Geographical differentiation of Asian taro, Colacasia esculenta (L.) Schott, detected by RAPD and isozyme analyses |
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Authors: | Toshinori Ochiai Viet Xuan Nguyen Makoto Tahara Hiromichi Yoshino |
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Institution: | (1) Faculty of Agriculture, Okayama University, Okayama 700-8530, Japan;(2) Faculty of Agro-Biology, Hanoi National Pedagogic University, Hanoi, Vietnam |
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Abstract: | Geographical differentiation and phylogenetic relationships of Asian taros, Colocasia esculenta (L.) Schott, and related species were analyzed by random amplified polymorphic DNA (RAPD) and isozymes of 13 enzyme systems
with special interest in the accessions from the Yunnan area of China, which supposedly has served the secondary center of
taro diversification and dispersal into the temperate Far East Asia. The RAPD analysis was found to be better suited for detecting
genetic differences within taros and among its related species. However, both RAPD and isozyme analyses estimated quite similar
genetic relationships within taros and between related species. Genetic differentiation was evident in the taro accessions
of Nepal, Yunnan and other Asian areas; but, phylogenetic relationships between the differentiated taro groups were not clearly
determined. When taro cultivation was introduced to a new area, only a small fraction of genetic variability in heterogeneous
taro populations was transferred possibly causing random differentiation among locally adapted taro populations. Some of the
Yunnan and Japanese accessions were found to be direct descendants of the common triploid population. Further analysis on
taros from the eastern China and Korea is necessary to clarify the Yunnan's role in taro diversification and dispersal. The
significant local differentiation in Asian taros was clearly demonstrated by RAPD and isozyme analyses in this study, and
the results of this study will serve as a base to establish evolutionary and genetic relationships among Asian taros.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | Colacasia esculenta differentiation isozyme RAPD Yunnan |
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