Abstract
This work aimed to study the effect of reduced matric- and osmotic water potential on changes of some parameters affecting plant water potential related to metabolism. The experimental plants are two cultivars of soybean (Giza 111 and Giza 21). The study is concerned mainly with internal adjustment in soluble metabolites affecting plant water relation. Such as soluble sugars (SS), hydrolysable carbohydrates (HC) among carbon metabolites and total free amino acids (AA) as nitrogenous components as well as soluble proteins which contribute water conservation in the plant. Statistical treatment of data helped much in clarifying the role of each of the four metabolic components in adjusting to the reduced water potential in the soil (water stress).
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