Effects of Male Parents on Pod and Bean Components of Six Fine Cocoa Siblings

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Date
2017-03-30
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Pusat Penelitian dan Pengembangan Perkebunan
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In cacao crossing process, the genetic symptoms of direct effect of male parent as a pollen source on pod and beans performances generated from their crossing are called as the xenia effect.  The aim of this study was to investigate the effect of male parents on characters of pod and bean components generated from the crossing of several genotypes of fine cacao. The research was conducted at Kalikempit Afdeling of PTPN XII, Tulungrejo Village, Glenmore District, Banyuwangi Regency, East Java Province, at an altitude of 340 m asl, Latosol type of soil, and C type of climate, from May until December 2014. Crossing combinations were (1) DR 38 x DR 1, (2) DR 38 x DR 38, (3) DR 2 x DR 1, (4) DR 2 x DR 2, (5) DRC 16 x DR 38, and (6) DRC 16 x DRC 16.  Variables observed were the quantitative and qualitative characters of pod and bean component. The results showed that male parent DR 1 crossed with female parent DR 2 contributed in increasing fresh bean weight (34.70%), fresh bean/pod weight (44.32%), fresh single bean weight (31.00%), pod apex and base constriction shapes. Meanwhile DR 38 crossed with DRC 16 showed xenia effect on fresh bean weight (47.01%), bean (31.22%), and qualitative characters i.e. the colour of mature pod and the availability of bottle neck. All of crossing combinations produced white colour beans above 85% thus qualified as good. DR 2 and DR 38 are potential male parents to enhance the number of white bean.
Pada proses persilangan, gejala genetik berupa pengaruh langsung tetua jantan sebagai sumber tepung sari terhadap penampilan buah dan biji hasil persilangan disebut sebagai gejala xenia. Tujuan penelitian adalah mengetahui pengaruh tetua jantan terhadap karakter komponen buah dan biji hasil persilangan beberapa genotipe kakao mulia. Penelitian dilakukan di Afdeling Kalikempit  PTPN XII, Desa Tulungrejo, Kecamatan Glenmore, Kabupaten Banyuwangi, Jawa Timur, pada ketinggian tempat 340 m dpl dengan jenis tanah Latosol dan tipe iklim C, mulai bulan Mei sampai Desember 2014. Enam perlakuan kombinasi persilangan yang diuji adalah (1) DR 38 x DR 1, (2) DR 38 x DR 38, (3) DR 2 x DR 1, (4) DR 2 x DR 2, (5) DRC 16 x DR 38, dan (6) DRC 16 x DRC 16. Pengamatan dilakukan terhadap karakter kuantitatif dan kualitatif komponen buah dan biji. Hasil penelitian menunjukkan tetua jantan DR 1 yang disilangkan dengan tetua betina DR 2 berkontribusi terhadap peningkatan bobot buah segar (34,70%), bobot biji segar/buah (44,32%), dan bobot satu biji segar (31,00%), serta terhadap bentuk ujung buah dan keberadaan leher botol. Tetua jantan DR 38 yang disilangkan dengan tetua betina DRC 16 berkontribusi terhadap peningkatan bobot buah segar (47,01%) dan biji (31,22%), serta terhadap warna buah matang dan keberadaan leher botol. Seluruh kombinasi persilangan menghasilkan warna biji putih di atas 85% sehingga termasuk kualitas baik. DR 2 dan DR 38 dapat digunakan sebagai tetua jantan untuk meningkatkan jumlah biji dengan warna putih.
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