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This article in CS

  1. Vol. 30 No. 6, p. 1272-1275
     
    Received: Dec 18, 1989
    Published: Nov, 1990


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doi:10.2135/cropsci1990.0011183X003000060023x

Viability of Acremonium coenophialum in Tall Fescue Seed after Ionizing Radiation Treatments

  1. A. M. Bagegni,
  2. D. A. Sleper ,
  3. H. D. Kerr and
  4. J. S. Morris
  1. Univ. of Missouri, Columbia, MO 65211

Abstract

Abstract

Planting tall fescue (Festuca arundinacea Schreb.) seed free of the endophyte Acremonium coenophialum Morgan-Jones & Gains allows establishment of swards free of the fungus. Eradication of the fungal endophyte from infected tall fescoe seeds containing 130 g kg−1 moisture using ionizing radiation was investigated. Three sources of radiation were used: gamma rays (60Co source), neutron particles (252Cf source), and a thermal neutron beam. The percent germination of tall fescue seeds among gamma doses did not differ significantly (P < 0.05) from the control treatment and did not show a significant negative response (R2 = 0.41) to increasing levels of gamma radiation. At 250 Gy of gamma radiation, percent germination after 14 d was still =90%. Percent seed germination of tall fescue and high levels of radiation were negatively correlated for both sources of neutrons. Gamma radiation was shown to reduce (P < 0.01) the percent of the viable endophyte to =10% of control. The 2s2Cf and thermal neutrons reduced the percent of tall fescue infected by the endophyte to =30% without deleterious effects on seed germination.

Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree. Journal Series no. 10973.

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