Growth, phosphorus uptake, and water relations of safflower and wheat infected with an arbuscular mycorrhizal fungus

摘要: SUMMARY Safflower (Carthamus tinctorius L. cv. S555) and spring wheat (Triticum aestivum Anza) were grown with or without the arbuscular mycorrhizal fungus Glomus etunicatum Becker & Gerd., under environmentally controlled conditions. Soil phosphate concentrations adjusted before planting to produce (M) non-mycorrhizal (NM) plants that had similar leaf areas root length densities at same stage of development initiating drought stress treatments. Drought did not affect amount infection in safflower wheat. Interactions between water treatments on plant growth phosphorus uptake limited only occurred NM 28% greater shoot d. wt, slightly densities, 39% P acquisition than M when well watered conditions, but droughted conditions size tissue contents similar. Mycorrhizas stomatal behaviour during either wheat, i.e., transpiration conductance declined independently as soil was depleted potentials declined. Therefore, alter intrinsic hydraulic properties plant/soil system. Whilst maintained turgor recently expanded leaves severe not, no effect species.