The purity of seeds can be identified from the traits inherited from their parental lines. Hence, contamination may occur at the crossing step due to unshared similarities with their parents. This research aims to measure the genetic purity of several genotypes obtained from crosses between upland and lowland rice through the banding pattern differences among the genotype samples by using Simple Sequence Repeats (SSR) markers. Taking the leaf samples was carried out at the experimental field, while the marker analysis was conducted in the Plant Biotechnology Laboratory. In this research, 8 (eight) genotypes obtained from crossing, comprising F1, F2, and BC1 along with 4 (four) of their parents from upland rice and lowland rice, were tested using 6 (six) drought-specific SSR primers of RM5, RM211, RM232, RM249, RM255, and RM258. The banding pattern of the electrophoresis results on the 12 rice genotypes showed clear, unsmeared quality. Based on the results of distance and genetic similarities, the 12 genotypes could be classified into 4 (four) clusters in the dendrogram. Cluster I consists of the Situ Bagendit and BC1 TWCH varieties, Cluster II the Towuti variety, Cluster III the Ciherang, Cibogo, F1 SBCH, F1 SBCB, and F1 TWCH varieties, and Cluster IV the F2 SBCH, F2 TWCH, F2 SBCB, and BC1 SBCH varieties.

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• Introgressing photoperiod/thermo-sensitive genic male sterile gene into Basmati 370 rice
  Beatrice Nyarangi Nyankemba, Edith Esther Arunga, Paul Njiruh Nthakanio
  Journal of Experimental Biology and Agricultural Sciences.2024; 12(5): 756.     CrossRef

This study estimated the genetic variability and gene action of several traits in the F₄ and F₅ rice populations to determine a trait for selection program. The trait of date to flowering and date to harvesting had narrow genetic variability, whereas trait productive tillers, number of fertile grain, and total grains had moderate to wide genetic variability. Genetic variability in trait number of fertile grain and total grains showed decreased in F₅ generation compare to the F₄ generation, whereas trait productive tillers, date to flowering, and date to harvesting showed an increase. Additive gene action with duplicate and complementary epistasis was found in all traits, except for trait productive tillers only showed additive gene action with duplicate epistasis. Kurtosis less than 3 was found in all traits which indicate many genes control the traits. The number of fertile grain trait showed wide genetic variability which decreased in F₅ generation compare to the F₄ generation, and there is an additive gene action with duplicate epistasis. It indicates selection will be effective with the trait of number of fertile grain.

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• Genetic Purity Analysis Using Polymorphic SSR Markers in Rice Genotypes (Oryza sativa L.) and Their Confirmation for the Parental Lines
  Afifuddin Latif Adiredjo, Noer Rahmi Ardiarini, Damanhuri
  Plant Breeding and Biotechnology.2023; 11(3): 220.     CrossRef