Clonal palms that were derived from callus cultures were repeatedly exposed to gamma rays of 5Gy (Grays) for three and five times during subculture intervals. Field observations and data recording were conducted four years after field planting. Preliminary results from palms derived from the callus cultures periodically irradiated for five times during subculture intervals recorded highly significant differences in leaf area index (LAI) and biomass compared with the control and standard cross palms. A two-dimensional principle component analysis score plot showed a distinct cluster of the various irradiation exposures compared to the standard cross materials. In addition, from the score and loading plots, a higher dosage of gamma irradiation resulted in increased rachis length, LAI, trunk height, biomass and leaf chlorophyll (SPAD) content, with an inversely smaller value in leaf water potential.

Klon sawit dihasil melalui kultur kalus yang terdedah kepada sinar gamma 5Gy (Grays) berturutan selama tiga dan lima kali subkultur. Pemerhatian di ladang dan penghasilan data telah dijalankan selepas tahun keempat penanaman. Keputusan awal mendapati radiasi berkala sebanyak lima kali subkultur mencatatkan perbezaan yang amat ketara dalam indeks helaian daun (LAI) dan biojisim berbanding dengan sawit kawalan dan standard. Skor analisis komponen dalam plot prinsip dua dimensi menunjukkan satu kelompok yang berbeza daripada pelbagai pendedahan penyinaran berbanding dengan sawit standard. Di samping itu, dari pemarkahan dan plot muatan, gamma penyinaran dengan dos yang lebih tinggi menghasilkan peningkatan panjang rakis,LAI, ketinggian pokok, biojisim dan kandungan klorofil daun (SPAD), berbanding dengan nilai potensi air daun yang rendah.