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Arthrobotrys oligospora  is a typical nematode-trapping fungus capturing free-living nematodes by adhesive networks. Component of the low-affinity calcium uptake system (LACS) has been documented to involve in growth and sexual development of filamentous fungi. Bioassay showed incapacity of trap formation in  A .  oligospora  on Water Agar plate containing 1 mM ethylene glycol tetraacetic acid (EGTA) due to Ca 2+  absorbing block. The functions of homologous proteins ( AoFIG_1  and  AoFIG_2 ) of LACS were examined on conidiation and trap formation of  A .  oligospora . Compared with wild type,  ΔAoFIG_1  (AOL_s00007g566) resulted in 90% of trap reduction, while  ΔAoFIG_2  (AOL_s00004g576) reduced vegetative growth rate up to 44% and had no trap and conidia formed. The results suggest that LACS transmembrane protein  fig1  homologs play vital roles in the trap-formation and is involved in conidiation and mycelium growth of  A .  oligospora . Our findings expand  fig1  role to include development of complex trap device and conidiation.

scientific reports

Role of Low-Affinity Calcium System Member Fig1 Homologous Proteins in Conidiation and Trap-Formation of Nematode-trapping Fungus Arthrobotrys oligospora