Agriculture Reference
In-Depth Information
Also grown in the same trial were five commer-
cial cultivars. The average performance of the
commercial cultivars was 211.10 and the standard
deviation was 41.93. Using univariate cross pre-
diction procedures determine which three crosses
should be used in breeding for cultivars which
would need to produce yields.
Golden Glory
112
Early Crimson
72
53
Sweet Delight
102
64
99
Dwarf Evens
56
41
65
49
Giant Red
130
100
109
107
115
Golden
Early
Sweet
Dwarf Giant
Glory
Crimson Delight Evens
Red
•
Greater than average controls plus
one
con-
trol standard deviation
Estimate the general combing ability of each par-
ent and calculate the specific combing ability of
each cross. Which parents would be 'best' in a
breeding programme to develop short cultivars?
(21) What is the difference between a cultivar with
general environmental adaptability
and one with
specific environmental adaptability
?
Eight yellow mustard F
8
breeding lines were
grown at 20 locations throughout the Pacific
Northwest region. Significant genotype
•
Greater than the average control plus
twice
the control standard deviation
Rank your choices as first,
second and third
and
include
the
probabilities
used
for
your
decision.
(19) 500 dry pea F
6
breeding lines were evaluated
for yield potential at two locations (Hillside and
Nethertown). After harvest and weighing, the
top 15% highest yielding lines were selected
at each location. When results from this selec-
tion were examined it was found that 39 lines
were selected in the top 15% at each site.
From this information, estimate the narrow-sense
heritability.
In this same study, the following phenotypic vari-
ances and site means yields (over all 500 F
6
lines)
were:
envi-
ronment interaction was detected for yield by
analysis of variance, and a joint regression anal-
ysis carried out. The following are line means and
environmental sensitivity (1+
×
β
) values from the
analysis.
Overall mean
Line
sensitivity
Environmental
Hillside
Nethertown
90.EW.34.5
1234
0.55
90.JB.456
1890
1.05
96 kg
2
124 kg
2
Phenotypic variance
90.JB.562
2345
1.34
Site mean
27 kg
29 kg
91.HG.12
1897
0.76
91.HH.145
1976
0.52
92.22.12
2567
1.42
Given these data and the heritability estimated
above, determine the expected response from
selection at 10% level.
(20) Describe the difference between general combin-
ing ability and specific combining ability.
The following are average plant heights (over four
replicates) of a 5
92.AE.1
2156
0.83
92.HK.134
2152
1.72
Select the two '
best
' breeding lines which show
general environmental adaptability. Select the two
'
best
' breeding lines which show specific environ-
mental adaptability.
5 half diallel (including selfs)
between sweet cherry cultivars.
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