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Article Addendum
Long-distance signaling of iron deficiency in plants
Yusuke Enomoto and Fumiyuki Goto
volume 3 | issue 6
june 2008Pages: 396 - 397
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In a recent issue of the Planta, we established two points regarding the long-distance signal of iron status in tobacco (Nicotiana tabacum L.). One is that the long-distance signal generated in iron deficient tissues is a major factor in positively regulating the expressions of iron uptake genes in tobacco. The expression of a ferric chelate reductase gene (NtFRO1) and an iron-regulated transporter gene (NtIRT1) in roots decreased by cutting off the leaves grown under the iron-deficient condition. Conversely, the leaf-excision did not cause upregulation of the genes under the iron-sufficient condition. These results indicated that signals sent from shoots regulate iron uptake in roots under the iron-deficient condition. The second point regarding the long-distance signals is that the strength of the long-distance signals depends on the size of plant including roots. Both genes expressed in proportion to the weight of the remaining leaves, until a certain threshold. The gene expressions were observed also in hairy roots cultured under the iron deficient condition. In this paper, we discuss the long distance signals of iron status in plants, using a newly obtained data.
Authors
Yusuke Enomoto
Central Research Institute of Electric Power Industry; Abiko-shi, Japan
Fumiyuki Goto
Central Research Institute of Electric Power Industry; Abiko-shi, Japan