Propagation for maximum production of planting material and water use studies for giant bamboo dendrocalamus giganteus
Author: Mutune, Adelaide Ndunge
Awarding University: Jomo Kenyatta University of Agriculture and Technology, Kenya
Level : MSc
Holding Libraries: Jomo Kenyatta University of Agriculture and Technology Library ;
Advisors: Catherine Wangari Muthuri/Victoria Wambui NgumiAbstract:
Giant bamboo (Dendrocalamus giganteus) is one of the fastest growing bamboo species in the world and is being popularised to supplement the growing demand for wood products in Kenya. The species, however, roots poorly under vegetative propagation because and cuttings die excessively after sprouting mainly attributed to fungal infestation. This study was aimed at improving the rooting and survival percentages of D. giganteus cuttings. Moreover, provision of pathogen-free planting material through in vitro propagation was explored. Exotic to Kenya, 0: giganteus water usage and adaptability must be established hence the water experiments in the study.To promote rooting, auxins (Naphthalene acetic acid (NAA) and Indolebutyric acid (lSA) at concentrations of 20, 80, 140 and 200 mgr1 each) were applied. Auxin application significantly promoted rooting (p<0.01) with NAA performing better than ISA. NAA 200 mgr1 had the highest rooting (55%) while the controls had only 2.5%. Isolation of fungi from D. giganteus dying shoots and cuttings yielded Fusarium genus which was sensitive to Ridomil? 80% and 90% and CuOCI 20% and 70%. The effectiveness of these fungicides was significantly (p<0.05) reduced by dampness hence the conclusion that dampness is important in D. giganteus propagation. In vitro propagation of D. giganteus was in full Murashige and Skoog (MS, 1962) supplemented with a wide range of hormones, 25 0 C and 16 h photoperiod. NAA 5.2 JM + SAP 8.8 JM had a significantly high shoot production (50%) and the fastest growing shoots while NAA 41.6 JM + SAP 8.8 JM had a significantly (p<0.05) high mean shoot number (3). Soil moisture of 0.15 to 0.4 cm3cm-3 (water/soil) on D. giganteus established seedlings had a significant (p<0.05) effect on assimilation and transpiration rates, growth rates and dry matter contents but not on Water Use Efficiency (highest WUE value was 11 JMm-2s- The higher soil moisture contents had higher values. These preliminary results show that D. giganteus seedlings can withstand low moisture conditions without excessively reducing the processes. These results give a strong background for expanding D. giganteus in Kenya because a reasonable success rate is attainable and its water demand satiable in many regions, of Kenya.