LTR-retrotransposons Tnt1 and T135 Markers Reveal Genetic Diversity and Evolutionary Relationships of Domesticated Peppers

Overview

Journal Theor Appl Genet

Publisher Springer

Specialty Genetics

Date 2009 Jul 21

PMID 19618162

Citations 12

Authors

Sheh May Tam

Veronique Lefebvre

Alain Palloix

Anne-Marie Sage-Palloix

Corinne Mhiri

Marie-Angele Grandbastien

Affiliations

Soon will be listed here.

Abstract

Plant genetic resources often constitute the foundation of successful breeding programs. Pepper (Capsicum annuum L.) is one of the most economically important and diversely utilized Solanaceous crop species worldwide, but less studied compared to tomato and potato. We developed and used molecular markers based on two copia-type retrotransposons, Tnt1 and T135, in a set of Capsicum species and wild relatives from diverse geographical origins. Results showed that Tnt1 and T135 insertion polymorphisms are very useful for studying genetic diversity and relationships within and among pepper species. Clusters of accessions correspond to cultivar types based on fruit shape, pungency, geographic origin and pedigree. Genetic diversity values, normally reflective of past transposition activity and population dynamics, showed positive correlation with the average number of insertions per accession. Similar evolutionary relationships are observed to that inferred by previous karyosystematics studies. These observations support the possibility that retrotransposons have contributed to genome inflation during Capsicum evolution.

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