Abstract
The Stagonospora cirsii mycelium is considered as the infectious basis of a potential mycoherbicide for the control of Canadian thistle and perennial sow thistle. Successful commercialization of mycoherbicides is often constrained by poor drying survival. In this study was shown that the highest viability of mycelium S. cirsii during drying is achieved in the stationary phase of growth. The mycelium in the stationary phase is characterized by maximum level of carbohydrates. We suggest the level of arabitol as a criterion evaluation of the mycelium resistance to drying. Culturing conditions, and especially the fermentation time, allow prediction of polyols and trehalose levels, which are very critical in enhancing the storage life and efficacy of biological control agent.
Highlights
Canadian thistle (Cirsium arvense) and perennial sow thistle (Sonchus arvensis) are highly aggressive weeds of Asteraceae family
S. cirsii mycelium was obtained via cultivation in 250-mL flasks with 50 mL of liquid nutrient medium
The temperature conditions of the column thermostat were the following: initial temperature of 70 °C, increased by 6° C/min − 1 up to 340°C.The peaks were recorded by an Agilent 5975S mass selective detector (Agilent Technologies, US) in the total ion recording mode with a frequency of 1.8 scans per second
Summary
Canadian thistle (Cirsium arvense) and perennial sow thistle (Sonchus arvensis) are highly aggressive weeds of Asteraceae family. The strain selection, the adjustment sources of carbon and nitrogen and the duration of cultivation can influence on mycelium resistance to stress factors. Earlier it was shown that in the stationary phase of growth the S. cirsii strain C163 survives drying better than in other phases [2,3].
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