Development of adaptive rice variety to non-tidal swamp: Growth evaluation of backcrossed progenies (BC1F1) and its parents, Inpago 5 and Inpara 8

AbstractRice (Oryza sativa L.) cultivation in non-tidal swamp is severely constrained by abiotic stresses, i.e., submerged stress the vegetative phase and drought generative phase. The development of rice varieties that have dual-tolerant to those stresses can improve adaptability increase productivity. Efforts obtain adaptive under conditions are being carried out selecting parents crossing them, has resulted population BC1F1. research was on April – June 2021 at greenhouse Agriculture Faculty, Sriwijaya University. study aimed evaluate growth BC1F1 progenies parental varieties, Inpago 5 (live well condition) Inpara 8 (inherited Sub1 gene). results showed (plant height number total tillers) influenced genetics parents. While parameters, 5, as a recipient parent, had highest spikelets per panicle (181.42 grains), lowest percentage sterile (25.05%) biomass dry weight (27.88 g). 8, donor average productive tillers (8.34 tillers), took longest time flower (76 days), shortest harvest (115 days). Then, got plant (1348.2 1000 grains (25.49 g), (9.71 Based study, most traits were genetically parents, indicated segregation from plants will be used for second backcrossing (BC2F1) molecular selection using Marker-Assisted Backcrossing (MABC) method gene closest characteristic parent (Inpago 5).Keywords: dual tolerance, Oryza AbstrakBudidaya padi di lahan rawa lebak sangat terkendala dengan cekaman abiotik terendam pada fase vegetatif dan kekeringan generatif. Pengembangan varietas yang memiliki tolerant terhadap tersebut dapat memperbaiki daya adaptasi meningkatkan produktivitasnya. Upaya untuk mendapatkan variietas adaptif kondisi sedang dilakukan melakukan seleksi tetua menyilangkannya, telah menghasilkan aksesi Penelitian dilaksanakan bulan Juni Fakultas Pertanian, Universitas Sriwijaya. Tulisan menyampaikan hasil evaluasi pertumbuhan progeni kedua induk, 8. Hasil penelitian menunjukkan (tinggi tanaman jumlah anakan total) dipengaruhi oleh genetik dari induk. Sementara parameter generatif, (induk resipien) gabah malai tertinggi sebanyak 181,42 butir; persentase hampa terendah sebesar 25,05%; bobot kering biomassa 27,88 g. donor) rata-rata produktif terbanyak (8,34 anakan), waktu berbunga terlama hari), panen tercepat hari). Kemudian rumpun 1348 butir), butir (25,49 berat (9,71 Berdasarkan penelitian, sebagian besat karakteristik populasi secara induk mengindikasi adanya segregasi sifat keduanya. Tanaman akan digunakan silang balik generasi diseleksi molekular menggunakan metode terbaik gen karakter agronomi paling dekat 5.Kata Kunci: toleransi,