The Dragon tree, Dracaena draco (L.) L., is an extremely threatened species. Its natural regeneration is disturbed and population appears to decrease rapidly. To design appropriate germination and seedling establishment protocols for a species conservation and restoration program, we studied the effects of pre-soaking, substrate and light availability treatment on seed germination for 15-day period. The condition for light availability corresponded to the sowing depth (at surface or at 2 cm depth). Germination occurred better in the dark when seeds were sown at 2 cm depth. Our results showed that D. draco seeds sown in the sand under dark condition and after 24 hours pre-soaking in warm water germinated better and recorded 82.5% of final germination percentage (FGP). However, seedlings grew better in potting soil and recorded 54 mm of length. The maximum FGP of 51.3% was recorded under light condition. These results indicate that sowing depth and light availability could be a limiting factor for D. draco seed germination in natural condition. Furthermore, the establishment of D. draco seedlings (shoot and root length) during an 8-week period in pots was also assessed and illustrated. More research on seed ecophysiology is required to understand the mechanisms controlling seed germination of D. draco in arid and semi-arid conditions viz. salinity and drought.
Ali, A. S., & Elozeiri, A. A. (n.d.). Metabolic Processes During Seed Germination. In Advances in Seed Biology. https://doi.org/10.5772/intechopen.70653
Anonymous. (2020). Dragon Tree (Dracaena draco.
Ashmore, S. E., Hamilton, K. N., & Offord, C. A. (2011). Conservation technologies for safeguarding and restoring threatened flora: case studies from Eastern Australia. In Vitro Cellular & Developmental Biology - Plant, 47(1), 99–109. https://doi.org/10.1007/s11627-010-9320-9
Bell, D. T. (1999). The Process of Germination in Australian Species. Australian Journal of Botany, 47(4), 475–517. https://doi.org/10.1071/BT98007
Bewley, J. D., & Black, M. (2012). Physiology and biochemistry of seeds in relation to germination. In viability, dormancy, and environmental control (Vol. 2, p. 375).
Bruck, M. (1999). Dragon’s blood. A glance into the history of pharmacognosy. Bull Soc Sci Med, 1, 96–101.
Burmeier, S., Donath, T. W., Otte, A., & Eckstein, R. L. (2010). Rapid burial has differential effects on germination and emergence of small- and large-seeded herbaceous plant species. Seed Science Research, 20(3), 189–200. https://doi.org/10.1017/S0960258510000127
Cochrane, J. A., Crawford, A. D., & Monks, L. T. (2007). The significance of ex situ seed conservation to reintroduction of threatened plants. Australian Journal of Botany, 55(3), 356–361. https://doi.org/10.1071/BT06173
Comparative effect of NaCl and CaCl2 on seed germination of Acacia saligna L. and Acacia decurrens Willd. (2016). International Journal of Biosciences (IJB), 8(6), 1–13. https://doi.org/10.12692/ijb/8.6.1-13
del Arco Aguilar, M. J., & Rodríguez Delgado, O. (2018). Changes in the Natural Landscape Through Human Influence. In Plant and Vegetation (pp. 321–336). https://doi.org/10.1007/978-3-319-77255-4_7
Fenner, M. (1991). The effects of the parent environment on seed germinability. Seed Science Research, 1(2), 75–84. https://doi.org/10.1017/S0960258500000696
Forcella, F., Benech Arnold, R. L., Sanchez, R., & Ghersa, C. M. (2000). Modeling seedling emergence. Field Crops Research, 67(2), 123–139. https://doi.org/10.1016/S0378-4290(00)00088-5
Gallardo, K., Thompson, R., & Burstin, J. (n.d.). Reserve accumulation in legume seeds. Comptes Rendus. Biologies, 331(10), 755–762. https://doi.org/10.1016/j.crvi.2008.07.017
Gideon, S. (2013). Succulent Paradise - Twelve great gardens of the world (p. 184).
