44. Volume 15- Number 2 - IP Australia

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PLANT VARIETIES JOURNAL 2002 VOL 15 NO. 2 diameter of longest internode central and dissecting bud medium with mean approximately 28.9mm (range 22.3 to 34.0mm), shape bobbin to concave-convex, cross-section round, colour of dewaxed internode exposed to sun yellowgreen RHS 144A and 146C, unexposed colour yellowgreen RHS 153D and greyed-yellow RHS 160B, waxiness medium, wax band distinct and width medium, expression of zigzag alignment weak to medium, growth cracks very few, cork cracks very few. Bud groove: absent. Node: width of root band on bud side narrow (mean 6.9mm), bud prominence medium, bud shape round to horizontal oval with position of base fused to leaf scar, bud tip in relation to growth ring below to level, bud width excluding wings wide, 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 1.51m (range 1.32 to 1.68m), width medium to wide with mean approximately 46.7mm (range 34.3 to 53.5mm) at longitudinal midpoint and bent near tip in attitude, midrib width of lamina at longitudinal midpoint medium to wide with mean 4.7mm (range 3.4 to 5.4mm), ratio of lamina width/midrib width low with mean approximately 10.1 (range 7.5 to 14.5). Leaf sheath: length of leaf sheath of TVD leaf long with mean length approximately 32.9cm (range 25.0 to 36.0cm), adherence of sheaths of senescent leaves to culm medium to strong, density of hairs on abaxial leaf sheath surface (Group 57) very sparse and length very short. Ligule: shape crescentiform and wide at midrib section, density of cilia along the free margin of ligule (Group 61) very sparse and length very short. Auricles: prominence inconspicuous to medium, asymmetrical, shape of inner or underlapping auricle deltoid and size small to medium, 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), resistant to Pachymetra Root Rot. Other characteristics: fibre quantity and quality are acceptable for milling purposes (impact reading 0.54, shear strength 34, short fibre 52%). In addition, ‘Q201’ 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 ‘82N218’ x pollen parent ‘Q121’ in a planned breeding program at Meringa (Gordonvale), QLD. ‘Q201’ is highly resistant to Leaf Scald (score 2) and resistant to Pachymetra Root Rot (score 3) while ‘82N218’ is very highly susceptible to Leaf Scald (score 9) and intermediate to susceptible to Pachymetra Root Rot (score 6) and ‘Q121’ is very highly resistant to Leaf Scald (score 1) and highly susceptible to Pachymetra Root Rot (score 8). ‘Q201’ 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. In addition, ‘Q201’ was specifically selected for its low propensity to sucker and its erect growth habit. 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: Stations. QLD. Bureau of Sugar Experiment Choice of Comparators ‘Q186’ A and ‘Q187’ A were chosen, as they are the most similar varieties of common knowledge grown in the Northern region. Together, these varieties accounted for about 0.7% (75,000 t) of the Northern region crop in 2001. ‘Q121’ also was included as the pollen parent. The seed parent was not included as a comparator as it has been discarded from the parent collection. However, the seed parent could be distinguished from the candidate variety by the 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 400ml 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 application. First sold in Australian in May 2001. Description: Dr George Piperidis, BSES, Indooroopilly, QLD. Table 41 Saccharum varieties ‘Q201’ *‘Q121’ *‘Q186’ A ‘Q187’ A ____________________________________________________ GROWTH HABIT erect semi-erect erect erect ____________________________________________________ LEAF CANOPY light to light to light to medium medium medium medium ____________________________________________________ SUCKERING very few few very few very few ____________________________________________________ CULM HEIGHT (m) LSD (P≤0.01) = 0.46 mean 2.54 a 2.92 b 2.89 b 2.68 ab std deviation 0.32 0.28 0.29 0.18 short medium medium short to medium ____________________________________________________ ALIGNMENT OF INTERNODES weakly to weakly to medium medium medium medium zigzagged zigzagged zigzagged zigzagged 76
