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Genetic Diversity of Aromatic Rice Germplasm Revealed By SSR Markers
Saba Jasim Aljumaili1, M Y Rafii1,2, M A Latif3
1Laboratory of Climate-Smart Food Crop Production, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia (UPM), 43400 Serdang, Selangor, Malaysia.
Biomed Research International
|May 9, 2018
Summary
This study analyzed genetic diversity in 50 aromatic rice accessions using simple sequence repeat (SSR) markers. Seven promising accessions were identified for future aromatic rice breeding programs.
Area of Science:
- Genetics
- Agronomy
- Plant Breeding
Background:
- Aromatic rice is highly valued for its unique aroma and quality, commanding higher market prices.
- Understanding genetic diversity is crucial for improving aromatic rice varieties and breeding programs.
Purpose of the Study:
- To quantify genetic divergence among aromatic rice accessions from Malaysia using SSR markers.
- To identify elite aromatic rice accessions for introgression into existing breeding programs.
Main Methods:
- Utilized 32 simple sequence repeat (SSR) markers to analyze 50 aromatic rice accessions and 3 control varieties.
- Employed genetic diversity indices (Shannon index, heterozygosity, Nei's gene diversity) and molecular variance analysis (AMOVA).
- Constructed a dendrogram using UPGMA and Nei's genetic distance to classify accessions.
Main Results:
- High allelic diversity was observed, with mean expected heterozygosity (H) of 0.60 and Nei's gene diversity index of 0.36.
- AMOVA indicated that 89% of variation occurred within populations, suggesting high genetic differentiation.
- Seven accessions (Acc9993, Acc6288, Acc6893, Acc7580, Acc6009, Acc9956, Acc11816) were identified as potential candidates for breeding.
Conclusions:
- The study highlights significant genetic differentiation within the Malaysian aromatic rice germplasm.
- The identified accessions offer valuable genetic resources for developing new aromatic rice varieties with enhanced traits.
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