ARTICLE IN PRESS

TRUE-TO-TYPE VERSION 2 – HIGH RESOLUTION GENOTYPING PLATFORM FOR PARENTAL IDENTIFICATION IN OIL PALM

TING NGOOT-CHIN1; LESLIE LOW ENG-TI1; JAAP BUNTJER2; MEILINA ONG-ABDULLAH1; CHAN PEK-LAN1; ZULKIFLI YAAKUB1; JARED ORDWAY2 and RAJINDER SINGH1*

DOI: https://doi.org/10.21894/jopr.2025.0018
Received: 13 August 2024   Accepted: 3 December 2024   Published Online: 25 March 2025
ABSTRACT

This study reports on developing the TRUE-TO-TYPE VERSION 2 DNA genotyping platform. Relative to SureSawitTM TRUE-TO-TYPE (Version 1), the new platform has improved genotyping resolution for high-precision parental identification in Elaeis guineensis, allowing accurate assignment of a palm to their actual parents even if the parentage information is not available. The feature was developed by increasing the marker-set from 24 (in Version 1) to 108 stably inherited SNPs. The optimal performance of TRUETO- TYPE VERSION 2 was confirmed by analysing the genotypes of 2,301 offspring from three genetic backgrounds. A total of 17 panels with different numbers of SNP markers were evaluated for this purpose. The finalised panel was validated in 460 offspring and 41 candidate parents from 20 families of diverse genetic backgrounds. Our data demonstrated >99.4% accuracy in predicting the true parents for the palm materials analysed using TRUE-TO-TYPE VERSION 2. The platform retains the ability to detect illegitimates and track genetic lineage accurately. It is a quality control tool for managing palm materials in seedgardens, breeding programs, commercial nurseries and tissue-culture laboratories. The genetic information obtained will also facilitate the establishment of a comprehensive DNA fingerprint database for the palm materials.

KEYWORDS:


1 Malaysian Palm Oil Board,
6, Persiaran Institusi, Bandar Baru Bangi,
43000 Kajang, Selangor, Malaysia.

2 Orion Genomics LLC,
4041 Forest Park Ave, St. Louis,
MO 63108, Missouri, USA.

* Corresponding author e-mail: rajinder@mpob.gov.my