Genetic control of four enzymes in diploid taro, Colocasia esculenta (L.) Schott

Viet Xuan Nguyen, Hiromichi Yoshino, Makoto Tahara

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2 Citations (Scopus)

Abstract

In order to understand the genetic variation and relationship of taro, Colocasia esculenta (L.) Schott, isozyme analyses were initiated using fertile diploid taro accessions. Polyacrylamide gel electrophoreses were performed on leaf tissue of wild or cultivated taro accessions from Nepal and Thailand, and their progeny to determine genes controlling four enzyme systems: alcohol dehydrogenase, esterase, leucine aminopeptidase and phosphoglucomutase. A total of nine loci with two or three alleles were discovered encoding the four enzymes in leaf tissue among the materials used in this study. The isozymes at the two loci of alcohol dehydrogenase and esterase were in a dimeric form. Observed segregation ratios were generally not significantly different (P > .05) from expected Mendelian segregation ratios; however, distortions were observed at some loci and possible causes were discussed. These findings suggest the presence of allelic variants in other enzyme systems and precise classification of a wide range of diploid taro based on allozyme variations. Most of taro cultivars are triploids, which are considered to have evolved from fertilization of unreduced gametes of a diploid. The genetic analyses of isozymes on the diploids will provide useful information to investigate genetic variation, genetic relationship and evolution of not only diploid but also triploid taro.

Original languageEnglish
Pages (from-to)273-280
Number of pages8
JournalBreeding Science
Volume48
Issue number3
DOIs
Publication statusPublished - Sep 1998

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Keywords

  • Colocasia esculenta
  • Inheritance
  • Isozymes
  • Taro

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Genetics
  • Plant Science

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