Abstract
!Summary Shoot water relations and carbohydrate levels were compared for droughted nonmycorrhizal and vesicular-arbuscular (V A) mycorrhizal Rosa hybrida L. cv 'Samantha' plants grown with high and low phosphorus fertilization. Leaf diffusive conductance (g,) of plants colonized by Glomus intraradices Schenk and Smith and Glomus deserticola Trappe, Bloss and Menge were 2 x and 1.5 x greater, respectively, than in nonmycorrhizal plants. Regardless of P fertilization, leaf osmotic and bulk water potentials were 0.5 to 1.1 MPa higher in mycorrhizal than in nonmycorrhizal plants. Leaf starch, chlorophyll and water contents were higher InG. intraradices-colonized plants than .in the high-P nonmycorrhizal plants, while fructose, glucose and total soluble carbohydrates were lower. Level.of P fertilization had no effect on water relations or soluble cart .bohydrate content of nonmycorrhizal roses. The water status of droughted rose was improved more ,i by G. intraradices than by G. deserticola.
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