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- Title
Occurrence of triploids in oil palm and their origin.
- Authors
Pomiès, V; Turnbull, N; Squin, S Le; Syahputra, I; Suryana, E; Durand-Gasselin, T; Cochard, B; Bakry, F
- Abstract
Background and Aims Oil palms showing exceptional vigour and dubbed as 'giant palms' were identified in some progeny during breeding. A panel of phenotypical traits were studied to characterize these trees. The hypothesis that gigantism and other anomalies might be linked to polyploidy was investigated. Methods Twenty sib pairs of palms from different crosses, each comprising a giant and a normal oil palm, were studied by flow cytometry with rice 'Nipponbare' as standard reference. In parallel, palms were assessed in the field using 11 phenotypic traits. A principal component analysis (PCA) was conducted to define relationships between these phenotypical traits, and a linear discriminant analysis (LDA) to predict ploidy level and giant classification. Finally, a co-dominant molecular marker study was implemented to highlight the sexual process leading to the formation of 2 n gametes. Key Results The first group of oil palms presented an oil palm/rice peak ratio of around 4.8 corresponding to diploid oil palms, whereas the second group presented a ratio of around 7, classifying these plants as triploid. The PCA enabled the classification of the plants in three classes: 21 were normal diploid palms; ten were giant diploid palms; while 11 were giant triploid palms. The LDA revealed three predictors for ploidy classification: phyllotaxy, petiole size and circumference of the plant, but surprisingly not height. The molecular study revealed that triploid palms arose from 2 n gametes resulting from the second division restitution of meiosis in parents. Conclusions This study confirms and details the process of sexual polyploidization in oil palm. It also identifies three phenotypical traits to assess the ploidy level of the giant oil palms in the field. In practical terms, our results provide a cheap scientific method to identify polyploid palms in the field.
- Subjects
OIL palm; FISHER discriminant analysis; PALMS; PLANT classification; PRINCIPAL components analysis; SCIENTIFIC method; MICROSATELLITE repeats
- Publication
Annals of Botany, 2023, Vol 131, Issue 1, p17
- ISSN
0305-7364
- Publication type
Article
- DOI
10.1093/aob/mcac036