The genetic control of rice resistance has been extensively studied, but how the resistance mechanism is genetically controlled has received less attention. This study revealed that the rice resistance mechanism toward brown planthopper was genetically controlled by several genes with several mendelian patterns. The tolerance mechanism is controlled by three complementary genes; this is confirmed by QTL analysis, whereas the Antibiosis is controlled by three separate loci on chromosomes 2, 8, and 11. The antixenosis was controlled by polygenic, but detected locus only on chromosome 3, with minor effects.
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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
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