ECTOMYCORRHIZAE AND RATE OF WATER DEFICIT DEVELOPMENT INFLUENCE PHOTOSYNTHESIS IN PINUS TAEDA L. SEEDLINGS

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  • 1 IFAS, University of Florida, Fort Lauderdale, FL 33314
  • | 2 Department of Horticultural Sciences, Texas A&M University, College Station, TX, 77843.

Pinus taeda L. seedlings inoculated with the ectomycorrhizal fungus, Pisolithus tinctorius, were grown in a glasshouse for eight months, and then subjected to rapidly developing cyclic water deficits, or to a single slowly developing water deficit. Water deficits developed at a rate of -0.16 MPa per day (predawn total water potential) for five cyclic water deficits, and at -0.04 MPa per day for the slow water deficit. In unstressed seedlings, carbon exchange rates (CER) did not differ between noninoculated and inoculated seedlings. During slow water deficit development, CER steadily declined. During rapid water deficit development, CER remained unchanged, then declined rapidly when water potentials fell below -1.3 MPa. Inoculated seedlings had higher CER when water potential was lower than -1.5 MPa.

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