New Zealand Journal of Crop and Horticultural Science abstracts

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Genetically controlled branching corms of taro (Colocasia esculenta)

A. Ivancic

Faculty of Agriculture
University of Maribor
Vrbanska 30
2000 Maribor, Slovenia
email: anton.ivancic@uni-mb.si

J. Quero Garcia

CIRAD
34398 Montpellier cedex 01
France

V. Lebot

CIRAD
P.O. Box 946
Port Vila, Vanuatu

Abstract  Branching in taro (Colocasia esculenta) corms is a complex, undesired, and rare trait, which is expressed because of proliferation of lateral buds. The evaluation of the Vanuatu national taro germplasm collection showed that the frequency of this trait was significantly high (9.51% of the accessions were characterised by genetically controlled branching). Such a high frequency can be considered as an indication of close relationships among the majority of the Vanuatu cultivars. The expression of branching depends on the genetic structure, specific environmental conditions, interactions between the genetic structure and the environment, and interactions between various developmental stages of a particular genotype and the environment. The genetic control is complex and involves the interaction of at least two loci. The present study suggests that the existing genetic diversity of taro in Vanuatu (and probably also in other geographically isolated Pacific areas) is insufficient for a successful long-term breeding programme and should include introductions from other countries, especially from the centres of diversity.

Keywords  taro; Colocasia esculenta; crop improvement; genetic diversity; branched corms

H03061; Received 11 June 2003; accepted 26 February 2004; Online publication date 15 June 2004
New Zealand Journal of Crop and Horticultural Science, 2004, Vol. 32: 167-177
0014-0671/04/3202-0167 $7.00 © The Royal Society of New Zealand 2004

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