Gibberellin-like Compounds from Two Ectomycorrhizal Fungi and the GA3 Response on Scotch Pine Seedlings

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Abstract
The ectomycorrhizal fungi Pisolithus tinctorius (Pers.) Coker & Couch and Thelephora terestris (Ehrh) Fr. form symbiotic relationships with pine seedling roots. Significant quantities of gibberellin-like compounds were detected in the filtrates of both P. tinctorius and T. terestris using the lettuce hypocotyl bioassay. To evaluate gibberellin effects on the host physiology, pine (Pinus sylvestris L.) seedlings were treated biweekly with 0 to 100 mg·liter-1 gibberellic acid for 3 months. Treatment did not influence fresh weight, dry weight, or sugar content in either roots or shoots. Gibberellin treatments significantly decreased starch in both the shoots and roots, and increased shoot length linearly.

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