Reductase involved in lignan (-)-hinokinin biosynthesis. Catalyzes the enantioselective conversion of (+)-pinoresinol into (+)-lariciresinol and of (+)-lariciresinol into (-)-secoisolariciresinol. Abstracts the 4R-hydride from the NADPH cofactor during catalysis. Has also a low phenylcoumaran benzylic ether reductase activity. (+)-lariciresinol + NADP(+) = (+)-pinoresinol + H(+) + NADPH (-)-secoisolariciresinol + NADP(+) = (+)-lariciresinol + H(+) + NADPH Dimer. Knock-down mutants of PLR_Lc1 show unequivocally that (-)-hinokinin is synthesized via the (-)-secoisolariciresinol/(-)-matairesinol pathway and not via the piperitol/sesamin pathway. Belongs to the NmrA-type oxidoreductase family. Isoflavone reductase subfamily.