44. Volume 15- Number 2 - IP Australia

DESCRIPTIONS
PLANT VARIETIES JOURNAL 2002 VOL 15 NO. 2
LAMINA ATTITUDE
curve curve curve
near tip near tip near middle
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LEAF SHEATH – ADHERENCE TO CULM
medium absent medium
to weak
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LENGTH OF TVD LEAF SHEATH (cm) LSD (P≤0.01) = 2.9
mean 33.6 a 40.7 b 37.0 c
std deviation 2.1 2.3 2.9
short to medium medium
medium to long
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HAIR GROUP 57 – OCCURRENCE
sparse to sparse to medium
medium medium to dense
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HAIR GROUP 57 – LENGTH
short to short medium
medium
to long
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LIGULE HEIGHT
medium wide medium
to wide
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HAIR GROUP 61 – DENSITY/ OCCURRENCE
dense medium medium
to dense
to dense
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AURICLE -PROMINENCE (Second Fully Unfurled Leaf)
medium inconspicuous prominent
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AURICLE SIZE – ULP
small to very small medium
medium to small to large
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Means followed by the same letter are not significantly different at P≤0.01,
Duncan’s Multiple Range Test.
‘Q198’
Application No: 2002/027 Accepted: 4 Mar 2002.
Applicant: Bureau of Sugar Experiment Stations,
Indooroopilly, QLD.
Characteristics (Table 38, Figure 45) Ploidy: cytologically
complex polyploid and aneuploid interspecific hybrid.
Plant: stool growth habit erect, tillers per stool many,
number of suckers few, leaf canopy light to medium. Stem:
culm height (base to TVD leaf) medium with mean length
approximately 2.91m (range 2.27 to 3.31m). Internode:
length on bud side medium with mean length approximately
17.5cm (range 14.5 to 20.5cm), length on opposite to bud
side medium with mean length approximately 17.3cm
(range 14.0 to 20.6cm), diameter of longest internode
central and perpendicular to bud thin to medium with mean
approximately 26.6mm (range 20.7 to 33.2mm), diameter
of longest internode central and dissecting bud medium
with mean approximately 27.5mm (range 21.1 to 33.7mm),
shape bobbin, cross-section round, colour of dewaxed
internode exposed to sun yellow-green RHS 146A to 146B,
unexposed colour yellow-green RHS 146D and 151D and
greyed-yellow RHS 160A, waxiness light, wax band
distinctiveness moderate and width narrow, expression of
zigzag alignment medium, growth cracks absent, cork
cracks very few. Bud groove: absent. Node: width of root
band on bud side narrow (mean 8.3mm), bud prominence
medium, bud shape oval with position of base near to leaf
scar, bud tip in relation to growth ring level, bud width
excluding wings medium, bud wing width narrow, leaf scar
medium prominence and oblique descending towards bud,
growth ring flush. Leaf: lamina length of TVD leaf medium
with mean approximately 1.47m (range 1.21 to 1.65m),
width wide with mean approximately 50.9mm (range 39.1
to 58.9mm) at longitudinal midpoint and curved near tip in
attitude, midrib width of lamina at longitudinal midpoint
wide with mean 4.9mm (range 3.5 to 6.2mm), ratio of
lamina width/midrib width low with mean approximately
10.5 (range 8.6 to 14.1). Leaf sheath: length of leaf sheath
of TVD leaf medium to long with mean approximately
32.0cm (range 29.0 to 35.5cm), adherence of sheaths of
senescent leaves to culm medium, density of hairs on
abaxial leaf sheath surface (Group 57) medium and length
medium. Ligule: shape crescentiform, width at midrib
section wide, density of cilia along the free margin of ligule
(Group 61) sparse and length very short. Auricles:
prominence medium, asymmetrical, shape of inner or
underlapping auricle lanceolate and size medium to large,
shape of outer or overlapping auricle deltoid and size large.
Inflorescence: open panicle. Flowering: discontinuous.
Seed or fruit: caryopsis. Disease resistance: very highly
resistant to Fiji Disease Virus, highly resistant to Leaf Scald
(Xanthomonas albilineans (Ashby) Dowson), resistant to
intermediate to Red Rot (Glomerella tucumanensis (Spego)
Arx and Mueller), and intermediate to Pachymetra Root
Rot. Other characteristics: fibre quantity and quality are
acceptable for milling purposes (impact reading 0.72, shear
strength 33.3, short fibre 62.9%). In addition, ‘Q198’ 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
‘Q90’ x pollen parent ‘66N2008’ in a planned breeding
program at Meringa (Gordonvale), QLD. ‘Q198’ is very
highly resistant to Fiji Disease Virus (score 1), highly
resistant to Leaf Scald (score 2), and intermediate to
Pachymetra Root Rot (score 5), while ‘Q90’ is intermediate
to susceptible to Fiji Disease Virus (score 6), highly
susceptible to Pachymetra Root Rot (score 8), and
‘66N2008’ is intermediate to susceptible to Pachymetra
Root Rot (score 6). ‘Q198’ 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 ‘Q138’ and ‘Q187’ were chosen
as they are the most similar varieties grown in the Northern
region. Together, these varieties accounted for about 6.3 %
(611,000 t) of the Northern region crop in 2001. Neither
parent was included as a comparator as both have been
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