Joint International Conference on Long-term Experiments ...

COMBINING ABILITY STUDIES IN A SEVEN- PARENTAL DIALLEL
CROSS OF DIFFERENT PEAS VARIETES
(PISUM SATIVUM L.)
Nóra Mendler-Drienyovszki, Mándi Lajosné, Katalin Magyar-Tábori,
Györgyi Csontos
Research Centre of University of Debrecen,
Westsik V. u. 4-6. H-4400. Nyíregyháza, Hungary
ABSTRACT
Results of a 7x7 diallel cross containing parents and F1 without reciprocals are
discussed after Model 1 and Method 2 of Griffing. Affecting three yielding capacity
traits were studied and analized: pod length, pod per plant, seed per pod.
The difference between genotypes in every traits were significant (P=0,01).
Predominance of additive effects in tested features were typical excluding pod pr plant.
The phenotypical performace is grater ofthe parents, which have higher GCA values.
In general the effects of SCA isn't correlate with performance of F1 generation.
INTRODUCTION
Peas have been grown as an important source of animal feed and human food for many
centuries. Over this time, pea has been selected for these uses. Several thousand
varieties exist throughout the world.
The majority part of our most successful pea varieties are more or less near
relationship with each other. The genetical background of high yield capacity can be the
same because of the crosses of the best pea cultivars seldom result in better new line
than the parents. However it can be supposed that the parents with good combining
ability can produced better lines than the average in a later generation. It's important in
the plan of different cross- combinations to choose the parents purposefully. In practice
the genotypes which hold a good phenotype values, not to be sure of inheritance their
desired traits, but another not so good varieties would be valuable like a parent in the
diallel cross.
The diallel analysis is a quantitative genetics method in plant breeding where we
can estimate the interaction between enviroment and genes in a population or the
offsprings from the selected paretnts (Mohay, 1986).
The diallel crosses are used in generally from mating modells, because we can get
the most completly genetic information about the genotypes.
The base methods are the analysis of Griffing (1956), Hayman and Jinks (1954), which
is based on diallel cross.
These diallel methods are popular all over the world, and it can be used
successfully in other species, for example maize (Daniel and Bajtai, 1975, Pepó et al.
1989), sunflower (Füredi and Frank, 1981), wheat (Matuz, 1976, Du et al. 1999), pea
(Csizmadia, 1985, Lőkös, 1985).
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