Inoculation with all the strains caused increase in number of
ray florets of flowers in treated plants as compared to the non-inoculated control treatment except the isolate Bacillus sp.
The achenes of the
ray florets, which possess markedly incurved corky margins (Fig.
In the second mutation, which results in the tubular florets, the insertion of a "jumping gene" disrupts the ability of the plant to produce normal
ray florets. As a result, tubular florets are produced in place of the normal
ray florets.
The showier outer
ray florets contain only female parts.
Collerette dahlias have a single row of outer
ray florets which form a disc.
The shape of the petals (called
ray florets) determines the flower formation.
They are members of the Compositae or Sunflower family with a central head composed of many tubular florets surrounded by
ray florets with showy, strap-like petals.