PARAMETER GENETIK BEBERAPA VARIETAS PADI (Oryza sativa L.) PADA KONDISI MEDIA BERBEDA Genetic parameters of some variety of rice (oryza sativa L.) Conditions on different media Fitrah Ramadhan1, Trisda Kurniawan2, Bakhtiar2 1Mahasiswa Agroteknologi, Fakultas Pertanian, Universitas Syiah Kuala 2Dosen Agroteknologi , Fakultas Pertanian, Universitas Syiah Kuala ABSTRACT The aim of this research were obtain information and gain predictive value of genetic parameters of some rice varieties in different conditions. This research was conducted at the plastic house, Syiah Kuala University farm, from March to July 2013. Experiments using a completely randomized design (CRD) non- factorial, consisting of 5 varieties of upland rice and 3 varieties of lowland rice with 3 replications in each condition, flooded and not flooded conditions. Observations on plant height, number of productive tillers, days to flowering, days to harvesting, panicle length, number of grains per panicle, percentage of grain contains per panicle, grain weight per clum and weighs 100 grains. Data were analyzed to determine the variability, heritability, genetic gain, limits the selection, the correlation and appearance changes. The results showed wide variability genetic in flooded conditions on plant height, number of productive tillers and panicle length, while the not flooded conditions wide genetic variability present in plant height, days to flowering, days to harvesting, panicle length, and the percentage of grains contains per panicle. High heritability values found in all the characters except the percentage of grain containing per panicle in flooded conditions. Genetic gain ranging from high to low at 30 % selection intensity. Plant height was negatively correlated to the number of productive tillers, correlated positively to the character of panicle length and number of grains per panicle. Character number of productive tillers negatively correlated to the character of flowering and correlated positively to the character of the grain weight per clum. Varieties Inpago 6 is a variety with an average change in the appearance of the low. Keyword : Varieties, genetic parameters, different conditions ABSTRAK Penelitian ini bertujuan untuk memperoleh informasi dan mendapatkan nilai duga parameter genetik beberapa varietas padi pada kondisi media berbeda. Penelitian ini dilaksanakan di rumah plastik kebun Percobaan Fakultas Pertanian Universitas Syiah Kuala dari Maret sampai Juli 2013. Percobaan menggunakan Rancangan Acak Lengkap (RAL) non faktorial, terdiri atas 5 varietas padi gogo dan 3 varietas padi sawah dengan 3 ulangan pada masing-masing kondisi, yaitu kondisi tergenang dan kondisi tidak tergenang. Pengamatan meliputi tinggi tanaman, jumlah anakan produktif, umur berbunga, umur panen, panjang malai, jumlah gabah per malai, persentase gabah berisi per malai, bobot gabah isi per rumpun dan bobot 100 butir. Data pengamatan dianalisis untuk mengetahui keragaman, heritabilitas, kemajuan genetik harapan, batas seleksi, korelasi antar karakter dan perubahan penampilan. Hasil penelitian menunjukkan keragaman genetik luas pada kondisi tergenang terdapat pada karakter tinggi tanaman, jumlah anakan produktif dan panjang malai sedangkan pada kondisi tidak tergenang keragaman genetik luas terdapat pada karakter tinggi tanaman, umur berbunga, umur panen, panjang malai, dan persentase gabah berisi per malai. Nilai heritabilitas tinggi terdapat pada semua karakter kecuali persentase gabah berisi per malai pada kondisi tergenang. Kemajuan genetik harapan bervariasi mulai dari tinggi hingga rendah pada intensitas seleksi 30%. Karakter tinggi tanaman berkorelasi negatif terhadap jumlah anakan produktif, berkorelasi positif terhadap karakter panjang malai dan jumlah gabah per malai. Karakter jumlah anakan produktif berkorelasi negatif terhadap karakter umur berbunga dan berkorelasi positif terhadap karakter bobot gabah berisi per rumpun. Varietas Inpago 6 merupakan varietas dengan rata-rata perubahan penampilan paling rendah. Kata kunci : Varietas, parameter genetik, kondisi berbeda