Albert A. PiñonUniversity of the Philippines Los Baños, Philippines
Title: Influence of Leaf Number, Rooting Trait, and Cutting Size in Vegetative Propagation of Aquilaria cumingiana [Decne] Ridl.
A low-cost technique of propagation study to determine the influence of leaf number and relationship among rooting trait and cutting size was carried out on cuttings from seedlings of Aquilaria cumingiana. The highest percentage of rooting was detected in cuttings with two leaves (83.62%) and lowest in cuttings with the greatest (3) number of leaves (50%). Comparison of the means revealed a significant increase in percent rooting, number of roots, and length of the longest root on cuttings with two leaves. Correlation analysis among root traits revealed significant (P < 0.0001) low to high positive relationships (r2 = 0.26–0.91). The strongest association was recorded between the average root length and the length of the longest root (r2 = 0.91, P < 0.0001). All relationships between the rooting trait and the cutting size displayed weak and non-significant (r2 = 0.04–0.17, P > 0.05) – suggesting that aside from amount, variation in distribution and transport of naturally occurring endogenous auxin might probably affect the rooting. This study generated an economical and practical protocol to vegetatively massproduce this premium species. Further studies are recommended, particularly with regards to auxin quantification to identify and quantify the specific naturally occurring endogenous auxin that is affecting the rooting of A. cumingiana
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