
	International Journal of Agricultural Research
	Year: 2008 \| Volume: 3 \| Issue: 4 \| Page No.: 287-295 DOI: 10.3923/ijar.2008.287.295

Water Stress Induces Cultivar Dependent Changes in Stomatal Complex, Yield and Osmotic Adjustments in Glycine max L.

F.B. Adejare and C.E. Umebese

Abstract: Glycine max (L.) Merril. cultivars TGX 536-02D cv. A) and TGX 923-2E (cv. B) were subjected to water stress for 7 days at the vegetative stage (T₂), flowering/fruiting stage (T₃), seed development stage (T₄) and the control (T₁) with water potential (ψ_w) values of about -1.5, -2.3, -2.7 and -0.3 MPa, respectively. Stressed T₃ and T₄ plants of both cultivars had very low tolerance (20-46%). Trichomes were present in the abaxial epidermis of T₃ and T₄ plants with higher occurrence in cv.B and stomata were sunken. Generally, abaxial and adaxial stomatal aperture of stressed cultivars decreased in the order T₂>T₃>T₄ stages and there was a corresponding increase in stomatal index in stressed plants. The low tolerance of T₃ and T₄ plants coupled with significant reduction in stomatal aperture with increase in stomatal index may have caused the drastic reduction in number of pods and seed yield of these stressed plants. While yield of T₂ plants of cv. B was also significantly reduced (p<0.05), 100 seed weight of cv. A was significantly enhanced. Both cultivars are capable of osmotic adjustments as shown by the accumulation of sugars and the reduction of lipids and starch in seeds of stressed plants with greater accumulation of sugar in cv. B. Hence the reproductive stage is critical in the growth of both cultivars but cv. B shows greater osmotic and structural adjustments than cv. A.

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How to cite this article:

F.B. Adejare and C.E. Umebese, 2008. Water Stress Induces Cultivar Dependent Changes in Stomatal Complex, Yield and Osmotic Adjustments in Glycine max L.. International Journal of Agricultural Research, 3: 287-295.

DOI: 10.3923/ijar.2008.287.295

URL: https://scialert.net/abstract/?doi=ijar.2008.287.295

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