KERAGAMAN GENETIK, HERITABILITAS, DAN KORELASI ANTAR KARAKTER 10 GENOTIPE TERPILIH JARAK PAGAR (JATROPHA CURCAS L.)

R r. SRI HARTATI, ASEP SETIAWAN, BAMBANG HELIYANTO, SUDARSONO SUDARSONO

Abstract


ABSTRAK
Untuk menyusun program pemuliaan jarak pagar berdaya hasil
tinggi, diperlukan populasi dasar yang memiliki keragaman genetik yang
tinggi terutama pada karakter yang berkaitan dengan daya hasil tanaman.
Penelitian ini bertujuan untuk mengevaluasi keragaman genetik,
heritabilitas, dan korelasi antar karakter genotipe terpilih. Sepuluh
genotipe dievaluasi di Kebun Percobaan Balai Penelitian Tanaman
Rempah dan Aneka Tanaman Industri Pakuwon, Sukabumi mulai bulan
Agustus 2009 - Juli 2010. Rancangan lingkungan adalah acak kelompok
lengkap dengan 3 ulangan. Setiap unit percobaan terdiri atas 5 tanaman
yang ditanam dalam 1 baris dengan jarak antar baris 2 m dan jarak dalam
baris 1 m. Evaluasi dilakukan terhadap karakter vegetatif (meliputi tinggi
tanaman, lingkar batang, lebar kanopi, dan jumlah cabang total), karakter
generatif (meliputi jumlah cabang produktif, umur mulai berbunga, jumlah
tandan bunga, jumah tandan buah, fruit set), serta komponen hasil yaitu
jumlah buah per tanaman. Hasil penelitian menunjukkan 10 genotipe yang
dievaluasi memiliki keragaman genetik yang luas pada karakter generatif
umur mulai berbunga, jumlah tandan bunga, jumlah tandan buah, dan
jumlah buah per tanaman dengan nilai koefisien keragaman genetik
(KKG) berturut-turut 21,89; 29,77; 32,08; dan 33,75. Karakter-karakter ini
memiliki ragam genetik luas dan heritabilitas dalam arti luas yang tinggi
sehingga dapat dimanfaatkan sebagai kriteria seleksi. Karakter vegetatif
jumlah cabang total memiliki keragaman genetik agak luas, heritabilitas
tinggi, dan berkorelasi positif dengan jumlah tandan bunga, jumlah tandan
buah, dan jumlah buah per tanaman sehingga dapat dipertimbangkan
sebagai kriteria seleksi.
Kata kunci : Jatropha curcas, keragaman fenotipik, koefisien keragaman,
ragam genetik, kriteria seleksi

ABSTRACT
Genetic variability, heritability, and correlation among
characters of 10 selected genotypes of physic nut
(Jatropha curcas L.)
To arrange breeding programme of jatropha high yielding varieties,
it is required population base having high genetic variabilities, especially
in yield components. The objectives of this research were to evaluate
genetic variability, heritability estimate, and analyze correlation among
characters of 10 physic nut genotypes. Ten Jatropha curcas genotypes
were evaluated at Pakuwon Experimental Station of Indonesian Spice and
Industrial Crops Research Institute, Sukabumi, from August 2009 - July
2010. A randomized complete block design with 3 replicates was applied
in this experiment. Each experimental unit consisted of five plants grown
in a row with 2 m spacing in line and 1 m in row. The observations were
made for vegetative characters (plant height, stem girth, canopy width, and
number of total branches per plant), generative characters (days to
flowering, number of productive branches, inflorescences, fruit bunches
per plant, and fruit set percentages), and yield component : number of fruit
per plant. Results of the experiments indicated that the evaluated
genotypes had wide genetic variability on several generative characters i.e.
days to flowering, number of inflorescences, number of fruit bunches, and
number of fruits per plant with genotypic variability coefficient (GVC)
values of 21.89; 29.77; 32.08; and 33.75, respectively. Their genetic
variabilities were broad and high heritability. The total number of branches
as a vegetative character was fairly wide in genetic diversity, high
heritability, and positively correlated with number of inflorescences,
bunches, and fruits per plant. These characters can be considered as
selection criteria.
Key words : Jatropha curcas L., phenotypic variability, coefficient of
variation, genetic variability, selection criterion


Full Text:

PDF


DOI: http://dx.doi.org/10.21082/jlittri.v18n2.2012.74-80

Refbacks

  • There are currently no refbacks.




Copyright (c)


Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.




P-ISSN: 0853-8212
E-ISSN: 2528-6870

Pusat Penelitian dan Pengembangan Perkebunan

(Indonesian Center for Estate Crops Research and Development)

Jln. Tentara Pelajar No 1, Kampus Penelitian Cimanggu

Bogor 16111 Indonesia

Phone: +62251-8313083

Fax: +62251-8336194

Email: littri_puslitbangbun@yahoo.co.id



View My Stats