Clonal Propagation and Clonal Trial of Hybrid Acacia

摘要

Naturally crossed hybrids of Acacia mangium x Acacia auriculiformis are found in the A. auriculiformis and A. mangium plantations of Bangladesh, During 1995 superior hybrid Acacia trees were selected and propagated by using shoot cuttings for establishing a hedge orchard Coppice shoots sprouted from this hedge orchard plants were used as stem cuttings for rooting trials, and successful cuttings from different clones provided planting materials for clonal trial experiments. There were highly significant differences between cuttings taken from different zones of the shoot (cutting types) and hormone treatments in the number of successful cuttings and number of roots produced per rooted cuttings. Tip cuttings (2 noded) rooted 71.5% and produced 3.7 roots per rooted cutting when treated with 500 ppm IBA. Similarly, 3rd node cutting also rooted 80.0% and produced 4.1 roots per rooted cutting under the same treatment A slight decrease in rooting success (55.5%) and number of roots (3.2) per rooted cutting were recorded in 4th node cuttings under the same treatment But percentage of rooting success and number of roots per rooted cuttings were not increased in the above mentioned three types of cuttings when treated with higher concentration (1000 ppm or1500 ppm) of IBA When a higher concentration of IBA (1000 ppm) was used in treating 5~(th) node cutting better (50.0%) rooting success and number of roots (33) per rooted cutting were observed. In respect to rooting success and number of roots produced per rooted cutting the variation between the cuttings of different zone of the shoot (cutting type) and hormone treatment was highly significant. There were significant differences between clones in height growth. The highest and lowest height growth wererecorded in clone 2 (87.21cm) and in clone 13 (38.5cm) respectively.