Lampung Provinceis one of robusta coffee production center and a small part of arabica coffee production. Coffee plant propagation can be done vegetatively and generatively, to make garden of seeds entres, it is required seeds thatcan be used as rootstock or as a plant propagation. Coffee seeds have long germ time, caused by physical dormancy.Coconut water is one of the natural ingredients, containing hormones like cytokines, auxins and gibberellins that can stimulate germination and plant growth. The purpose of this research is to know the difference of germination time and to get the right coconut water concentration to accelerate the seed germination of Arabica coffee and Robusta coffee, and also to know the interaction between coffee type and coconut water concentration.The research was conducted in August-November 2016, in PlantLaboratory 1 and Green House of Lampung State Polytechnic. Experiments using Completely Randomized Designwith two factors and three replications.The first factor is coffee varieties (K) with two varieties, Arabica Coffee / Sigarar utang (K1) and Robusta Coffee / BP 42 x BP 358 (K2). The second factor is the concentration of coconut water with five concentration, 0% (A0), 25% (A1), 50% (A2), 75% (A3), 100% (A4).Each experiment uses 20 seeds, total seed required for all experiment is 600 seed coffee. The variables observed when sprouts appear, percentage germinated, when cotyledon rupture, simultaneity grow (K ST ) and growth speed (K CT ). The result of variance analysis showed that the treatment of coffee varieties only had a significant effect on the observation variables when sprouts appear, cotyledon rupture, and the simultaneity grow, whereas the coconut water concentration treatment had no significant effect on the whole observation variable. Test results of LSD α 5% Arabica coffee varieties more quickly sprouts appear, cotyledon rupture and the simultaneity grow than Robusta coffee.
Pada tahap seleksi pada pemuliaan dengan induksi mutasi iradiasi sinar gamma, dibutuhkan benih hasil generasi sebelumnya untuk dapat ditanam di lapangan agar memperoleh generasi mutan selanjutnya. Benih sebelum ditanam telah mengalami periode penyimpanan, selama masa penyimpanan jika kondisi suhu, kelembaban dan wadah penyimpanan tidak tepat maka akan mempengaruhi viabilitas dan vigor benih yang dapat menurunkan daya berkecambah benih di lapangan. Pengujian untuk mengetahui vigor benih dapat dengan melakukan uji konduktivitas/Daya hantar listrik (DHL). Tujuan penelitian ini adalah untuk mengetahui nilai konduktivitas tiap genotip mutan generasi ke tiga dan persentase daya berkecambah benih kedelai hitam selama periode simpan. Penelitian ini menggunakan rancangan acak lengkap (RAL) non faktorial yang dengan 10 Genotip mutan dan 1 Kontrol (tanpa iradiasi), dan setiap perlakuan di ulang sebanyak empat kali. Variabel pengamatan adalah Konduktivitas/Daya hantar listrik, Daya berkecambah, Kecepatan tumbuh, Keserempakan tumbuh, Indeks vigor, dan Potensi tumbuh maksimum. Berdasarkan uji konduktivitas/DHL, genotip dengan nilai Konduktivitas/DHL tinggi maka daya berkecambah memiliki persentase rendah, namun persentase daya berkecambah masih di atas 80% seama periode simpan, sehingga diharapkan masih memiliki kemampuan berkecambah tinggi di lapangan. Kata Kunci: Daya hantar listrik, Kedelai hitam, dan Konduktivitas.
Tanaman sedap malam diperbanyak menggunakan umbi yang merupakan batang semu yang berubah bentuk dan fungsi sebagai penyimpanan cadangan makanan untuk pertumbuhan dan perkembangan. Penelitian dilaksanakan di lahan Politeknik Negeri Lampung pada bulan Mei 2017 sampai Maret 2018. Penilitian ini menggunakan Rancangan Kelompok Teracak Sempurna dengan dua faktor perlakuan. Faktor pertama terdiri dari diameter ukuran yaitu besar (1,6 - 2 cm), sedang (1,4 - 1,5 cm) dan kecil (1,3 - 1 cm). Faktor kedua terdiri dari perlakuan zat pengatur tumbuh Atonik yaitu 0 (tanpa perlakuan), 1 ml.l-1 dan 3 ml.l-1. Hasil penelitian ini menunjukkan bahwa ukuran umbi besar (1,6 cm - 2 cm) menghasilkan panjang tanaman (38,9 cm), jumlah daun (16,1 helai), lebar daun (1,9 cm) dan jumlah anakan (9,8 tunas) yang tertinggi serta menghasilkan umur tanaman mengeluarkan malai bunga (24,9 MST) dan umur mekar bunga (28,3 MST) yang lebih cepat. Ukuran umbi sedang (1,4 cm - 1,5 cm) dan kecil (1 cm - 1,3 cm) menghasilkan panjang tangkai bunga terpanjang (79,8 cm dan 86,6 cm).
The number of black soybean varieties in Indonesia is less than the yellow one. Black soybeans contain anthocyanin which is good for health. Black soybean is also the raw material of soy sauce and other food processing. The genetic diversity of black soybean varieties needs to be increased to improve the genetic using plant breeding. The mutation is a method of plant breeding to produce a new variety. This research aims to get the high production genotypes and the observational variables that are used for M3 selection. This research used a non-factorial randomized block design. The treatments were 0 Gy, 50 Gy, 100 Gy, 150 Gy, 200 Gy that repeated three times, so was obtain 15 experimental units, with each experimental unit contains 6 rows and consist of 4 plants. The seven observation variables that consist of plant height; the number of branches, flowering age, number of pods, harvesting age, the weight of 100 grains, and the weight of seeds per plant were analyzed for the diversity using NTSYS software, and the coefficient of genotype diversity was calculated. The genotypes that had high production at the 50 Gy dose were 1 (11), 4 (25), 6 (25), and 2 (26); for the 100 Gy dose were 1 (14), 6 (25), 1 (11), 4 (1); for the 150 Gy dose were 3 (19), 5 (10), and 6 (1); and for the dose 200 Gy were 1 (19) and 1 (26), and the observational variables that are selected for M3 selection were the number of branches, number of pods, and seed weight per plant.
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