44. Volume 15- Number 2 - IP Australia

DESCRIPTIONS
PLANT VARIETIES JOURNAL 2002 VOL 15 NO. 2
LEAF SHEATH – ADHERENCE TO CULM
medium medium weak to
to strong medium
____________________________________________________
LENGTH OF TVD LEAF SHEATH (cm) LSD (P≤0.01) = 2.0
mean 32.0 a 29.3 b 30.8 ab
std deviation 1.7 3.1 1.8
medium short to medium
to long medium
____________________________________________________
HAIR GROUP 57 – OCCURRENCE
medium sparse medium to dense
____________________________________________________
HAIR GROUP 57 – LENGTH
medium medium medium to long
____________________________________________________
LIGULE HEIGHT
wide wide medium
____________________________________________________
HAIR GROUP 61 – DENSITY/ OCCURRENCE
sparse sparse to dense
medium
____________________________________________________
AURICLE -PROMINENCE (Second Fully Unfurled Leaf)
medium prominent inconspicuous
____________________________________________________
AURICLE SHAPE – ULP
lanceolate lanceolate dentoid
____________________________________________________
AURICLE SHAPE – OLP
deltoid lanceolate transitional
____________________________________________________
AURICLE SIZE – ULP
medium medium small
to large to large
____________________________________________________
AURICLE SIZE – OLP
large small n/a
____________________________________________________
Means followed by the same letter are not significantly different at P≤0.01,
Duncan’s Multiple Range Test.
‘Q199’
Application No: 2002/028 Accepted: 4 Mar 2002.
Applicant: Bureau of Sugar Experiment Stations,
Indooroopilly, QLD.
Characteristics (Table 39, Figure 46) Ploidy: cytologically
complex polyploid and aneuploid interspecific hybrid.
Plant: stool growth habit erect, tillering medium, number of
suckers very few to few, leaf canopy light. Stem: culm
height (base to TVD leaf) short to medium with mean
length approximately 2.77m (range 2.12 to 3.23m).
Internode: length on bud side short to medium with mean
length approximately 16.2cm (range 14.2 to 18.4cm),
length on opposite to bud side short with mean length
approximately 15.6cm (range 14.0 to 17.8cm), diameter of
longest internode central and perpendicular to bud thick
with mean approximately 31.2mm (range 17.9 to 38.4mm),
diameter of longest internode central and dissecting bud
thick to very thick with mean approximately 32.6mm
(range 18.3 to 39.9mm), shape bobbin to concave-convex,
cross-section round to oval, colour of dewaxed internode
exposed to sun yellow-green RHS 148A and greyed-purple
RHS 187A, unexposed colour yellow-green RHS 151D and
152B, waxiness medium to heavy, wax band distinctiveness
moderate and width medium, expression of zigzag
alignment weak, growth cracks very few to few, cork cracks
very few. Bud groove: inconspicuous, length very short to
short, depth very shallow. Node: width of root band on bud
side medium (mean 9.4mm), bud prominence weak, bud
shape ovate to triangular pointed with position of base
medium to leaf scar, bud tip in relation to growth ring level,
bud width excluding wings narrow, bud wing width
medium, leaf scar medium prominence and oblique
descending towards bud, growth ring flush to swollen. Leaf:
lamina length of TVD leaf medium with mean
approximately 1.53m (range 1.30 to 1.68m), width wide
with mean approximately 49.3mm (range 30.6 to 59.0mm)
at longitudinal midpoint and curved near tip in attitude,
midrib width of lamina at longitudinal midpoint medium to
wide with mean 4.5mm (range 3.5 to 5.5mm), ratio of
lamina width/midrib width medium with mean
approximately 11.1 (range 8.7 to 13.4). Leaf sheath: length
of leaf sheath of TVD leaf short to medium with mean
approximately 28.4cm (range 26.0 to 31.0cm), adherence of
sheaths of senescent leaves to culm weak, density of hairs
on abaxial leaf sheath surface (Group 57) sparse to medium
and length medium. Ligule: shape crescentiform, width at
midrib section medium, density of cilia along the free
margin of ligule (Group 61) very sparse to sparse and length
very short to short. Auricles: prominence inconspicuous,
asymmetrical, shape of inner or underlapping auricle
transitional, shape of outer or overlapping auricle
transitional. Inflorescence: open panicle. Flowering:
discontinuous. Seed or fruit: caryopsis. Disease resistance:
intermediate to susceptible to Leaf Scald (Xanthomonas
albilineans (Ashby) Dowson), and highly resistant to
Pachymetra Root Rot. Other characteristics: fibre quantity
and quality are acceptable for milling purposes (impact
reading 0.48, shear strength 26.8, short fibre 67.6%). In
addition, ‘Q199’ was uniquely identified by DNA
fingerprinting using microsatellite markers, and did not
match any other current sugarcane DNA profile.
Origin and Breeding Controlled pollination: seed parent
‘H49-104’ x pollen parent ‘Q99’ in a planned breeding
program at Meringa (Gordonvale), QLD. ‘Q199’ is
intermediate to susceptible to Leaf Scald (score 6) and
highly resistant to Pachymetra Root Rot (score 2), while
‘H49-104’ is highly susceptible to Leaf Scald (score 8),
resistant to Pachymetra Root Rot (score 3), and ‘Q99’ is
highly resistant to resistant to Leaf Scald (score 2.5),
susceptible to Pachymetra Root Rot (score 7). ‘Q199’ has
been evaluated and selected by BSES in yield trials on the
Meringa Sugar Experiment Station at Gordonvale and sites
within the sugarcane growing area of the Northern region.
Standard commercial varieties were also included in the
trials for comparative purposes. Selection criteria: cane
yield, ccs, and sugar yield have been the main selection
criteria. Disease resistance screening was conducted at the
pathology farm (Eight Mile Plains) and in the Tully
glasshouse. Propagation: after an initial seedling stage
(using seed from the cross), all subsequent stages have
involved vegetative propagation. Breeder: Bureau of Sugar
Experiment Stations. QLD.
Choice of Comparators ‘Q96’, ‘Q127’ and ‘Q167’ A were
chosen, as they are the most similar varieties of common
71