Plant Variety Journal - IP Australia

Details of Application
Application Number 2006/123
Variety Name ‘DP 611 BGII/RR’
Genus Species Gossypium hirsutum
Common Name Cotton
Synonym Nil
Accepted Date 29 Jun 2006
Applicant Deltapine Australia Pty Ltd, Narrabri, NSW
Agent N/A
Qualified Person Richard Leske
Details of Comparative Trial
Location Locharba, Narrabri, NSW.
Descriptor Cotton (Gossypium) TG/88/6.
Period Field trial grown during the summer of 2006/07.
Conditions Field trial conditions: plants grown from seed, each variety
grown on 1m row spacing x 12m plot length, commercial
rates of fertiliser, herbicides and insecticides applied as
required, trial fully irrigated. GMO Bio-assay conditions: leaf
disc samples removed from small plants and ground in
centrifuge tubes with extraction buffer, test strips impregnated
with antibodies added to detect the presence or absence of the
Cry 1A(c) and Cry IIAb Bt proteins and the RR herbicide
protein.
Trial Design Randomised complete block with 10 replicates per variety.
Measurements Field trial: morphological plant characteristics measured from
10 non-tipped plants per replicate, one measurement per
plant. Fibre quality samples picked from a 1.5m section of
each row in each replicate and analysed by HVI instrument
testing. GMO bio-assay: leaf disc samples removed from 5
plants per replicate and tested for the presence or absence of
the Cry 1A(c) and Cry IIAb Bt proteins and the RR herbicide
protein.
RHS Chart - edition N/A
Origin and Breeding
Controlled pollination: F1 seed parent (‘DeltaPEARL’ x ‘DP 50 BX’) crossed with F1
pollen parent (‘DeltaPEARL’ x ‘DP 555 BG/RR’) followed by 2 backcross cycles to
the recurrent parent ‘DeltaPEARL’. The seed parent is used to introduce the
transgenic Cry IIAb insect tolerance gene and the pollen parent is used to introduce
the transgenic Cry 1A(c) insect tolerance gene and the Roundup Ready herbicide
tolerance gene. Hybridisation took place in Deltapine Australia’s greenhouse located
at Locharba, Narrabri, NSW. Single plants were selected under field conditions at
Locharba in F3 generation. Progeny rows were selected in the F4 generation and the
final selection was tested in replicated yield and fibre quality trials from 2002/05.
Selection criteria included expression of the Cry1A(c) and Cry IIA Bt traits,
expression of the Roundup Ready herbicide trait, disease tolerance to bacterial blight
and yield and fibre quality. Propagation: by seed. Breeders: Richard Leske and Gerard
Lonergan, Deltapine Australia Pty. Ltd, Locharba, Narrabri, NSW.
Page 187 of 550
Plant Varieties Journal Vol. 21 No.3