CAROTENOID CLEAVAGE DIOXYGENASE 7 modulates plant growth, reproduction, senescence, and determinate nodulation in the model legume Lotus japonicus

The results show that the impairment of CCD7 activity in L. japonicus leads to a phenotype linked to SL functions, but with specific features possibly due to the peculiar developmental pattern of this plant species

Junwei Liu; Mara Novero; Tatsiana Charnikhova; Alessandra Ferrandino; Andrea Schubert; Carolien Ruyter-Spira; Paola Bonfante; Claudio Lovisolo; Harro J. Bouwmeester; Francesca Cardinale

2013

Scholarcy highlights

  • The role of SLs was studied for the first time in the model plant Lotus japonicus using transgenic lines silenced for CAROTENOID CLEAVAGE DIOXYGENASE 7, the orthologue of Arabidopsis More Axillary Growth 3
  • The results show that the impairment of CCD7 activity in L. japonicus leads to a phenotype linked to SL functions, but with specific features possibly due to the peculiar developmental pattern of this plant species
  • The role of SLs in the regulation of plant architecture is conserved in L. japonicus, but with some peculiarities
  • In transgenic Lotus, this increase was most probably due to several of the accessory buds in the aerial axils developing into lateral shoots, in contrast to what happens in the wild type
  • The shoot-to-root ratio potentially offers a larger surface to rhizobial infection for the same root biomass, RNA interference roots carried significantly fewer nodules per gram of fresh weight than the negative control 2 weeks post-inoculation
  • Primary and secondary shoots were shorter in CCD7-silenced plants compared with control plants because of a reduced internode length rather than number
  • Evidence was presented that LjCCD7 is crucial for SL synthesis in Lotus, where the role of SLs is conserved in the regulation of root and shoot architecture, with some peculiarities; among them, the effects on primary root growth, internode length, number of higher order branches, and root-to-shoot biomass ratio

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