Heartrot of Acacia mangium: Genetic variations in the second generartion progeny tests at age of 8-9 years
Keywords:
Acacia mangium, 2nd generation test, ArborSonic 3D, heartrot, wood properties,, heritability, GxE interactionAbstract
Study on genetic variation in heartrot percentage and disease index was carried out by using ArborSonic 3D machine in 3 second generation progeny tests in Ba Vi - Ha Noi, Quy Hop - Nghe An and Bau Bang - Binh Duong, at age of 8 -9 years; The correlation of heartrot percentages evaluated between ArborSonic 3D equipment and Caroline method (2006) were close (r = 0,77) respectively. In consequence, ArborSonic 3D can be used to quickly identify heartrot disease with high confidence. Predicting the genetic parameters for the 3 progeny tests indicated narrow-sense heritabilities of heartrot percentage and heartrot index were low, ranging from 0.14 to 0.23, but coefficients of additive
genetic variation (CV a) of them were high, from 10.8 to 24.5%. The substantial coefficients of additive genetic variation and significant heritabilities for heartrot percentage and heartrot index indicate that considerable potential for improvement in heartrot percentage and heartrot index through selecting among superior individuals within families of A. mangium. Genetic correlation (Rg) between heartrot index and density, and shrinkage ratios in both tangential and radial directions were negative and significantly different from zero (ranged from -0.47 to -0.75). Heartrot index also correlated positively and weakly with dynamic modulus of elasticity (Rg=0.21-0.37). In contrast, heartrot index positively and strongly correlated with wood strength (Rg=0.51-0.64). The site-site genetic correlations between Ba Vi, Quy Hop and Bau Bang were low for growth traits and heartrot index indicating that G x E effects are of practical importance for growth and heartrot index and different deployment populations will be required for different sites.
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