SELECTION OF VEGETATIVE AND GENERATIVE CHARACTERS OF ARABICA COFFEE BY USING SEQUENTIAL PATH ANALYSIS AND STRUCTURAL EQUATION MODELS
Authors: WARDIANA EDI , PRANOWO DIBYO 
Published: June 2020

<p>ABSTRACT<br />Interrelations among vegetative, generative and yield characters in<br />coffee plantation is important in breeding and selection programs.<br />Interrelationships among these characters are the causal model and it can<br />be analyzed by Sequential Path Analysis (SPA). This research was carried<br />out at Pakuwon Experimental Station located at 450 m above sea level, in<br />Latosol soil type with B type of climate, from December 2010 to April<br />2012. The objectives of this research is to analyze the direct or indirect<br />influence of several vegetative and generative characters on yield<br />characters of Arabica coffee through the application of SPA and Structural<br />Equation Models (SEM). The observation method with systematic<br />sampling on 40 Arabica coffee plants of Kartika 1 and Kartika 2 varieties<br />were used in this study. The results showed that the number of cherries of<br />Arabica coffee var. Kartika 1 and 2 population in Pakuwon Experimental<br />Station were affected directly by generative and indirectly by vegetative<br />characters. Plant height and stem girth can be used as positive selection<br />criteria for high yielding at vegetatite phase, while the character of width<br />canophy can be used as negative selection criteria. In generative phase, the<br />character of quantity of productive branches and the amount of berries and<br />flower cluster can be used as positive selection criteria.<br />Keywords: Coffea arabica, selection, vegetative, generative, yield,<br />sequential path analysis, structural equation models</p><p>ABSTRAK<br />Keterkaitan antara karakter vegetatif, generatif dan hasil pada<br />tanaman kopi merupakan hal penting dalam program pemuliaan dan<br />seleksi. Model saling keterkaitan antar karakter tersebut adalah model<br />sebab-akibat dan dapat dianalisis melalui Analisis Lintasan Bertahap<br />(ALB). Penelitian ini dilakukan di Kebun Percobaan Pakuwon, pada<br />ketinggian tempat 450 m dpl, jenis tanah Latosol, dan tipe iklim B, mulai<br />bulan Desember 2010 sampai April 2012. Tujuan penelitian adalah untuk<br />menganalisis beberapa karakter vegetatif dan generatif yang berpengaruh<br />terhadap karakter hasil tanaman kopi Arabika melalui penggunaan ALB<br />dan Model Persamaan Struktural (MPS). Metode yang digunakan adalah<br />metode observasi dengan teknik penentuan pohon contoh secara sistematis<br />sebanyak 40 tanaman kopi Arabika varietas Kartika 1 dan Kartika 2. Hasil<br />penelitian menunjukkan bahwa jumlah buah pada populasi kopi Arabika<br />varietas Kartika 1 dan 2 di KP Pakuwon dipengaruhi secara langsung oleh<br />karakter generatif dan secara tidak langsung oleh karakter vegetatif. Pada<br />fase vegetatif, karakter tinggi tanaman dan diameter batang dapat<br />digunakan sebagai kriteria seleksi positif untuk produksi tinggi,<br />sedangkan karakter lebar tajuk dapat digunakan sebagai kriteria seleksi<br />negatif. Pada fase generatif, karakter jumlah cabang produktif serta jumlah<br />klaster buah dan bunga dapat digunakan sebagai kriteria seleksi positif.<br />Kata kunci: Kopi arabika, seleksi, vegetatif, generatif, hasil, analisis<br />lintasan bertahap, model persamaan struktural</p>