الفهرس 
Performance, phenotypic and genotypic coefficient of variation, heritability and expected genetic gainOnly 14 pages are availabe for public view
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Abstract
In the present investigation 28 lines of triticale and 19 lines
of wheat were used to study some genetical and statistical parameters concerning plant grain
yield, some of its components and some technological characteristics of the grain. Two experiments
were conducted in the experimental farm of Faculty of Agriculture, Ain Shams University at
Shalakan, Kalubia Governorate, during the two successive seasons 1995/1996 and 1996/1997.
The results indicated that there were significant variations among different genotypes of both
triticale and wheat for all studied characters under the study.
Heritability values using the variance components method in triticale lines were more than 60% for
days to heading, spike length, number of spikelets /spike, wet gluten content, dry gluten
content, crude protein content, of the grain and fermentation time test In wheat lines heritability
values were more than 60% for days to heading, number of spikelets I spike, number of
kernels/spike, 100 milliliter weight, wet gluten content, dry gluten content, crude protein content
and fermentation time test and less than 60% for other characters.
Values of the expected genetic gain upon selecting the best 5% of the population were estimated at
11.98% and 6.35% for days
. to heading, 7.95% and 9.10% for plant height, 16.98% and 11.56%
for number of spikes /plant, 16.40% and 4.29% for spike length, 23.66% and 7.83% for number of
spikelets, 7.26% and 13.09% for number of kernels, in the spike, 8.76% and 7.57% for 100-kernel
weight, 14.24% and 15.89% for grain yield/plant, 3.87% and 6.28% for 100-milliliter weight, 27.74%
and 29.25% for wet gluten percentage, 23.56% and 32.12% for dry gluten percentage, 16.75% and
20.65% for crude protein percentage, 170.02% and 73.28% for fermentation time, 12.57% and 12.03%
for ash percentage in triticale lines and wheat lines, respectively.
Conelation coefficient values in triticale lines indicated that grain yield/plant was positively
and significantly associated at the phenotypic level with each of days to heading, plant height,
number of spikes/plant, spike length, number of spikelets/spike, number of kernels /spike, and
100-kemel weight. On the other hand grain yield /plant had negative and significant conelations
with both crude protein percentage and ash percentage. Grain yield/plant in wheat lines over the
tvvo seasons was conelated positively and significantly with each of plant height, number of spikes
/plant number of spikelets /spike and wet gluten percentage.
The path coefficient analysis revealed that the major grain yield variation contributcrs were found
to be 100-kernel weight followed by number Df spikes/plant, number of kernels/spike and plant
height at the phenotypic level over the two seasons in triticale lines. Whereas in wheat lines the
path coefficient analysis revealed that the major grain yield variation contributors were found to
be number of spikes/plant. number of spikelets/spike, number of kernels/spike, 100-kemel weight and
plant height at the phenotypic level over the two seasons.