Short Communication

Molecular mechanism of crown root initiation and the different mechanisms between crown root and radicle in rice

Volume 6, Issue 9   September 2011
Pages 1276 - 1278
http://dx.doi.org/10.4161/psb.6.9.16787
Authors: Yuka Kitomi , Kitano Hidemi and Yoshiaki Inukai

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Abstract:
Monocot plants produce numerous adventitious (crown) roots. The plant hormone auxin has positive effects on crown root formation, while cytokinin suppresses it. We have demonstrated that auxin-induced CROWN ROOTLESS5 (CRL5) regulates crown root initiation in rice through the induction of OsRR1, a negative regulator of cytokinin signaling. CRL5 over-expressing calli formed adventitious roots, although CRL5 over-expressing plants did not induce ectopic roots, suggesting that CRL5, which promotes de novo root initiation, might function only in de-differentiated cells. A radicle initiated normally in a crl5 mutant, in spite of the defect in crown root initiation, whereas crown roots, but not a radicle, were produced in a radicleless1 (ral1) mutant. A crl5 ral1 double mutant displayed an additive phenotype, showing that the formation of each root is regulated by different genetic mechanisms in rice.

Received: May 31, 2011; Accepted: June 6, 2011

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