Abstract
Casuarina equisetifolia Forst. is a tree crop that provides fuel wood, land reclamation, dune stabilization, and scaffolding for construction, shelter belts, and pulp and paper production. C. equisetifolia fixes atmospheric nitrogen through a symbiotic relationship with Frankia, a soil bacterium of the actinobacteria group. The roots of C. equisetifolia produce root nodules where the bacteria fix atmospheric nitrogen, which is an essential nutrient for all plant metabolic activities. However, rooted stem cuttings of elite clones of C. equisetifolia by vegetative propagation is being planted by the farmers of Pondicherry as costeffective method. As the vegetative propagation method uses inert material (vermiculite) for rooting there is no chance for Frankia association. Therefore after planting of these stocks the farmers are applying 150 kg of di-ammonium phosphate (DAP)/acre/year. To overcome this fertilizer usage, the Frankia-inoculated rooted stem cuttings were propagated under nursery conditions and transplanted in the nutrient-deficient soils of Karaikal, Pondicherry (India), in this study. Under nursery experiments the growth and biomass of C. equisetifolia rooted stem cuttings inoculated with Frankia showed 3 times higher growth and biomass than uninoculated control. These stocks were transplanted and monitored for their growth and survival for 1 year in the nutrient-deficient farm land. The results showed that the rooted stem cuttings of C. equisetifolia significantly improved growth in height (8.8 m), stem girth (9.6 cm) and tissue nitrogen content (3.3 mg g−1) than uninoculated controls. The soil nutrient status was also improved due to inoculation of Frankia.
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The authors thank the Department of Biotechnology, New Delhi, for financial support for a research project (Project No. BT/PR10464/AGR/21/239/2008).
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[Karthikeyan A, Chandrasekaran K, Geetha M and Kalaiselvi R 2013 Growth esponse of Casuarina equisetifolia Forst. rooted stem cuttings to Frankia in nursery and field conditions. J. Biosci. 38 1–7] DOI 10.1007/s12038-013-9362-3
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Karthikeyan, A., Chandrasekaran, K., Geetha, M. et al. Growth response of Casuarina equisetifolia Forst. rooted stem cuttings to Frankia in nursery and field conditions. J Biosci 38, 741–747 (2013). https://doi.org/10.1007/s12038-013-9362-3
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DOI: https://doi.org/10.1007/s12038-013-9362-3