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Journal of Applied Sciences and Environmental Management
World Bank assisted National Agricultural Research Project (NARP) - University of Port Harcourt
ISSN: 1119-8362
Vol. 23, No. 12, 2019, pp. 2221-2229
Bioline Code: ja19331
Full paper language: English
Document type: Research Article
Document available free of charge

Journal of Applied Sciences and Environmental Management, Vol. 23, No. 12, 2019, pp. 2221-2229

 en Effects of Water Deficit on Growth, Biomass Allocation and Photosynthesis of A. senegal check for this species in other resources Seedlings from Nguru and Gujba Provinces of Yobe State, North Eastern Nigeria


Acacia senegal (L) Willd is a multipurpose tree species that occurs throughout semi-arid Africa. Poor yields of gum from the species in the semi-arid region of Nigeria may be due to more frequent drought events. It is not yet clear whether some populations of A. senegal may respond differently to any encroaching drought. The effects of water deficit on growth, biomass allocation and photosynthesis of A. senegal seedlings from Nguru and Gujba province of Yobe state, North Eastern Nigeria were studied under glasshouse conditions for 120 days. Plants were subjected to three watering regimes; control (well-watered) conditions corresponding to 25% gravimetric water content (GWC), mild water deficit at 15% (GWC) and severe-water-deficit at 10% (GWC), respectively. There was a highly significant difference in stomata conductance among the treatments (F2, 84=11.38, P< 0.001) in relation to water deficit. There was no statistical difference in quantum yield between the two provenances (F1, 84 =0.15, P=0.695) and interaction between treatment and provenances was also not significant (F2, 84= 2.14, P=0.124). mean root length between the provenances were significantly different (F2,84 =0.60, P< 0.001) however Root length was not statistically significantbetweentreatments (F2,84= 0.60, P= 0.550). Plant biomass, stomata conductance, quantum yield, chlorophyll fluorescence, relative water content, root length and root: shoot ratios were highly responsive to changes in soil water. It was concluded that A. senegal is capable of physiological adjustment in response to soil moisture as a form of ecological adaptation.

biomass allocation; provenances; relative water content; stomata conductance.

© Copyright 2019 - Jibo and Barker

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