LOW-OXYGEN TREATMENT OF PREGERMINATED IMPATIENS SEEDS TEMPORARILY SUPPRESSES RADICLE ELONGATION

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  • 1 Department of Horticulture, Iowa State University, Ames, IA 50011

Generation of pregerminated seeds at a central facility and subsequent mechanical sowing at a remote facility require that radicle elongation during shipment be minimized. Low-oxygen treatments were applied to pregerminated `Super Elfin Salmon Blush' impatiens seeds to suppress radicle growth during a subsequent one-day simulated shipping period in air. In the first experiment, O2 concentrations of 0, 3, 7, 10, 13, and 20% were applied for 24 and 48hr. The 0% O2/24-hr and the 0% O2/48-hr treatments held the radicle length close to the desired length of 1.0mm, but both of these treatments decreasad 7-day hypocotyl length and percentage normal seedlings, when they were compared with the control treatment (untreated pregerminated seeds) In the second experiment, O2 concentrations of 0, 1, 2, 3, 7, and 20% were applied for 24 and 48hr. Five treatments (0, 1, and 2% O2/24-hr and 0 and 1% O2/48-hr) held the radicle to a length <1.0mm. Of these five treatments, only the 2% O2/24-hr treatment resulted in recovery parameters (7-day hypocotyl length and percentage normal seedlings) that compared with those of the control treatment.

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