Variasi Fenotipe Polong dan Biji Malapari (Pongamia pinnata Linn)
DOI:
https://doi.org/10.59465/jpht.v19i2.794Kata Kunci:
Provenan, Pongamia pinnata, Domestikasi, Polong, BijiAbstrak
Malapari merupakan tanaman serbaguna yang dimanfaatkan terutama untuk biofuel dan obat. Upaya untuk memperoleh sumber daya genetik malapari dengan produktivitas tinggi menjadi tantangan pemuliaan malapari. Studi ini bertujuan untuk menganalisis karakter morfologi polong dan biji yang dihasilkan dari plot uji provenan malapari di KHDTK Parungpanjang dengan menghitung: (a) data keragaman provenan berdasarkan fenotipe polong dan biji, (b) korelasi antara karakter fenotipe polong dan biji; dan (c) pengaruh genetik terhadap fenotipe polong dan biji. Sebanyak 200 polong dikoleksi dari empat provenan (Alas Purwo, Bangka, Batu Karas dan Carita). Karakter polong dan biji yang diukur meliputi panjang, lebar, tebal, berat dan rasio lebar tebal. Korelasi antar karakter dihitung berdasarkan korelasi Pearson. Estimasi genetik dianalisis melalui penghitungan koefisien varian genotipe. Pola keragaman antar provenan diketahui dengan menggunakan metode analisis komponen utama (PCA) dan analisis klaster. Hasil studi menunjukkan seluruh karakter fenotipe polong dan biji malapari berbeda nyata antar provenan, kecuali pada rasio antara lebar dan tebal polong. Provenan Bangka merupakan provenan dengan karakter fenotipe polong dan biji terbaik. Korelasi hanya terjadi antar karakter polong dengan karakter polong lainnya dan antar karakter biji dengan karakter biji lainnya, sehingga tidak dapat untuk menduga satu sama lain. Sebagian besar karakter polong dan biji lebih dipengaruhi faktor genetik dibanding lingkungan yang ditunjukkan dengan nilai keragaman genetik yang lebih tinggi. Berdasarkan karakteristik polong dan biji dari empat provenan yang diuji, terdapat tiga kelompok, yaitu provenan Alas Purwo, kelompok dari gabungan provenan Batu Karas dan Carita serta provenan Bangka.
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