The Influence Of Priming Two Cucumber Cultivar Seeds

J. Duhok Univ. Vol.13, No.1, (Agri. And Vet. Sciences) Pp 70-81, 2010
Gene action and Genetic Parameters:
Table (3) revealed that additive variance
varied from zero for all traits with the exception
of early yield palnt -1 (these traits are under the
effect of over dominant). This result agreed with
the findings of AL-hamdani (1999) who stated
that additive variance was significant for number
of branches plant -1 , date of flowering, number of
flowers inflorescence -1 , number of leaves till
first inflorescence and total yield plant -1 .
The dominant genetic variance and
environmental variance were not varied from
zero for all traits. The additive genetic variance
values were higher than those of dominant
genetic variance in all traits.
It is noticed that estimation of heritability in
broad sense was high in all traits excluding
number of branches and early yield which
exhibited moderate values. These results are
similar to the finding obtained by Singh et al.
(1974b), where heritability was high for plant
height and fruit diameter, and with those of Peter
and Singh (1974) for number of flowers
inflorescence -1 , fruit weight and also with those
of Boriker et al. (1981) for both plant height and
number of branches plant -1 . Heritability in
narrow sense h 2 (n.s) were moderate for early yield
33.68% and high for other traits . This illustrates
that heritability is high enough to perform the
selection of these traits in early generations.
Regarding traits revealing low heritability in
narrow sense , this reflects the low additive
genetic variance value . Similar results were
reported by AL-hamdani (1999) who mentioned
that heritability in narrow sense was high for
number of flowers inflorescence -1 and fruit
diameter .
Average degree of dominance was low for
some traits and high for other traits. Nandpur
and Tyagi (1976) also reported that fruit size
submits to partial dominant, Dharmegowda et al.
(1979b) stated that date of flowering is
submitted under partial dominance.
Phenotypic correlation:
Table (4) display the phenotypic correlation
between each two pair of studied traits by using
the data of parents and F1 hybrids of full diallel
cross. The total yield exhibited a positive and
significant correlation with number of branches
plant -1 , fruit length and number of fruits plant -1 ,
whereas, it was negatively and significant
correlated with date of flowering , fruit diameter
and fruit weight .These result are in conformity
with the finding of AL-Sahaf et al. (2003) who
found that the yield was significantly correlated
with no. of branches and number of fruit plant -1
.The early yield plant -1 had appositive and
significant correlation with date of flowering ,
fruit diameter and fruit weight , whereas,
negatively and significant correlated with fruit
length and number of fruits plant -1 . Fruit weight
trait revealed a positive and significant
correlation with date of flowering and fruit
diameter and negatively correlated with no. of
branches, fruit length and no. of fruits plant -1
These results are in agreement with Khanna and
Chaudhury (1974) AL-hayani et al. (2000) , AL-
Kumer et al. (1993) , Mirsha and Mirsha (1990)
who reported existence of significant correlation
between fruit weight and no. of fruits plant -1 . On
the other hand, number of fruits plant -1 was
significantly and positively correlated with no.
of branches and fruit length, while it had
negative and significant correlation with date of
flowering and fruit diameter. There was also a
significant and positive correlation between fruit
diameter and date of flowering and negatively
correlated with no. of branches and fruit length.
Fruit length had a positive and significant
correlation with number of branches, and had a
negative and significant correlation with date of
flowering. Date of flowering does not revealed
any correlation with no. of branches . The same
result was obtained between no. of branches and
plant height.
Path Coefficient Analysis:
Data reported in table (5) illustrate the direct
and indirect effects of correlation coefficient
between the total yield and some affecting traits.
Date of flowering appeared to have negative
direct effect on the yield, while the indirect
effect was low through plant height and high
through fruit weight, in spite of it had negative
correlation with the yield but it can indirectly
affect the yield through fruit weight. Similar
results were reported by Rao et al. (1974) who
found in chilli plant that date of flowering had
positive effects on fruit yield . Plant height
exhibited a positive direct effect on the yield
plant -1 , and a positive indirect effect through
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