Journal Article

Two <i>SCARECROW-LIKE</i> genes are induced in response to exogenous auxin in rooting-competent cuttings of distantly related forest species

Conchi Sánchez, Jesús M. Vielba, Enrique Ferro, Guillermo Covelo, Alicia Solé, Dolores Abarca, Belén S. de Mier and Carmen Díaz-Sala

in Tree Physiology

Volume 27, issue 10, pages 1459-1470
Published in print October 2007 | ISSN: 0829-318X
Published online October 2007 | e-ISSN: 1758-4469 | DOI: http://dx.doi.org/10.1093/treephys/27.10.1459
Two SCARECROW-LIKE genes are induced in response to exogenous auxin in rooting-competent cuttings of distantly related forest species

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We characterized SCARECROW-LIKE genes induced by auxin in rooting-competent cuttings of two distantly related forest species (Pinus radiata D. Don and Castanea sativa Mill.) before the activation of cell division that results in adventitious root formation. The predicted protein sequences contain domains characteristic of the GRAS protein family and show a strong similarity to the SCARECROW-LIKE proteins, indicating conserved functions of these proteins. Quantitative RT-PCR analysis showed that these genes are expressed at relatively high levels in roots. Induction of increased mRNA levels in rooting-competent cuttings of both species in response to exogenous auxin was observed within the first 24 h of the root induction process, a time when cell reorganization takes place, but before the resumption of cell division and the appearance of adventitious root primordia. These results suggest that SCARECROW-LIKE genes play a role during the earliest stages of adventitious root formation.

Keywords: chestnut; pine; root meristem; vegetative propagation

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Subjects: Plant Sciences and Forestry

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