Scalp Induction Rate Responses to Cytokinins on Proliferating Shoot-Tips of Banana Cultivars (Musa spp.)
Siamak Shirani, Meon Sariah, Wahab Zakaria and Mahmood Maziah
DOI : 10.3844/ajabssp.2010.128.134
American Journal of Agricultural and Biological Sciences
Volume 5, Issue 2
Problem statement: The effect of cytokinins on scalp induction from in vitro propagating shoot tips of different banana (Musa spp. AAA and AAB) cultivars was studied. Approach: Proliferation rate increased with an increasing concentration of Benzyl Amino Purine (BAP) up to 22.2 ÂµM while, lower level of BAP (11.1 ÂµM) increased scalp induction. Results: Kinetin induced a lower number of shoots than that obtained with similar levels of BAP and caused an increase in scalp induction rate at higher concentration (22.2 ÂµM). Shoot proliferation in â€˜Rastaliâ€™ (AAB), â€˜Berangan Intanâ€™ and â€˜Beranganâ€™ (AAA) significantly increased with increasing Thidiazuron (TDZ) concentration from 3.17, 2.17 and 3.33 shoots at 0.5 ÂµM to 14.17, 6.22 and 6.17 shoots at 5 ÂµM respectively, as concentrations above 5 ÂµM for all cultivars were inhibitor. Conclusion/Recommendations: The highest ratio of scalp formation (8.89) was recorded in â€˜Rastaliâ€™ at the highest concentration of TDZ (7.5 ÂµM), but in â€˜Berangan Intanâ€™ and â€˜Beranganâ€™ (AAA) TDZ increased scalp induction rate from 0.00 and 0.43 at 0.5 ÂµM to 4.22 and 2.67 at 5 ÂµM respectively before falling to 2.11 for both at 7.5 ÂµM. BAP at 22.2 ÂµM was considered optimal for shoot proliferation as well as shoot elongation from excised scalps of banana cultivars.
© 2010 Siamak Shirani, Meon Sariah, Wahab Zakaria and Mahmood Maziah. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.