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      美國國家科學院消息,研究人員使用基因工程的方法在煙草植株葉綠體中添加了細菌黃素蛋白以考察作物對缺鐵的忍耐力,這是一種還未曾在植物體內發現的含有蛋白質的黃素單核苷酸,可以幫助看出植物缺鐵的征兆并能恢復植物正常的生長和繁殖。研究表明,這種轉基因煙草在缺鐵的條件下仍能正常生長,研究人員認為這是由于細菌黃素蛋白使植株體內有限的鐵含量進行了重新分配的緣故。

      【原文】

      BACTERIAL FLAVOPROTEIN CAN INCREASE PLANT TOLERANCE TO IRON STARVATION 

      Iron starvation in plants is a major concern in agriculture. It causes the decline of many photosynthetic activities and is manifested by chlorotic symptoms in young leaves and poor root formation. This ultimately leads to growth retardation, stasis, and death when disregarded.

      To investigate whether plants can have an increased tolerance to iron deficiency, researchers engineered tobacco plants with bacterial flavodoxin (Fld). Fld is a flavin mononucleotide containing protein that is not found in plants. The compound was shown to counter the symptoms of iron deficit and can restore normal rates of growth and reproduction. 

      Results of the study indicate that transgenic tobacco plants expressing Fld in their chloroplasts grew normally on iron deficient media and did not show decline of photosynthetic components. Previous research has shown that plants with Fld have generalized tolerance to various sources of oxidative and environmental stresses. The researchers explained that the increased tolerance to iron starvation was because Fld permitted the redistribution of the limited amount of available iron to other demanding metabolic pathways, thereby helping the organism.

      The paper published in the Proceedings of the National Academy of Sciences (USA) can be accessed athttp://www.pnas.org/cgi/content/abstract/0704553104v1.  

         (文章來源:美國科學院)

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