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Title

STUDY OF ISFAHAN THYMUS DAENENSIS ACCESSIONS GENETIC DIVERSITY BASED ON KARYOTYPIC CHARACTERISTICS

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Abstract

 THYME (THYMUS VULGARIS L.), IS ONE OF THE MOST IMPORTANT AROMATIC MEDICINAL PLANTS, WHICH HAS WIDELY DISTRIBUTED IN THE OLD WORLD. THE MEDITERRANEAN REGION CAN BE DESCRIBED AS THE CENTRE OF THE GENUS. THYMUS BELONGS TO LAMIACEAE FAMILY AND IS GROWN MOSTLY IN SPAIN AND TURKEY [1]. KNOWLEDGE ABOUT GENETIC DIVERSITY AMONG BREEDING MATERIALS COULD BE AN INVALUABLE HELP IN THE STRATEGIES OF IMPROVEMENT [2]. SINCE THE 93% OF WILD MEDICINAL PLANTS ARE IN IMMINENT DANGER OF EXTINCTION, THE PRESENT STUDY INVESTIGATED GENETIC DIVERSITY IN THIS HERB USING THREE THYMUS SP. ACCESSIONS COLLECTED FROM DIFFERENT REGIONS IN ISFAHAN USING KARYOTYPIC CHARACTERISTICS. SOME TRAITS INCLUDING TL, LA, SA, AR AND CI WERE DETERMINED FOR EACH ACCESSION BY USING MICROMEASURE SOFTWARE VERSION 3.3, AND SOME OTHER TRAITS INCLUDES %RL, %LA, %SA AND %TF WERE CALCULATED FOR EACH ACCESSION BY EXCEL SOFTWARE. SIGNIFICANT VARIATION FOR SOME TRAITS WAS OBSERVED AMONG ACCESSIONS BY VARIANCE ANALYSIS. KARYOTYPE STUDIES FOR THYMUS GENUS SHOWED THAT ALL THREE ACCESSIONS THYMUS DAENENSIS WERE DIPLOID (2N=2X=30). KARYOTYPE FORMULAS OF THE ACCESSIONS WERE 15M. ACCORDING TO STEBBINS CLASSIFICATION, ALL THE ACCESSIONS PLACED IN THE A1CATEGORY [3]. USING PRINCIPAL COMPONENTS ANALYSIS, THE FIRST TWO COMPONENTS DETERMINED %99.92 OF THE TOTAL VARIANCE. IN THE FIRST COMPONENT, TOTAL LENGTH, THE LENGTH OF LONG ARM AND SHORT ARM OF CHROMOSOME, WITH THE HIGHEST EIGEN VECTORS WERE THE MOST IMPORTANT TRAITS. CENTROMERE INDEX AND THE ARM RATIO HAD THE MOST IMPORTANT ROLE FOR TOTAL VARIATION IN THE SECOND COMPONENT.

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