Genetic variation and phylogenetic relationships in East and South Asian melons, Cucumis melo L., based on the analysis of five isozymes |
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Authors: | Yukari Akashi Naomi Fukuda Tadayuki Wako Masaharu Masuda Kenji Kato |
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Institution: | (1) Faculty of Agriculture, Okayama University, 1-1-1 Tsushima-Naka, Okayama 700-8530, Japan;(2) National Research Institute of Vegetables, Ornamental Plants and Tea, 360 Kusawa, Ano, Mie 514-2392, Japan |
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Abstract: | Genetic structure and phylogenetic relationships in East and South Asian melons were analyzed, based on the geographical variation
of five isozymes. The analysis of Indian melon accessions showed a continuous variation in seed length, ranging from 4 to
13 mm. Most of the East Asian melons, vars. makuwa and conomon, were classified as the small seed type with seed length shorter than 9 mm. The frequency of the small seed type increased
from the west to the east in India. Allelic variation was detected at a total of nine loci of five isozymes among 114 melon
accessions. Gene diversity calculated for the nine loci indicated that Indian melon was rich in genetic variation, which decreased
from India towards the east. Clear geographical variation was detected in two enzymes, APS and6-PGDH. Pgd-1
1 and Ap-3
1 were frequent in India and Myanmar, while most of the melons in Laos, China, Korea and Japan carried Pgd-1
3 and Ap-3
3, except var. inodorusin China. Among the latter two alleles, the frequency of Ap-3
3 was more than 50% in the small seed type in north and east India, indicating that vars. makuwa and conomon were related to the small seed type in these areas. It was also suggested that the small seed type with wet tolerance originated
in central India and was selected under wet condition in the east.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | Cucumis melo var conomon var makuwa genetic variation isozymes phylogenetic relationships |
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