Godefroid, S., Van de Vyver, A., & Vanderborght, T. (2010). Germination capacity and viability of threatened species collections in seed banks. Biodiversity and Conservation, 19(5), 1365–1383. https://doi.org/10.1007/s10531-009-9767-3
Harper, J. L., Lovell, P. H., & Moore, K. G. (1970). The Shapes and Sizes of Seeds. Annual Review of Ecology and Systematics, 1(1), 327–356. https://doi.org/10.1146/annurev.es.01.110170.001551
HEGARTY, T. W. (1978). The physiology of seed hydration and dehydration, and the relation between water stress and the control of germination: a review. Plant, Cell & Environment, 1(2), 101–119. https://doi.org/10.1111/j.1365-3040.1978.tb00752.x
Iralu, V., Barbhuyan, H. S. A., & Upadhaya, K. (2019). Ecology of seed germination in threatened trees: a review. Energy, Ecology and Environment, 4(4), 189–210. https://doi.org/10.1007/s40974-019-00121-w
Jupa, R., Plichta, R., Paschová, Z., Nadezhdina, N., & Gebauer, R. (2017). Mechanisms underlying the long-term survival of the monocot Dracaena marginata under drought conditions. Tree Physiology, 37(9), 1182–1197. https://doi.org/10.1093/treephys/tpx072
Kheloufi, A., Mansouri, L. M., & Vanbellinghen, C. (n.d.). Seed germination of Crataegus monogyna – a species with a stony endocarp. REFORESTA, 7, 73–80. https://doi.org/10.21750/REFOR.7.06.68
Khurana, E., & Singh, J. S. (2001). Ecology of seed and seedling growth for conservation and restoration of tropical dry forest : a review. Environmental Conservation, 28(1), 39–52. https://doi.org/10.1017/S0376892901000042
Klimko, M., Nowińska, R., Jura-Morawiec, J., Wiland-Szymańska, J., & Wilkin, P. (2018). Pollen morphology of selected species of the genera Chrysodracon and Dracaena (Asparagaceae, subfamily Nolinoideae) and its systematic implications. Plant Systematics and Evolution, 304(3), 431–443. https://doi.org/10.1007/s00606-017-1486-8
Krawczyszyn, J., & Krawczyszyn, T. (2014). Massive aerial roots affect growth and form of Dracaena draco. Trees, 28(3), 757–768. https://doi.org/10.1007/s00468-014-0987-0
Krawczyszyn, J., & Krawczyszyn, T. (2016). Photomorphogenesis in Dracaena draco. Trees, 30(3), 647–664. https://doi.org/10.1007/s00468-015-1307-z
Lengálová, K., Kalivodová, H., Habrová, H., Maděra, P., Tesfamariam, B., & Šenfeldr, M. (n.d.). First Age-Estimation Model for Dracaena ombet and Dracaena draco subsp. caboverdeana. Forests, 11(3), 264. https://doi.org/10.3390/f11030264
Limón, Á., & Peco, B. (2016). Germination and emergence of annual species and burial depth: Implications for restoration ecology. Acta Oecologica, 71, 8–13. https://doi.org/10.1016/j.actao.2016.01.001
Lu, P.-L., & Morden, C. W. (2014). Phylogenetic Relationships among Dracaenoid Genera (Asparagaceae: Nolinoideae) Inferred from Chloroplast DNA Loci. Systematic Botany, 39(1), 90–104. https://doi.org/10.1600/036364414X678035
Maděra, P., Habrová, H., Šenfeldr, M., Kholová, I., Lvončík, S., Ehrenbergerová, L., Roth, M., Nadezhdina, N., Němec, P., Rosenthal, J., & Pavliš, J. (2019). Growth dynamics of endemic Dracaena cinnabari Balf. f. of Socotra Island suggest essential elements for a conservation strategy. Biologia, 74(4), 339–349. https://doi.org/10.2478/s11756-018-0152-0
Maiti, R., Thakur, A. K., & Rodriguez, H. G. (2017). Seed priming: A potential tool to improve seedling vigour, seedling establishment and crop productivity. Applied Botany, 85.
MANSOURI, L. M., HELEILI, N., BOUKHATEM, Z. F., & KHELOUFI, A. (2019). SEED GERMINATION AND RADICLE ESTABLISHMENT RELATED TO TYPE AND LEVEL OF SALT IN COMMON BEAN (PHASEOLUS VULGARIS L. VAR. DJEDIDA). Cercetari Agronomice in Moldova, 52(3), 262–277. https://doi.org/10.46909/cerce-2019-0026
Marzol, M. V., Sánchez, J. L., & Yanes, A. (2011). Meteorological patterns and fog water collection in Morocco and the Canary Islands. Erdkunde, 65(3), 291–303. https://doi.org/10.3112/erdkunde.2011.03.06
Maun, M. A. (1994). Adaptations enhancing survival and establishment of seedlings on coastal dune systems. Vegetatio, 111(1), 59–70. https://doi.org/10.1007/BF00045577
MURALI, K. S. (1997). Patterns of Seed Size, Germination and Seed Viability of Tropical Tree Species in Southern India1. Biotropica, 29(3), 271–279. https://doi.org/10.1111/j.1744-7429.1997.tb00428.x
Nair, M. B. (2000). Sustainable utilization of gum and resin by improved tapping technique in some species. Harvesting of Non-Wood, 293.
