GENETIC FINGERPRINT ESTABLISHED FOR THE SELECTED ALFALFA GENOTYPES USING MOLECULAR MARKERS

OBJECTIVES Assessment intra- and interspecific variability at molecular level The work methods used were: Molecular techniques of genetic variability detection (extraction of genomic DNA, enzymatic amplification through the PCR reaction using 13 RAPD, 3 SSR and 5 ISSR primers, analysis of the reaction products through agarose gel electrophoresis); Statistical-mathematical methods of result processing and interpretation.

Polymorphism rate for the alfalfa genotypes using ISSR primers Assessment of interspecific variability using ISSR molecular markers

UPGMA clustering of alfalfa genotypes using the ISSR primers

We identified 22 alleles present in all the 30 genotypes studied. These alleles may be considered ISSR specific markers for alfalfa

Assessment of intergenotypical variability using RAPD molecular markers Polymorphism rate for the alfalfa genotypes using RAPD primers

UPGMA clustering of alfalfa genotypes using RAPD primers

The 20 alleles identified in all the 30 genotypes studied may be considered RAPD specific markers for alfalfa Specific RAPD alleles identified in studied alfalfa genotypes

The results of the analyses performed using two primer categories proved that we identified, in some genotypes from the collection studied, specific DNA fragments These bands may be used as DNA markers in the identification of alfalfa genotypes

In order to assess the intraspecific genetic diversity, we tested 16 ISSR primers and used only three of them: AFca 11, AFct 32 and AFct 45.

Estimated heterozygoty, effective number of alleles and diversity index in alfalfa genotypes studied using SSR primers

CONCLUSIONS -Genomic DNA amplification from 30 genotypes with 5 ISSR primers, generated 117 amplicons, of which 95 were polymorphic markers, the mean – 18.2; -22 ISSR markers, present in all the 30 genotypes studied, may be considered specific for alfalfa Variance analysis for the alfalfa studied genotypes, from the viewpoint of the bands generated by the ISSR primers, recorded high and significant values in the cultivars: Cosmina, Sigma, Super and the: F , F , F lines etc The results obtained with the help of the five ISSR primers, prove the existence of a high genetic variability among the genotypes analyzed, which could be efficiently explored in alfalfa breeding programs. -20 fragments amplified in all the 30 genotypes studied may be considered specific RAPD markers for alfalfa;

The RAPD analysis with the help of the 13 primers shows the existence of a high genetic variability among the genotypes studied, which could be efficiently explored in alfalfa breeding programs; The results of the genetic diversity assessment at loci level showed the highest frequent heterozygosity in F (52.70 %), Cosmina (51.30 %), F (51.30 %), Satelit (46.70 %) and Dorina (43.30 %) genotypes; The highest frequent allele homozygosity at loci level was observed in F (83.30 %), Sigma (82.00 %), Alina (75.30 %), Stolo 13 (74.70 %) and F (74.70 %) genotypes; Also, in the studied genotypes, we observed the existence of a direct correlation between the estimated heterozygosity and the effective number of alleles, so that the genotypes having several alleles/locus record a higher frequency of heterozygosity, too;

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