ペンタクロロベンジルアルコール (PCBA) のいもち病菌胞子形成阻害現象について

概要

論文の詳細を見る
Pentach1orobenzyl alcoho1 (PCBA) is one of the most effective fungicides for the control of rice blast. When blast-infected rice seed1ings on a nursery bed outdors were sprayed with PCBA at 1000 μg/ml, spore scattering from the infected seed1ings was markedly inhibited from 2nd to 10th day after the spraying. Sporulation on lesions of the sprayed leaves was greatly suppressed during this period. When the leaves, on which PCBA had been sprayed, were detached and incubated at 28℃ in a moist chamber, spores were produced as we11 as on leaves from unsprayed seed1ings. The same result was obtained with the test using rice seed1ings grown and inoculated under greenhouse conditions. On the contrary, phenylmercuric acetate (PMA, Hg-30 or Hg-20 μg/ml) and blasticidin-S (Bc-S, 20 or 10 μg/ml) inhibited the sporulation both on leaves of growing plants and on detached leaves. When these three compounds were sprayed on myce1ial mats grown on a agar medium in petri dishes, PCBA did not inhibit the sporulation, whereas PMA and Bc-S, each at 40 μg/ml, inhibited the sporulation by about 100 per cent. These results clearly indicate that sporulation-1nhibitinge effect of PCBA is not caused by the direct contact of the compound with the fungus but is caused by an interaction between the compound and the growing rice plant.
日本植物病理学会の論文
1968-02-29