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Report No.

${it TOO MUCH LOVE}$, a root regulator associated with the long-distance control of nodulation in ${it Lotus japonicus}$

Magori, Shimpei*; Kira, Erika*; Shibata, Satoshi*; Umehara, Yosuke*; Kochi, Hiroshi*; Hase, Yoshihiro; Tanaka, Atsushi; Sato, Shusei*; Tabata, Satoshi*; Kawaguchi, Masayoshi*

Legume plants tightly control the development and number of symbiotic root nodules. In ${it Lotus japonicus}$, this regulation required ${it HAR1}$ in the shoots, suggesting that a long-distance communication between the shoots and the roots may exist. To better understand its molecular basis, we isolated and characterized a novel hypernodulating mutant of ${it L. japonicus}$ named ${it too much love}$ (${it tml}$). Reciprocal grafting with wild type showed that ${it tml}$ hypernodulation is determined by the root genotype. Moreover, grafting a ${it har1}$ shoot onto a ${it tml}$ rootstock did not exhibit any obvious additive effects on the nodule number. These observations indicate that a shoot factor ${it HAR1}$ and a root factor ${it TML}$ participate in the same genetic pathway which governs the long-distance signaling of nodule number control. ${it TML}$ may function downstream of ${it HAR1}$ and the gene product ${it TML}$ might serve as a receptor or mediator of unknown mobile signal molecules that are transported from the shoots to the roots.



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Category:Biochemistry & Molecular Biology



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