Abstract
The megametophytes of <em>Picea abies</em>, <em>Pinus sylvestris</em>, <em>Pinus mugo</em> and <em>Larix decidua</em> were cultured on modified solid agar MS medium with 5 mg.l<sup>-1</sup> α-naphthaleneacetic acid and 0.1 mg.l<sup>-1</sup> 6-benzylaminopurine and exposed to a tester, the basidio-mycete <em>Phaeolus schweinitzii</em>. The megagametophytes of all tested species showed defense reactions manifested by inhibition of mycelial growth. The weakest defense reactions were shown by the megagametophytes of <em>Picea abies</em> and <em>Larix decidua</em>. The strongest defense reactions were found in <em>Pinus sylvestris</em> and <em>Pinus mugo</em> megagametophytes.
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