DESCRIPTIONS PLANT VARIETIES JOURNAL 2002 VOL 15 NO. 2 INTERNODE SHAPE bobbin- bobbin- slightly cylindrical to shaped to shaped to concave- concaveconcave- concave- convex convex convex convex ____________________________________________________ INTERNODE CROSS-SECTION round round oval round ____________________________________________________ INTERNODE DEWAXED COLOUR (RHS) – Exposed yellow- yellow- yellow- yellowgreen green green (146B) (144A and (146B) (146A to 146C) 146B) ____________________________________________________ INTERNODE DEWAXED COLOUR (RHS) – Unexposed yellow- yellow- yellow- greyedgreen green green yellow (153D) (152D) (144C (160B) and greyed- and 153D) yellow (160B) ____________________________________________________ INTERNODE WAX COVERING medium medium medium light ____________________________________________________ WAX BAND DISTINCTIVENESS distinct indistinct moderate indistinct to moderate ____________________________________________________ WAX BAND WIDTH medium n/a narrow medium ____________________________________________________ GROWTH CRACKS very few very few absent absent ____________________________________________________ CORK CRACKS very few very few very few very few to few ____________________________________________________ BUD GROOVE PRESENCE absent inconsp- inconsp- medium icuous icuous ____________________________________________________ BUD – PROMINENCE medium weak medium medium ____________________________________________________ BUD – SHAPE round to rhomboid oval to triangular horizontal to ovate pointed oval triangular pointed ____________________________________________________ BUD – POSITION OF BASE (Above Leaf Scar) fused fused fused fused to near ____________________________________________________ BUD – POSITION OF TIP (Relative to Growth Ring) below above below level to level ____________________________________________________ BUD WIDTH (Excluding Wings) wide wide narrow narrow ____________________________________________________ BUD WING WIDTH medium wide narrow medium ____________________________________________________ LEAF SCAR PROMINENCE medium medium medium to medium prominent ____________________________________________________ GROWTH RING flush to swollen flush to swollen swollen swollen ____________________________________________________ LAMINA LENGTH (TVD Leaf) (m) LSD (P≤0.01) = 0.11 mean 1.51 a 1.49 a 1.34 b 1.59 a std deviation 0.09 0.14 0.12 0.09 medium medium short medium to long ____________________________________________________ LAMINA WIDTH (Longitudinal Midpoint) (mm) LSD (P≤0.01) = 3.5 mean 46.7 a 41.3 b 47.3 a 51.9 c std deviation 3.9 2.6 2.7 2.1 medium narrow to medium wide to to wide medium to wide very wide ____________________________________________________ MIDRIB WIDTH (Longitudinal Midpoint) (mm) LSD (P≤0.01) = 0.4 mean 4.7 a 3.9 b 4.9 ac 5.2 c std deviation 0.5 0.6 0.4 0.4 medium narrow to wide wide to to wide medium very wide ____________________________________________________ LAMINA WIDTH/MIDRIB WIDTH RATIO low medium low low ____________________________________________________ LAMINA ATTITUDE bent near curve erect erect to curve tip near near tip near tip middle and curve near middle ____________________________________________________ LEAF SHEATH – ADHERENCE TO CULM medium medium medium weak to to strong to strong medium ____________________________________________________ LENGTH OF TVD LEAF SHEATH (cm) LSD (P≤0.01) = 2.0 mean 32.9 ab 34.3 b 26.2 c 30.8 a std deviation 2.1 2.0 1.4 1.8 long long to very short medium very long to short ____________________________________________________ HAIR GROUP 57 – OCCURRENCE very sparse sparse to very sparse medium medium to dense ____________________________________________________ HAIR GROUP 57 – LENGTH very short medium short to medium to long medium to long ____________________________________________________ LIGULE HEIGHT wide wide medium medium ____________________________________________________ HAIR GROUP 61 – DENSITY/OCCURRENCE very medium very dense sparse sparse to sparse ____________________________________________________ 77
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Plant Varieties Journal Quarter Two
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ACCEPTANCES PLANT VARIETIES JOURNAL
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44. Volume 15- Number 2 - IP Australia

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