The Influence Of Priming Two Cucumber Cultivar Seeds

J. Duhok Univ. Vol.13, No.1, (Agri. And Vet. Sciences) Pp 103-111, 2010
GENETIC VARIABILITY CORRELATION AND PATH ANALYSIS
IN SOME MAIZE INBRED LINES
MOHAMMED ALI HUSSAIN
Dept. soil and water, College of agriculture, University of Duhok, Kurdistan Region-Iraq
(Received: June 8, 2010; Accepted for publication: February 27, 2011)
ABSTRACT
The study was carried out at the field of College of Agriculture/ University of Duhok during spring and autumn
season on 2008 . Thirteen locally raised inbred lines were used in the study to calculate phenotypic coefficient of
variability , genotypic variability, broad sense heritability, correlation and path analysis , the result showed that leaf
area had significant genotypic and phenotypic association with ear length, number of kernels per ear and plant yield
and also was found that genotypic and phenotypic coefficient had highly significant for plant yield, ear height and leaf
area, while the traits (days to 50% silking, plant height, leaf area, and number of kernels per ear) had comparatively
higher broad sense heritability in both season. The number of kernels/ ear and leaf area direct influence on yield and
indirectly affected the ear length , this traits could be utilize for kernel yield improvement. The results of this study
can be used of promising inbred lines in a program to produce the hybrid from locally inbred line.
KEYWORDS: Maize genetic, variability, correlation and path analysis
O
INTRODUCTION
ne of the well known source to get
inbred lines is by making self
pollination to various kinds of genotypes,
synthetic compound and hybrid verities. The
kinds of genotypes of the hybrid and varieties
which are used in agriculture are considered one
of the main factors on forming of the yield of the
area units, besides other various agricultural
operations, where genotypes differ from each
other in their genetic abilities for production and
the extent to which they reach with their respond
to the modern agricultural methods (10) .
It is notable that the most of growing
countries still depend on local varieties and
synthetic varieties , also they use these varieties ,
which have the trait of low yield of the area unit,
in 62% of the area , which is assigned to produce
maize was low rate of productivity (6 and 16) .
Developing countries made use of the heterosis
capability to develop programs of hybrid maize
(15 and 17)
. By which they could achieve high rate
of yield to the area unit which fulfill the needs of
local markets by this product and even they
could monopoly the global markets for
producing hybrid kernel in some countries.
These countries achieved an increase of
productivity of (25-30%) the yield unit of area
(4)
. Since deduction and production of hybrid are
in need to inbred lines production, which was
still monopolized by specific foreign companies.
The importance of inbred line production to
produce single or three way cross and double
cross is obvious, which play an effective role to
increase the yield of the area unit. Early studies
were done on the estimation of genotypes
through genetic variability, heritability and
correlation between the yield and its components
(19) . Earlier researchers concluded that kernel
yield per plant was positively and significantly
correlated with plant height and number of ear/
plant (1) . The 100 kernel weight was highly
significant with kernel yield in double and
double top crosses, plant height, days to 75%
silking and 100 kernel weight positively
influenced the yield directly and also indirectly
through several yield components (5) .
Kernel yield per plant was positively and
significantly correlated with 100 kernel weight
and ear height. Path analysis showed that 100
kernel weight and number of ear/ plant were
important components determining kernel yield (7)
Days to 50% tasseling, days to 50% silking, ear,
height plant height and 100 kernel weight had
positive and significant correlation with kernel
yield (11) also the 100 kernel weight , number of
ear per plant , plant height and number of days to
flowering were useful in improving kernel yield
in maize hybrids (12) , path analysis showed that
ear height , plant height and 100 kernel weight
had main effective contribution to the kernel
yield (13). Estimated the genotypic correlation
coefficients were generally higher than their
corresponding phenotypic correlation
coefficients. Days to 50% of tasseling had
positive significant correlation with ear height
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