地上部ジベレリンによる根の機能制御  [in Japanese] Control of root functions by shoot-derived gibberellin  [in Japanese]

<p>In plants, long-distance signaling acts as one of the mechanisms for adaptation to environmental change and growth regulation to maintain a balance between distanced organs.　Many studies suggest that gibberellins （GAs） behave as long-distance transmitters.　GA precursors can move through vascular system.　This review focuses on the functions of GA signaling between shoot and root.　Root-expressed genes which responding to shoot-derived GAs were identified by microarray analysis in <i>Arabidopsis</i>.　Two GA-responding genes （1） IRT1 （Iron Regulated-Transporter 1） and （2） CLE6 （CLAVATA/ESR-RELATED 6） have been identified.　IRT1 plays a key role in Fe absorption into root cells from soil.　GA promotes the gene expression of <i>IRT1</i> and Fe absorption in root.　GAs would be signal transmitters for the acquirement of essential nutrients such as Fe.　CLE6 belongs to peptide hormones.　Expression of <i>CLE6</i> in root is found in vascular tissue and endodermis and promoted by shoot-derived GAs.　Phenotype of GA deficient mutant shows partial recovery recovered by grafting with <i>CLE6</i> overexpression transgenic line.　<i>CLE6</i> is up-regulated by GAs and acts as long-distance signal for organ growth.　In conclusion, mentioned GA functions are considered essential for information exchange between shoot and root.</p>

<p>In plants, long-distance signaling acts as one of the mechanisms for adaptation to environmental change and growth regulation to maintain a balance between distanced organs.　Many studies suggest that gibberellins （GAs） behave as long-distance transmitters.　GA precursors can move through vascular system.　This review focuses on the functions of GA signaling between shoot and root.　Root-expressed genes which responding to shoot-derived GAs were identified by microarray analysis in <i>Arabidopsis</i>.　Two GA-responding genes （1） IRT1 （Iron Regulated-Transporter 1） and （2） CLE6 （CLAVATA/ESR-RELATED 6） have been identified.　IRT1 plays a key role in Fe absorption into root cells from soil.　GA promotes the gene expression of <i>IRT1</i> and Fe absorption in root.　GAs would be signal transmitters for the acquirement of essential nutrients such as Fe.　CLE6 belongs to peptide hormones.　Expression of <i>CLE6</i> in root is found in vascular tissue and endodermis and promoted by shoot-derived GAs.　Phenotype of GA deficient mutant shows partial recovery recovered by grafting with <i>CLE6</i> overexpression transgenic line.　<i>CLE6</i> is up-regulated by GAs and acts as long-distance signal for organ growth.　In conclusion, mentioned GA functions are considered essential for information exchange between shoot and root.</p>