Research Abstract
Two cycles of pedigree selection
for earliness index and
lint yield/plant were achieved in
two populations of Egyptian cotton
(G. barbadense L.) under late
planting condition. The genetic
materials were the F6, F7 and F8-
generations of (Giza 80 x Pima
56)/Giza 91 (pop. I) and Dandara/
Giza 80 (pop. II). The genotypic
coefficients of variation
(gcv) in the F6-genreation were
13.35 and 14.69% for earliness
index, and 23.70 and 27.60% for
lint yield/plant for pop. I and
pop. II; respectively. The remained
gcv after two cycles of
pedigree selection were 8.12 and
10.60% for earliness index, and
22.59 and 21.50% for lint
yield/plant for pop. I and pop. II;
respectively. The respective realized
heritability was 0.4550 and
0.2731 for earliness index, and
0.4128 and 0.3970 for lint
yield/plant. The average direct
observed gain was significant
and accounted for 5.59 and
3.80% for earliness index, and
6.68 and 5.45% (ns) for lint
yield/plant from the bulk sample
for pop. I and II; respectively.
Two promising superior families
were isolated from each population
in both of earliness index
and yield. For example, concerning
earliness index, the best superior
family No. 175 showed significant
(P0.01) observed gains
from the better parent of 26.81,
49.99, 18.17, 9.87, 43.19 and
13.78% for seed cotton
yield/plant, lint yield/plant, lint
percentage, seed index, lint index
and earliness index; respectively.
Research Department
Research Journal
Assiut J. Agric. Sci
Research Member
Research Pages
(1-15)
Research Rank
2
Research Vol
43:(6)
Research Year
2012
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