Selective Effects of Victorin on Growth and the Auxin Response in Avena1

AUTOR(ES)
RESUMO

Victorin, the pathotoxin from the host-specific pathogen, Helminthosporium victoriae, promotes the growth of coleoptile segments when given at concentrations that are high but which still show selective effects on susceptible and resistant tissue. The latent period in the growth response of both susceptible and resistant tissue is about 3.6 minutes compared to 11.0 minutes in the response of these tissues to auxin. The victorinpromoted rate of elongation of 8-millimeter segments is about 0.2 millimeter per hour in susceptible tissue and about 0.1 millimeter per hour in resistant tissue compared to about 0.4 millimeter per hour in response to auxin. At low concentrations, the toxin has no growth-promoting effect in either susceptible or resistant coleoptile segments. Over a wide range of concentrations, victorin inhibits the growth response of susceptible tissue to auxin completely while having no effect on the response of resistant tissue to auxin.

ACESSO AO ARTIGO

Documentos Relacionados