sentence: To investigate the function of five candidate genes ( C3 , C4 , C5 , C7 and C9 ) in salt stress tolerance , we constructed TRV2 : C3 , TRV2 : C4 , TRV2 : C5 , TRV2 : C7 and TRV2 : C9 vectors to silence the endogenous genes in TM-1 seedlings , with TRV :00 as the mock treatment and TRV2 : GhCLA1 ( Cloroplastos alterados 1 ) as the technical control .