Diallel method was use to study quantitative characters of rice. The output of the analysis will provide genetic information to select further generation. The results were Grain Protein Content (GPC) and filled grain characters in rice determined by epistatic gene effect. Over dominant had been show in day of harvest while that in plant height was partially dominant, and in panicles length were partially dominant and close to complete dominant.

The objective of this research was to analyze the risk of rice seed breeder in Pringsewu District. The research was conducted in Pringsewu District. The location was determined purposively, considering that Pringsewu Regency was a rice producing center in Lampung Province. Based on the calculation, the study sample consisted of 37 rice breeders and 37 non-breeders. The data collection of this research was conducted in November 2017. This research employed variation coefficient method to analyze risk. The coefficient of variation (CV) is a measure of the relative risk obtained by dividing the standard deviation by the expected value. The results of the research showed that the level of risk of rice farming in Pringsewu regency for non-paddy breeder farmers was higher than paddy farmer breeders.

Program perbaikan padi di Indonesia salah satunya ditujukan untuk mengembangkan varietas unggul dengan bulir panjang ramping. Penelitian ini dilakukan untuk menduga parameter genetik yang meliputi aksi gen, jumlah gen pengendali, keragaman genetik, heritabilitas, kemajuan genetik dan hubungan antara komponen hasil dan hasil pada generasi F2 persilangan Inpari 31 x Basmati Delta 9. Percobaan dilaksanakan di lahan percobaan Fakultas Pertanian Universitas Jenderal Soedirman Purwokerto Jawa Tengah Indonesia. Bahan genetik yang digunakan adalah benih populasi F2 yang berasal dari persilangan Inpari 31 dan Basmati Delta 9, dan dua genotipe tetua. Data sifat-sifat komponen hasil dan hasil digunakan untuk analisis skewness, kurtosis, keragaman genetik, heritabilitas, kemajuan genetik dan hubungan antara. Hasil penelitian menunjukkan aksi gen aditif dan aksi gen epistasis komplementer mengendalikan sifat komponen hasil dan hasil. Diketahui bahwa sifat komponen hasil dan hasil dikendalikan oleh sedikit gen atau banyak gen tergantung sifat yang diamati. Sifat jumlah anakan produktif dan bobot gabah per malai menunjukkan keragaman genetik luas, heritabilitas dan kemajuan genetik tinggi. Kedua sifat ini menunjukkan korelasi positif nyata dan berpengaruh langsung terhadap hasil sehingga dapat dijadikan sifat antara dalam seleksi padi daya hasil tinggi dengan bentuk beras panjang dan ramping.

Current research was conducted with the objectives to identify the utmost traits that may be beneficial for the higher productivity of the grains on high protein content genotypes lines by path coefficient. Path coefficient can define coefficient correlation directly and indirectly to gain information about nature relationship between yield component and protein content to grain yield. Research material consisted of 61 selected plants from G39×Ciherang and 66 selected plants from Mentik Wangi×G39 at F4 generation. Plants were planted in Banyumas in May 2011. Number of panicles per plant, panicle length, 1000 g of grain weight, percentage of filled grain per panicle, protein content, and grain yield were correlated by using Pearson correlation and were followed by path coefficient. Number of panicles per plant, panicle length, 1000 g of grain weight, percentage filled grain per panicle, and protein content were used as dependent variable, while grain yield was used as independent variable. The result showed that protein content in both populations was not correlated with all yield components. The numbers of panicles, followed by panicle length, had highest positive direct effect to yield. The number of panicle was a positive mediator variable to yield from another variable.