaling molecules in plants. NO as a signaling molecule, a very close relationship with iron metabolism. Of NO, however, not affect the study of the adjustment of the Iron Deficiency plant iron metabolism and iron, nitric oxide, antioxidant system among relations, this is the argument basis and research focus of this paper. Material of iron deficiency pea seedlings to sodium nitroprusside (SNP), a NO-releasing agent, NO pea iron metabolism adjustment. The results showed that NO promote the pea seedling shoot development, improve the crown-to-root ratio, promote root elongation and lateral root development, NO also changed the pea seedlings caused by iron deficiency and iron toxicity antioxidant system changes. With the intensification of iron deficiency, exogenous nitric oxide so that the roots of SOD, CAT, APX activity increased significantly. And pea seedling roots MDA, the O 2 , H 2 O 2 decreased. These results indicate that NO through its iron nutritional status and body iron homeostasis improve and enhance the antioxidant capacity of iron deficiency pea seedlings. This experiment also measured iron Stress exogenous NO and exogenous NO, ferric reductase activity. Prove different concentration of iron processing will change the pea seedling roots activity of ferric reductase activity, along with iron and high-speed rail intensification of enzyme activity rising. But exogenous nitric oxide ferric reductase activity can be improved, so that it is maintained at normal physiological levels.
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