Zs. P. Komáromy szerk.: Studia Botanica Hungarica 12. 1977 (Budapest, 1977)
P. Komáromy, Zsuzsa; Kecskés, Mihály: Néhány kék és zöld talajalga diquat-dibromid érzékenysége
A kísérletben szereplő algafajok esetében a 10 ppm-es diquat-dibromid oldat algasztatikus koncentrációnak, az 1 000 ppm-es oldat pedig letalis koncentrációnak tekinthető. Zs. P. KOMÁROMY and M. KECSKÉS: The diquat-dibromide sensitivity of some blue-green and green soil algae The 1 ppm diquat-dibromide inhibited the multiplication of both the bluegreen and green algae resulting in the prolongation of the "lag" phase after re-inoculation. Morphological deformation was not observed in any tested species. On the effect of 10 ppm herbicide the Nostoc paludosum and N, linckia originally olive-green colonies discoloured into pale blue grey in smaller or bigger spots. This may be supposed due to the destruction of chlorophyll "a". In these "spots" the cells were elongated losing their original shape and the mass of pulley-shaped cells was observed. The filaments had broken into pieces and the heterocysts had separated. In the thicker parts of the colonies the injury was somewhat smaller and on re-inoculation after a longer "lag" phase, though the surviving cells multiplied again, the growth of the cultures was very underdeveloped compared to the control cultures. In the case of Phormidium foveolarum cultures the discolouration occurred, the filaments were broken into pieces as described above and the seath became slimy. After re-inoculation a longer "lag" phase was followed and a slow growth was noticed. The Chlorhormidium flaccidum cultures in the media containing 10 ppm diquat-dibromide discoloured and on shrinking of the cell content the cells were destroyed. In the Chlorella cultures the cell wall, pyrenoida became brownish and the chloroplasts shrinked but eventually most cells multiplied after a longer "lag" phase and the number of cells increased. On the effect of 100 ppm diquat-dibromide only a few cells of the Phormidium foveolarum and Chlorella pyrenoidosa survived and after re-inoculation followed by a very long "lag" phase some growth was observed. In the case of the 1 000 and 10 000 ppm diquat-dibromide treatments all the cultures of the tested five species were destroyed. Among these species the strains of Nostoc paludosum and N. linckia proved to be moderately sensitive to the tested herbicide, the most sensitive was the Chlorhormidium flaccidum and relatively the most resistant strains were Phormidium foveolarum and Chlorella pyrenoidosa .
