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2015 | 37 |
Tytuł artykułu

Shea (Vitellaria paradoxa C.F. Gaertn.) seedlings showed impressive recovery after defoliation

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Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Experiments to determine the effect of seed size, watering interval and defoliation on growth and dry matter attributes of seedlings of shea butter tree were conducted at Makurdi, Nigeria, from July 2010 to April, 2012. In the first experiment, treatments were made up of three seed size categories described as small (5-10g), medium (11-15g) and large (16-20g) and three watering intervals of 3, 6 and 9 days. In the second experiment, treatments comprised three watering intervals of 3, 6 and 9 days and three levels of defoliation – 0, 50 and 100%. In both experiments, factorial combinations of the treatments were laid out in completely randomized design (CRD) and replicated three times. Results of analysis of variance showed that in the first experiment seed size significantly influenced root length with the medium and large seeds producing seedlings with comparatively longer roots than the small seeds. The most frequently watered seedlings (3 and 6 days) produced more leaves than those watered less frequently (9 days). Seed size influenced dry weight of root and total (whole plant) dry weight with the medium and large seeds recording significantly higher values than the small seeds. Watering interval however did not significantly influence any of the other traits. Seed weight exerted significant influence on amount of dry matter partitioned to the stem and the root. More dry matter was partitioned to the stem by the small seeds. Conversely, medium and large seeds allocated more dry matter to the root than to the stem. In the second experiment, defoliation level only influenced total fresh weight, dry weight of root and total dry weight in favour of plants with half their leaves removed. None of the traits examined were significantly influenced by watering regime. Interaction between defoliation level and watering regime significantly influenced total fresh weight, dry weight of root and total dry weight. Generally seed size had more influence on seedling characters than watering interval. Seedlings also demonstrated remarkable ability to overcome effects of defoliation.
Słowa kluczowe
Wydawca
-
Rocznik
Tom
37
Opis fizyczny
p.61-70,ref.
Twórcy
autor
  • Department of Crop Production, University of Agriculture, P M B 2373, Makurdi, Nigeria
  • Department of Crop Production, University of Agriculture, P M B 2373, Makurdi, Nigeria
autor
  • Department of Crop Production, University of Agriculture, P M B 2373, Makurdi, Nigeria
Bibliografia
  • [1] Coomes, D. A. and Grubb, P. J. 2003. Colonization, tolerance, competition and seed size variation within functional groups. Trends in Ecology and Evolution 18: 283-291
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  • [9] Ker, A. 1999. Farming Systems of the African Savanna: A Continent in Crisis. IDRC, 176pp
  • [10] Khurana, E. and Singh, J. S. 2000. Influence of seed size on seedling growth of Albizia procera under different soil water levels. Annals of Botany 86: 1185-1192.
  • [11] Leishman, M. R. and Westoby, M. 1994. The role of seed size in seedling establishment in dry soil conditions – experimental evidence from semiarid species. Journal of Ecology 82: 249-258
  • [12] Okigbo, B. N. 1985. Land use and production potentials of African savanna. In
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  • [16] Sack, L., Grubb, P. J. and Marańón, T. 2003. The functional morphology of juvenile plants tolerant of strong summer drought in shaded forest understories in southern Spain. Plant Ecology 168: 139-163.
  • [17] Sánchez-Gómez, D., Valladares, S. and Zavala, M. S. 2006. Performance of seedlings of Mediterranean woody species under experimental gradients of irradiance and water
  • [18] availability: trade-offs and evidence for niche differentiation. New Phtologist 170:795-806.
  • [19] Seiwa, K. and Kikuzawa, K. 1991. Phenology of tree seedlings in relation to seed size. Canadian Journal of Botany 69: 532-538
  • [20] Ugese, F. D., Ahen, A. and Ishar, S. I. 2011b. Single defoliation had little influence on growth and dry matter attributes of shea (Vitellaria paradoxa Gaertn F.) seedlings. Forests, Trees and Livelihoods 20: 283-294.
  • [21] Ugese, F. D., Baiyeri, K. P. and Mbah, B. N. 2008a. Leaf area determination of shea butter tree (Vitellaria Paradoxa C. F. Gaertn.). Int. Agrophysics, 22: 167-170.
  • [22] Ugese, F. D., Baiyeri, K. P. and Mbah, B. N. 2008b. Effect of seed origin and watering regime on seedling growth and dry matter yield of shea butter tree (Vitellaria paradoxa Gaertn F.) seedlings. Bioresearch 6: 303 – 307.
  • [23] Ugese, F. D., Baiyeri, K. P. and Mbah, B. N. 2010. Determination of growth stages and seedling structures associated with slow emergence of shea butter tree (Vitellaria paradoxa C. F.Gaertn.) seedlings. Journal of Animal and Plant Sciences 8: 993-998
  • [24] Ugese, F. D., Baiyeri, K. P. and Mbah, B. N.2011a. Variability in seedling growth of seeds of shea butter tree (Vitellaria paradoxa C. F. Gaertn.) sourced from nine locations in
  • [25] Nigeria. Tree and Forestry Science and Biotechnology 5(Special
  • [26] Ugese, F. D., Ojo A. A. and Adedzwa, D. K. 2007. Effect of sowing depth and seed size on emergence and seedling growth of seeds of shea butter tree (Vitellaria paradoxa). Nigerian Journal of Botany 20:93-102
  • [27] Zainudin, S. R., Awang, K. and Hanif, A. H. M. 2003. Effects of combined nutrient and water stress on the growth of Hopea odorata Roxb. and Mimusops elengi Linn. seedlings. Journal of Arboriculture 29: 79-83
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