47. Volume 14- Number 2 - IP Australia

LINT %
mean 40.7 39.6
std deviation 1.2 1.2
LSD/sig 0.53 P≤0.01
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FIBRE QUALITY CHARACTERISTICS
LENGTH (mm)
mean 29.8 30.5
std deviation 0.7 1.0
LSD/sig 0.23 P≤0.01
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EXTENSION (%)
mean 5.6 6.1
std deviation 1.6 1.8
LSD/sig 0.21 P≤0.01
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MICRONAIRE
mean 4.4 4.1
std deviation 0.4 0.4
LSD/sig 0.11 P≤0.01
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‘Siokra S-102’
Application No: 2000/284 Accepted: 12 Sep 2000.
Applicant: CSIRO Plant Industry, Cotton Research Unit,
Narrabri, NSW.
Characteristics (Table 13, Figure 38) Plant: shape conical,
height short, maturity early (163 days to mature), foliage
density sparse. Leaf: shape digitate, pubescence of midrib
very slight, gossypol and nectary glands present. Flower:
colour of petals cream, stigma distance above stamens short
(mean 0.3mm). Boll: size medium, shape ovate, pitting of
surface fine, length of peduncle short (mean 21mm),
prominence of tip medium, opening medium, bract size
medium (49mm x 30 mm). Seeds: density of fuzz medium.
Lint: proportion high (0.40), length medium (30.0 mm),
strength high (31.4 g/tex), micronaire value medium (4.1).
Disease: resistant to bacterial blight (Xanthomonas
campestris pv malvacearum), good tolerance to verticillium
wilt (Verticillium dahliae).
Origin and Breeding Controlled pollination: seed parent
‘Sicala V-1’ x pollen parent ‘Siokra S324’ in a planned
breeding program at the Australian Cotton Research
Institute (ACRI), Narrabri NSW. The seed parent ‘Sicala V-
1’ is distinguished from ‘Siokra S-102’ by its normal leaf
shape. The pollen parent ‘Siokra S324’ is distinguished
from ‘Siokra S-102’ by its susceptibility to verticillium wilt.
Two cycles of single plant selection followed by progeny
row and multiple environment trials were carried out.
Selection criteria: plant habit, resistance to bacterial blight,
resistance to verticillium wilt, leaf hair, lint % yield, early
maturity and fibre quality. Propagation: by seed. Breeder:
Mr PE Reid, CSIRO, Narrabri, NSW.
Choice of Comparators ‘Siokra S-101’ A was chosen
because it is a similar early maturing variety with okra leaf
shape. ‘Siokra S-102’ is a reselection from ‘Siokra S-101’ A ,
both varieties have the same parentage. The original parents
were not considered for the reasons stated above.
Comparative Trials Morphology trial location: Australian
Cotton Research Institute, Narrabri, NSW, 2000-01
summer. Conditions: field grown irrigated trial with
PLANT VARIETIES JOURNAL 2001 VOL 14 NO. 2
conventional management. Trial design: 30-entry trial in a
row and column design with four replicates and two rows x
14m plots. Measurements: morphological measurements on
10 plants from each plot. Fibre quality trial locations: 13
trial locations from Warren, NSW to Emerald, QLD,
1998/99 summer. Conditions: field grown irrigated trials
with conventional management. Trial design: 60-entry trial
in a row and column design with four replicates and three or
four row x 14m plots. Measurements: lint % and fibre
quality measurements taken on a 400g subsample from the
whole centre row harvest. Fibre quality was measured on a
Zellweger Uster HVI 900 instrument.
Prior Application and Sales Nil.
Description: Peter Reid, CSIRO Plant Industry, Cotton Research Unit,
Narrabri, NSW.
Table 13 Gossypium varieties
‘Siokra * ‘Siokra
S-102’ S-101’ A
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FIBRE QUALITY CHARACTERISTICS
UNIFORMITY INDEX (%)
mean 84.3 83.8
std deviation 1.1 1.0
LSD/sig 0.43 P≤0.01
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STRENGTH (g/tex)
mean 31.4 30.0
std deviation 1.6 1.5
LSD/sig 0.69 P≤0.01
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EXTENSION (%)
mean 6.6 7.3
std deviation 0.5 0.5
LSD/sig 0.25 P≤0.01
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‘Siokra V-16i’
Application No: 2000/281 Accepted: 12 Sep 2000.
Applicant: CSIRO Plant Industry, Cotton Research Unit,
Narrabri, NSW.
Characteristics (Table 14, Figure 39) Plant: shape conical,
height medium, maturity medium-late (176 days to mature),
foliage density medium. Leaf: shape digitate, pubescence of
midrib very slight, gossypol and nectary glands present.
Flower: colour of petals cream, stigma distance above
stamens medium (mean 2.6mm). Boll: size large, shape
ovate, pitting of surface fine, length of peduncle long (mean
33mm), prominence of tip medium, opening medium, bract
size large (52mm x 29mm). Seeds: density of fuzz medium.
Lint: proportion high (0.40), length medium (29.6mm),
strength high (31.2 g/tex), micronaire fine (3.7). Disease:
resistant to bacterial blight (Xanthomonas campestris pv
malvacearum), good tolerance to verticillium wilt
(Verticillium dahliae). Transgenes: Ingard® gene
incorporated for lepidopteran insect control.
Origin and Breeding Controlled pollination: seed parent
breeding line 95420 x pollen parent ‘Siokra V-16’ A in a
planned breeding program at the Australian Cotton
Research Institute (ACRI), Narrabri, NSW. The seed parent
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DESCRIPTIONS