Formation and Germination of Septoria tritici Secondary Conidia as Affected by Environmental Factors

摘要

The effects of medium, isolate, temperature, light and pH on the formation and germination of Septoria tritici secondary conidia were tested. Of the six media tested, the malt-yeast extract agar was the best and generated 1.82 x 10# conidia/plate. The ten isolates tested showed different ability of conidia production. Darkness significantly reduced conidial formation and enhanced the transition of intermediates. The conidial germination and germ tube growth was strongly inhibited at 30pC. The suitable pH for conidial budding in malt-yeast broth (MYB) was between 5 and 9. At pH 2, 10 and 11, almost no new conidia were formed. The number of conidia reached 1.27 x 10i conidia/ml after 7 days in MYB, significantly more than that in potato dextrose broth, wheat leaf extract and HO.