Open AccessMarginal cross‐resistance to mosquitocidal Bacillus thuringiensis strains in Cry11A‐resistant larvae: presence of Cry11A‐like toxins in these strains
Author(s) -
Cheong Hosun,
Dhesi Roopvinder K,
Gill Sarjeet S
Publication year - 1997
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.1997.tb12605.x
Subject(s) - bacillus thuringiensis , microbiology and biotechnology , biology , toxin , culex quinquefasciatus , cross resistance , bacillales , bacillaceae , larva , bacteria , bacillus subtilis , botany , aedes aegypti , genetics
Culex quinquefasciatus mosquito larvae resistant to the Cry11A toxin showed marginal cross‐resistance to the multiple toxin crystals from B. thuringiensis subsp. israelensis and also to toxin crystals from three other mosquitocidal strains, i.e. B. thuringiensis subsp. fukuokaensis , subsp. jegathesan , and subsp. kyushuensis . Cross‐resistance patterns of the Cry11A‐resistant larvae to mosquitocidal strains of B. thuringiensis together with the immunological screening using antisera raised against Cry11A indicated the presence of Cry11A‐like toxins in these strains and could be used as a screening tool for the identification of novel toxins. The Cry11A‐resistant larvae had significantly less resistance to the Cry11B toxin from B. thuringiensis subsp. jegathesan . The occurrence of cytolytic toxins in all of these mosquitocidal strains partially explains the marginal cross‐resistance observed with multiple toxin crystals since each of these crystals also contains cytolytic toxins.