Rekayasa, 2022; 15(2): 260-266 ISSN: 0216-9495 (Print) ISSN: 2502-5325 (Online) Karakter Kuantitatif Melon Generasi S0-S4 Siti Rohmatin 1 , Kaswan Badami 1* , Gita Pawana 1 Prodi Agroekoteknologi Fakultas Pertanian Universitas Trunojoyo Madura Jl. Raya Telang No 02 Kamal Bangkalan Madura 69162 Jawa Timur *kaswanbadami@trunojoyo.ac.id DOI: https://doi.org/10.21107/rekayasa.v15i2.15109 ABSTRACT One of the obstacles to melon cultivation is the availability of seeds and the high price of melon seeds. This condition causes the need to assemble superior melon varieties with the expected characters. This study aims to form a pure line of melon with certain superior characteristics and can be proposed as a new high-yielding variety in the open-pollinated category. The research was conducted at the Experimental Garden of the Agrotechnology Study Program, Faculty of Agriculture, Trunojoyo University, Madura, from September-December 2022. This study used a randomized block design method. The treatments used were nine pure lines of melon (PK-669, D-162, PK-361, PK-165, PK-114, D-029, D-5089, PK-211, and comparison). Each treatment was repeated three times, and each experimental unit consisted of 12 plants. Research data were analyzed using analysis of variance (ANOVA) and HSD test α = 0.05. The selection advancement was analyzed by comparing character data for each generation. The research showed that the results of the characterization of ten melon lines S0-S4 generation on the characters of fruit length, fruit diameter, flesh thickness, and melon fruit weight showed a decreasing trend in each generation. The S4 generation (9.17 °brix) in the character of the average sugar content there was an increase that was not significantly different from the S3 generation (9.03 °brix), while the number of seeds in each generation had an average value that was not significantly different but occurred an increase in the number of seeds in the S3 (372) and S4 (381) generations. An increase in one generation of the population in the linear regression equation is estimated to reduce the character of fruit length by 0.50 cm, fruit diameter by 0.465 cm, flesh thickness by 0.140 cm, fruit weight by 0.199 Kg, sugar content by 0.752 °brix, and a number of seeds by 5.4. Key words : inbreeding depression, pure line, selfing, melon plant PENDAHULUAN Melon (Cucumis melo L.) merupakan tanaman buah yang penting dan banyak ditanam diberbagai negara di dunia. Buah melon mempunyai nilai ekonomis tinggi yang dapat ditanam di daerah tropis dan subtropis sehingga banyak diminati oleh masyarakat didalam maupun luar negeri (Makful et al., 2017). Konsumsi buah melon di Indonesia mengalami peningkatan dari tahun ke tahun. Hal ini dapat dilihat dari produksi melon di Indonesia yang juga semakin meningkat. Produksi melon di Indonesia mencapai 117.334 ton pada tahun 2016, 92.434 ton pada tahun 2017, 118.708 ton pada tahun 2018, 122.105 ton pada tahun 2019, dan 138.177 ton pada tahun 2020 (BPS, 2022). Produksi tersebut hanya memenuhi kebutuhan pasar nasional sebesar 40 % (Amzeri et al., 2020). Peningkatan produksi melon mengakibatkan kebutuhan persediaan benih unggul yang semakin meningkat. Salah satu kendala budidaya melon adalah ketersediaan benih dan harga benih melon yang mahal disebabkan masih bergantungnya Indonesia terhadap benih melon impor dari negara di wilayah Asia seperti Jepang, Korea, dan Taiwan (Daryono et al., 2016). Hal ini menyebabkan perlunya upaya memproduksi benih melon dalam negeri, sehingga mendorong adanya pengembangan kultivar tanaman melon. Strategi pemuliaan family curcubitaceae menurut Cardoso (2004) adalah dengan mengembangkan galur tetua melalui penyerbukan sendiri. Strategi persilangan yang efektif tersebut bertujuan untuk mendapatkan galur murni (pure line). Inbreeding dalam beberapa generasi akan REKAYASA Journal of Science and Technology https://journal.trunojoyo.ac.id/rekayasa Article History: Received: April, 23 th 2022; Accepted: July, 30 th 2022 Rekayasa ISSN: 2502-5325 has been Accredited by Ristekdikti (Arjuna) Decree: No. 23/E/KPT/2019 August 8th, 2019 effective until 2023 Cite this as: Rohmatin, S., Badami, K & Pawana, G. (2022). Karakter Kuantitatif Melon Generasi S0-S4. Rekayasa 15 (2). 260-266 pp doi: https://doi.org/10.21107/rekayasa.v15i2.15109 © 2022 Badami