Main Article Content
This research was carried out to determine the effect of some pregermination treatments on the seeds of Acacia auriculiformis as it affects growth. The treatments involve the effect of sulphuric acid (concentration and time), mechanical scarification (at different sides), and hot water treatment (volume and time). Split plot design was used for acid treatment and hot water treatment, while Randomized Complete Block Design (RCBD) was used for mechanical scarification. The experiment was carried out at Federal University of Agriculture, Abeokuta, Nigeria. Parameters assessed include; plant height, stem height, leaf number. Acid treatment was carried out using different concentration of sulphuric acid (98%, 50% and 20%) and different treatment time (2 minutes, 5 minutes and 10 minutes). Concentration of acid was significant (p<0.05) on plant height, stem height and leaf number, higher concentration of acid (98%) enhanced morphological parameters of Acacia auriculiformis. Result showed that mechanical scarification significantly affect stem height (p<0.05), however, while mechanical scarification does not significantly affect plant height, the highest mean plant height (8.98 cm) was observed in seeds that were mechanically scarified at the micropyle; early germination of seeds was also noticed. Hot water treatment was carried out using different volume of water (50 cl and 1 litre) and varying treatment time (2 minutes, 4 minutes, 6 minutes and 10 minutes), the treatment showed no significant difference, and this method is not favourable for breaking seed dormancy of Acacia auriculiformis. Result showed that 100% germination could be achieved within seven (7) days when seeds are mechanically scarified at the micropyle, circumference, distal-end and micropyle+distalend, provided the seeds are viable. This research conclude that, acid scarification using H2SO4 at 98% concentration is the best method yielding better morphological parameters in Acacia auriculiformis, followed by mechanical scarification (especially when scarified at the micropyle).
Simons AJ, Leakey RB. Tree domestication in tropical agroforestry. Agrofor. Syst. 2004; 61:167-181.
Hossain MK, Islam SA, Zashimuddin M, Tarafdar MA, Islam QN. Growth and biomass production of some Acacia and Eucalyptus species in degraded Sal forest areas in Bangladesh. Indian Forester. 1997;23(3):211-217.
Pinyopusarerk K. Acacia auriculiformis: An Annotated Bibliography. Winrock Int. Inst. Agricultural Development, Austral. Centre Int. Agricultural Research, Canberra; 1990.
F.A.O. Seed sources establishment and tree improvement project, Sabah, Malaysia. In: Pedley, L. (ed.) Variation in Acacia mangium Willd. Food and Agriculture Organization, Rome; FAO/ UNDP-MAL/78/009 consultants’ report. 1982;8:41-42.
Le DK, Nguyen DH, Nguyen VT. Natural hybrid between Acacia mangium and Acacia auriculiformis (in Vietnamese). Forest Journal. 1993;7:18-19.
Kha LD. Studies on the use of natural hybrids between Acacia mangium and Acacia auriculiformis, Vietnam. Agricultural Publishing House, Hanoi, Vietnam; 2001.
Danthu A, Roussel J, Saar JA. Effect of different pretreatments on the germination of Acacia senegal seeds. Seed Sci. Technol. 1992;20(1):111−117.
Teketay D. Germination of Acacia origena, A. pilispina and Pterolobium stellatum in response to different presowing seed treatments, temperature and light. J. Arid Environ. 1998;38(4):551-560.
Aref IM. Effects of pre-germination treatments and sowing depths upon germination potential of some Acacia species. Res. Bull. 2000;95:5-17.
Rodrigues DC, Kohl MC, Pedrinho DR, Arias ER, Favero S. Treatments to overcome dormancy of Acacia mangium seeds. Acta. Sci. Agron. (UEM). 2008;30: 279-283.
Baskin JM, Baskin CC. A classification system for seed dormancy. Seed Science and Research. 2004;14:1-16.
Maguire JD. Speed of germination-aid in selection and evaluation for seedling emergence and vigor. Crop Sci. 1962;2: 176-177.
Alvarado AD, Bradford KJ, Hewitt JD. Osmotic priming of tomato seeds. Effects on germination, field emergence, seedling growth and fruit yield. Journal of American Society of Horticultural Science. 1987;112: 427-432.
Ruan, S, Xue Q, Tylkowska K. The influence of priming on germination of rice (Oryza sativa L.) seeds and seedling emergence and performance in flooded soil. Seed Science & Technology, 2002; 30:61-67.
Osman K, Sadik C, Veli O, Bilal A. Influence of seed coat treatments on germination and early seedling growth of Lupinus varius L. Pak. J. Bot. 2004; 36(1):65-74.
Baskin JM, Xiaoying N, Baskin CC. A comparative study of seed dormancy and germination in an annual and a perennial species of Senna (Fabaceae). Seed Science Research. 1998;8:501-512.
Owonubi JJ, Otegbeye GO, Nwokedi C. Development of pregermination technique for Azadirachta indica: Preliminary investigation. Sustainable Forest Management in Nigeria: Lessons and Prospects. Proceedings of the 30th Annual Conference of the Forestry Association of Nigeria, Kaduna, Kaduna State. 2005;29-38.
Yisau JA, Aduradola AM, Agboola DA, Jayeola OA. Influence of pre-germination treatments on germination potentials and seedling vigour of Albizia zygia (D.C. Macbr.) J. Appl. Sci. Environ. Manage. 2015;19(3):39-400.
Okunlola AI, Adebayo RA, Orimogunje AD. Methods of braking seed dormancy on germination and early seedling growth of African locust bean (Parkia biglobosa) (JACQ.) Benth. Journal of Horticulture and Forestry. 2011;3(1):1-6.
Amoakoh OA, Nortey DD, Sagoe DF, Amoako PK, Jallah CK. Effects of pre-sowing treatments on the germination and early growth performance of Pouteria campachiana. Forest Science and Technology. 2017;13(2):83-86.
Tomlinson H, Ng’andwe M, Nikiema A. Field and in vitro methods of propagation of the African locust bean tree (Parkia biglobosa (Jacq)(Benth.). J. Hortic. Sci. Biotechnol. 2000;75:42-49.