Ioana PORUMB, Florin RUSSU, Nicolae TRITEAN
For efficient breeding in order to obtain new spring barley genotypes, we proposed an inventory of the biological material used for breeding programs for the identification of genotypes, which could be used as genitors in future hybridization works. Periodic inventory of the germplasm collection regarding the existing variability, appears to be necessary due to new entries (new genotypes and lines), in order to assess them in terms of some morphological traits and stability of yield components. The variability of the germplasm collection for spring barley from Turda, was achieved using the main parameters of variability (mean, standard deviation, coefficient of variation, the minimum and maximum) to the following traits: flag leaf length and width, plant height, grain weight / plant and T.K.W. The collection of germplasm study involves a large volume of work, such analysis on a large number of genotypes (540) have not been made before at A.R.D.S. Turda. There were analysed 10 morphological and production traits. In this paper will be presented only some of the traits mentioned above regarding some of the most representative genotypes from the collection. The decrease of plant height is a priority of the breeding program of spring barley in Turda. Following this direction, there have been also calculated some derivatives genetic parameters (heritability coefficient, dominance) in a set of six hybrid combinations. Following measurements it was able to observe that in the germplasm collection there is an important source of morphology characters variation, but also for the quantitative production traits (T.K.W., grain weight / plant) which can be used in future crosses for the obtain of new genotypes that provide a transgressive segregation. Regarded as a simple parameter, coefficient of heritability, has not great importance in assessing some traits, but along with the pressure of selection and variability, can provide information on the probability of gene transmission which is desired to be obtained in the new genotypes. The heritability coefficient in narrow sense for plant height (0.57), indicating a major involvement in controlling plant height, which would suggest that the selection work for this trait could start from early generations. In this study, we can say that through a judicious choice of the parents and through an appropriate selection pressure, there can be obtained new spring barley genotypes, to bring more in terms of quantity. However we must work towards improving the collection with new entries to bring additional variability.
genotype, heritability coefficient, spring barley, TKW
Presentation: poster