This study aims to determine the quantitative character of the mutant genotype (M2) and the genetic diversity of the mutant (M2) due to gamma ray irradiation. This experiment was carried out from June to October 2021 in Nyurlembang Village, Narmada District, West Lombok Regency, West Nusa Tenggara, using a Randomized Block Design (RAK) in a partitioned design with a total of 27 treatments consisting of 24 mutant plant genotypes and 3 comparison plants. The results of the observations were analyzed using analysis of variance at a level of 5%, then significantly different treatments were further tested using the Central Significant Difference (BNT) test at a level of 5%. The results showed that gamma ray irradiation caused differences in the characters of each genotype, including the character of plant height, panicle length, number of empty grains, flowering age, and harvest age. The genetic diversity of the M2 generation mutant brown rice (Inpago Unram Satu) due to gamma ray irradiation of 200 Gy shows the character of the number of filled grain, the number of empty grains, and the weight of the filled grain, while other characters have a narrow genetic variation.

The aim of this study was to obtain superior lines that had higher yields and shorter harvesting ages than their  parents. The research was conducted in Saribaye Village, Lingsar, West Lombok Districts, from February to July 2020. The study used a Single Plant Design with the treatment of the M1 G16 mutant population at irradiation doses of 200 Gy, 300 Gy, 400 Gy and 500 Gy and  parent (G16 line) as a control. Each treatment planted 200 seeds while the control was repeated three times. The variables observed included the number of productive tillers (saplings), panicle length (cm), number of filled and empty grains per panicle (grains), age of harvest (HSS), weight of 100 grains (g) and weight of filled grain per clump (g). . The value of genetic variance is calculated based on the reduction of phenotype variance with environmental variation (Mangoendidjojo, 2007). Determination of the potential for superior line candidates is done by setting the selection limit value (Xs) according to Kuswanto and Waluyo (2012). The selected genotype is a genotype that has a production value of more than Xs and an age of less than Xs. The results showed that there was an increase in genetic variance due to gamma ray irradiation treatment. A total of three mutant genotypes were successfully selected as candidates for superior strains, namely M1G16-9D3, M1G16-14D3, M1G16-27D3. The three mutant genotypes have the opportunity to be further developed into superior varieties with high yield potential and early maturity.

Red rice is one of the important functional food sources because its anthocyanin content is very beneficial for human health. One of the processes to produce new superior varieties of rice is by cross-breeding. The aim of this study was to determine the agronomic performance of the promising lines of red rice resulted from crossing of IPB3S variety with the promising line of red rice compared with the parents and comparison genotypes in the medium elevation lands. The experiment was carried out in June - September 2022 in medium lowland rice fields (375 m asl) in Central Lombok district, NTB, Indonesia, which was designed using a Randomized Block Design (RCBD) consisting of 14 treatments, namely 9 ideal type red rice lines resulted from Pedigree F5 selection, 1 promising line of red rice from crosses between Kenya and Angka, two parents (the promising line of paddy red rice “GH F2BC4P19-36”, and IPB3S variety), and two control varieties (Situ Patenggang and Inpago Unram 1), repeated 3 times. Observation variables included plant height, days to harvest, number of productive and non-productive tillers, length of panicles, number of filled and unfilled grains per panicle, weight of 100 grains, grain weight per clump and yield potential (tons/ha). The results showed that the red rice line G6 (F5 IPB3S/F2BC4P19-63// Fat/F2BC4P19-63-PD3/17) showed higher grain yield potential (4.79 t/ha) compared to the two parents, namely IPB3S (3.34 t /ha), GH parent (3.27 t/ha), Situ Patenggang (3.92 t/ha) and Inpago Unram 1 (3.35 t/ha). Plant height, number of productive and non-productive tillers per clump, panicle length, numbers of filled and unfilled grains per panicle, grain weight per clump and potential grain yield per hectare were significantly different between genotypes while days to harvest and 100-grain weight were not significantly different.