Genetic Relationships in Longan var. Daw as Revealed by Isozyme Analysis

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Ramingwong K
Sirikam P.
Wichaipanich S.
Kowitsangtong K.
Pintaya N.
Kuntalo W.

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Twenty clones of longan var. Daw were fingerprinted, classified and evaluated for phylogenetic relationships using isozyme pattern analysis. Ten enzyme systems were screened. It is found that two enzyme systems failed to be stained in polyacrylamide gel including alcohol dehydrogenase (ADH) and isocitrate dehydrogenase (IDH). The eight enzyme systems that produced clear and reproducible isozyme patterns were selected, including acid phosphatase (ACP), aspartate amino transferase (AAT), esterase (EST), glucose-6-phosphate dehydrogenase (G6PD), glutamate dehydrogenase (GDH), glyceraldehyde-3-phosphate dehydrogenase (G3PD), malate dehydrogenase (MDH) and peroxidase (POX). The number of schematic zymograms were 15, 13, 11, 19, 13, 11, 14 and 9, respectively with the total of 105. At 95% similarity, cluster analysis based on molecular data of band distribution in all samples showed 19 clusters and 1 individual not belonging to any of the clusters. Daw Bai Hod (DBH) and Daw Kan On (DKO) could not be separated with 95% similarity while the rest of the clones could be separated with similarity less than 95%. Daw Kan Kaeng (DKK) and Daw Nam Pueng (DNP) as well as Daw Luang (DLG) and Daw Sukhum (DSK) had 80% similarity. Daw Lum Nam Ping (DLP) and Daw Soy (DSY) had 68% similarity while Daw Nan Sao (DNS) and Daw Ta Noi (DTN) had 64% similarity. Daw Yod Kao (DYK) was the only individual that had 0% similarity and was completely different from the others.

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