Reichardt, K., & Timm, L. C. (2020). How Plants Absorb Nutrients from the Soil. In Soil, Plant and Atmosphere (pp. 313–330). https://doi.org/10.1007/978-3-030-19322-5_16
Ren, H., Jian, S., Liu, H., Zhang, Q., & Lu, H. (2014). Advances in the reintroduction of rare and endangered wild plant species. Science China Life Sciences, 57(6), 603–609. https://doi.org/10.1007/s11427-014-4658-6
Rifna, E. J., Ratish Ramanan, K., & Mahendran, R. (2019). Emerging technology applications for improving seed germination. Trends in Food Science & Technology, 86, 95–108. https://doi.org/10.1016/j.tifs.2019.02.029
Sanders‐DeMott, R., McNellis, R., Jabouri, M., & Templer, P. H. (2018). Snow depth, soil temperature and plant–herbivore interactions mediate plant response to climate change. Journal of Ecology, 106(4), 1508–1519. https://doi.org/10.1111/1365-2745.12912
Saux, M., Ponnaiah, M., Langlade, N., Zanchetta, C., Balliau, T., El‐Maarouf‐Bouteau, H., & Bailly, C. (2020). A multiscale approach reveals regulatory players of water stress responses in seeds during germination. Plant, Cell & Environment, 43(5), 1300–1313. https://doi.org/10.1111/pce.13731
Schneider, F. D., Morsdorf, F., Schmid, B., Petchey, O. L., Hueni, A., Schimel, D. S., & Schaepman, M. E. (n.d.). Mapping functional diversity from remotely sensed morphological and physiological forest traits. Nature Communications, 8(1). https://doi.org/10.1038/s41467-017-01530-3
Shen, S.-K., Wu, F.-Q., Yang, G.-S., Wang, Y.-H., & Sun, W.-B. (2015). Seed germination and seedling emergence in the extremely endangered species Rhododendron protistum var. giganteum—the world’s largest Rhododendron. Flora - Morphology, Distribution, Functional Ecology of Plants, 216, 65–70. https://doi.org/10.1016/j.flora.2015.08.006
Silva, B. M., Santos, R. P., Mendes, L. S., de Pinho, P. G., Valentão, P., Andrade, P. B., Pereira, J. A., & Carvalho, M. (2011). Dracaena draco L. fruit: Phytochemical and antioxidant activity assessment. Food Research International, 44(7), 2182–2189. https://doi.org/10.1016/j.foodres.2010.09.031
Valente, M. J., de Pinho, P. G., Henrique, R., Pereira, J. A., & Carvalho, M. (2012). Further insights into chemical characterization through GC–MS and evaluation for anticancer potential of Dracaena draco leaf and fruit extracts. Food and Chemical Toxicology, 50(10), 3847–3852. https://doi.org/10.1016/j.fct.2012.03.050
Wang, X.-H., Zhang, C., Yang, L.-L., & Gomes-Laranjo, J. (2011). Production of dragon’s blood in Dracaena cochinchinensis plants by inoculation of Fusarium proliferatum. Plant Science, 180(2), 292–299. https://doi.org/10.1016/j.plantsci.2010.09.007
Welbaum, G. E., Bradford, K. J., Yim, K.-O., Booth, D. T., & Oluoch, M. O. (1998). Biophysical, physiological and biochemical processes regulating seed germination. Seed Science Research, 8(2), 161–172. https://doi.org/10.1017/S0960258500004074
Woodstock, L. W. (1988). Seed imbibition: a critical period for successful germination. Journal of Seed Technology, 1–15.
(1998). Dracaena draco: Bañares, A. <i>et al.</i> [Data set]. In IUCN Red List of Threatened Species. https://doi.org/10.2305/IUCN.UK.1998.RLTS.T30394A9535771.en
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