44. Volume 15- Number 2 - IP Australia

PLANT VARIETIES JOURNAL 2002 VOL 15 NO. 2
to fused to leaf scar, bud tip in relation to growth ring level,
bud width excluding wings medium, bud wing width very
narrow, leaf scar medium prominence and oblique
descending towards bud, growth ring flush. Leaf: lamina
length of TVD leaf short with mean approximately 1.37m
(range 1.18 to 1.55m), width narrow with mean
approximately 38.4mm (range 31.3 to 44.6mm) at
longitudinal midpoint and bent near tip in attitude, midrib
width of lamina at longitudinal midpoint narrow with mean
3.7mm (range 2.8 to 4.4mm), ratio of lamina width/midrib
width low with mean approximately 10.5 (range 8.2 to
15.0). Leaf sheath: length of leaf sheath of TVD leaf very
short with mean approximately 24.9cm (range 22.5 to
28.0cm), adherence of sheaths of senescent leaves to culm
weak, density of hairs on abaxial leaf sheath surface (Group
57) medium and length medium to long. Ligule: shape
crescentiform, width at midrib section medium, density of
cilia along the free margin of ligule (Group 61) sparse and
length medium. Auricles: prominence inconspicuous,
asymmetrical, shape of inner or underlapping auricle
deltoid and size very small, shape of outer or overlapping
auricle transitional. Inflorescence: open panicle. Flowering:
discontinuous. Seed or fruit: caryopsis. Disease resistance:
highly resistant to Leaf Scald (Xanthomonas albilineans
(Ashby) Dowson), and intermediate to Pachymetra Root
Rot. Other characteristics: fibre quantity and quality are
acceptable for milling purposes (impact reading 0.43, shear
strength 27.8, short fibre 65.4%). In addition, ‘Q200’ 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
‘63N1700’ x pollen parent ‘66N2008’ in a planned breeding
program at Meringa (Gordonvale), QLD. ‘Q200’ is highly
resistant to Leaf Scald (score 2) and intermediate to
Pachymetra Root Rot (score 5) while ‘63N1700’ is very
highly resistant to Leaf Scald (score 1), susceptible to
highly susceptible Pachymetra Root Rot (score 7.5), and
‘66N2008’ is highly resistant to Leaf Scald (score 2) and
intermediate to susceptible to Pachymetra Root Rot (score
6). ‘Q200’ 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 ‘Q127’ and ‘Q167’ A were chosen,
as they are the most similar varieties of common knowledge
grown in the Northern region. Together, these varieties
accounted for about 1.2 % (85,300 t) of the Northern region
crop in 2001. Neither parent was included as a comparator
as both have been discarded from the parent collection.
However, the parents could be distinguished from the
candidate variety by their individual disease resistance
scores as mentioned above.
Comparative Trial Location: conducted at Meringa Sugar
Experiment Station (17º 12′ South, 145º 45′ East),
Gordonvale, QLD. The trial was planted 27 Jul 2000 and
harvested in Aug 2001. DUS data were recorded in mid
May 2001. Conditions: clones were propagated from
vegetative cuttings and grown under field conditions. Soil
type: Clifton. Watering regime: Rainfed. Chemicals:
fungicide Shirtan was applied at 400 ml per hectare at
planting. Stomp (4L/ha) and Atradex (2.25kg/ha) were
applied one week after planting to control weeds. Diurex
(4kg/ha) also was applied on 20 Nov 2000 for additional
weed control. Fertilisers: DAP (120kg/ha) was applied at
planting. Zinc sulphate heptahydrate (44kg/ha) was applied
on 18 Nov 2000 and CK 50/50 (353kg/ha) was applied on
31 Nov 2000. Total nutrients were: N – 106kg/ha; P –
24kg/ha; K – 85kg/ha; Zn – 10kg/ha; S – 5kg/ha. Trial
design: clones were grown in a randomised complete block
design with three replicates. Plots were single row by 10m,
with 1.5m between rows. Measurements: taken from up to
15 stalks sampled randomly per plot.
Prior Applications and Sales
No prior applications. First sold in Australia in May 2001.
Description: Dr George Piperidis, BSES, Indooroopilly, QLD.
Table 40 Saccharum varieties
‘Q200’ *‘Q127’ *‘Q167’ A
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TILLERING
medium many very many
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LEAF CANOPY
medium light to medium
medium
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SUCKERING
very few very few very few
to few
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ALIGNMENT OF INTERNODES
weakly medium weakly to
zigzagged zigzagged medium
zigzagged
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INTERNODE WIDTH – Central Perpendicular to Bud (mm)
LSD (P≤0.01) = 2.6
mean 22.5 a 27.5 b 25.5 b
std deviation 2.7 4.0 2.5
very thin medium thin
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INTERNODE WIDTH – Central Dissecting Bud (mm) LSD
(P≤0.01) = 2.7
mean 23.4 a 27.4 b 26.1 ab
std deviation 3.1 4.2 2.8
very thin thin to thin
medium
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INTERNODE SHAPE
conoidal
cylindrical to conoidal
concaveconvex
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