The Decreased apical dominance1/Petunia hybrida CAROTENOID CLEAVAGE DIOXYGENASE8 Gene Affects Branch Production and Plays a Role in Leaf Senescence, Root Growth, and Flower Development

The authors responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors are: Kimberley C

Kimberley C. Snowden; Andrew J. Simkin; Bart J. Janssen; Kerry R. Templeton; Holly M. Loucas; Joanne L. Simons; Sakuntala Karunairetnam; Andrew P. Gleave; David G. Clark; Harry J. Klee

2005

Scholarcy highlights

  • The architecture of plants is diverse and ranges from a simple unbranched shoot system to the complex multiply branched shoot systems, classified into 23 distinct architectural patterns, seen in most trees
  • Mutations in the carotenoid cleavage dioxygenase Gene Family Member PhCCD8 Are Responsible for the Highly Branched Phenotype of dad1 Mutants in Petunia
  • We have shown that mutations in the Decreased apical dominance1/ PhCCD8 gene are responsible for the highly branched dad1 phenotype
  • (A) Number of nodes before the terminal flower in Dad1/PhCCD8 RNA interference lines and dad1-1 compared with wild-type controls. Flower weight of Dad1/PhCCD8 RNAi lines and dad1-1 compared with wild-type controls. Flowers from Dad1/PhCCD8 RNAi lines and dad1-1 compared with the wild type
  • (A) Roots of wild-type and Dad1/PhCCD8 RNAi plants weeks postgermination. Roots of wild-type and dad1-1 plants weeks postgermination. The development of roots on cuttings from Mitchell Diploid and Dad1/PhCCD8 RNAi lines after 6 weeks. Adventitious roots developing on the lower stems of a Dad1/PhCCD8 RNAi line but not on wild-type stems
  • The conservation of the CCD8 gene and the mutant phenotypes between petunia, pea, and Arabidopsis indicates that branch development is controlled by a similar mobile signaling molecule, which in turn suggests that the mechanism of control of branch development may be widely conserved
  • Because only a small piece of wild-type stem interstock tissue is required for reversion, the Decreased apical dominance1/PhCCD8 gene product must be active to a high enough level to produce the wild-type phenotype

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