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Sudan Journal of Agricultural Research

Effect of imposing moisture and nitrogen stresses and subsequent correction on two wheat cultivars

 A.A.Hussein

Abstract:

 Two cultivars of wheat "Nandu" a genotype from Germany and"Dagdas”from the Mediterranean environment were subjected to drought and N stress then tested for their response to re-watering and nitrogen supply. Effects of these treatments on plant growth (shoot and root dry weights and leaf elongation rate) and rate of photosynthesis and transpiration were studied. Drought significantly decreased these parameters, but Dagdas was less affected. Observations through the Plexiglas window indicated that resumption of growth of the dormant root laterals as well as the new growth following re-watering with or without had nitrogen a slightly better effect with N addition. The results suggest that water was the limiting factor for root growth under spot irrigation. Well-watered Nandu had high potential for photosynthesis rate (Pn), but showed more reduction than Dagdas under stress conditions. The low transpiration rate for Nandu under stress and rapid recovery after re-watering, strengthened the possibility of stomata regulation rather than mesophyll problems .The chlorophyll content values corresponded with the trend of Pn, indicating that the former would be inconvenient method for estimating Pn.

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Sudan Journal of Agricultural Research Vol. 4(2004) PP. 53-64