Genetic analysis for seven pea varieties and their half diallel hybrids for forage and seed yield

Sh. Ismael Tawfiq , S. Muhammad Sheikh Abdulla
Field Crops Department, Faculty of Agricultural Sciences, University of Sulaimani,

The present experiment was conducted at the experimental farm of Qlyasan
research Station- College of Agriculture during two growing seasons from November
2008 to may 2010 in a Randomized Complete Block Design (RCBD) with three
replications, to study some genetic parameters in seven pea varieties (Avolla, America,
Jeza, Joneor, Pack land, Wild local arvena and Samara) using half diallel crossing
system. The highest value for number of root nodules/plant, weight of root nodules/plant
produced by the hybrid Joneor× Wild local arvena. The desirable high negative
heterosis value for the character number of days to 50% flowering and maturity
recorded by the hybrid Jeza× Wild local arvena as the result of reducing the values of
these characters in this hybrid comparing to its parental values. Regarding the general
combining ability effect, the parents America, Jeza and Pack land were the best general
combiner in reducing number of days to flowering and maturity. Parent Joneor was
found to be the best general combiner for most studied characters such as plant height,
plant dry weight, number of root nodules/plant, weight of root nodules/plant.The
hybrids Jeza× Wild local arvena and Avolla× Samara recorded maximum negative
value for the characters number of days to 50% flowering and physiological maturity
respectively. Maximum positive value of this effect for the characters plant height and
weight of root nodules/plant exhibited by the hybrid Avolla× Joneor, while the hybrid
Jeza× Wild local arvena showed maximum effect for the characters number of basal
branches/plant, root dry weight/plant. The variance components due to sca was larger
than that of gca for most studied character except number of days to 50% flowering,
recording the ratio of σ2gca/σ2sca to be more than one in these characters.The average
degree of dominance was more than one in most studied characters, confirming the
importance of non additive gene effect in the inheritance of these characters.
Heritability in broad sense was found to be high in most studied characters. Heritability
in narrow sense was high for the characters number of days to 50% flowering,
physiological maturity, while it was moderate for the characters plant height, number of
basal branches/plant, plant dry weight, leaf/stem ratio, dry weight root/plant, number of
root nodules/plant, weight of root nodules/plant.

Key words: Pea, gca, sca, Heterosis.


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