The present invention provides a means for accurately discriminating whether an onion is an onion with no pungent taste and/or tear-inducing property. The present invention relates to a method of discriminating traits of an onion, comprising a first determination step of determining presence of the nucleotide sequence of SEQ ID NO:1 corresponding to alliinase gene 1 in a nucleic acid derived from the onion, and a second determination step of determining presence of the nucleotide sequence of SEQ ID NO:2 corresponding to alliinase gene 2, wherein the onion is discriminated to be an onion with no pungent taste and/or tear-inducing property if the presence of the nucleotide sequence of SEQ ID NO:1 is not determined in the first determination step and the presence of the nucleotide sequence of SEQ ID NO:2 is determined in the second determination step.

The present invention provides a means for accurately discriminating whether an onion is an onion with no pungent taste and/or tear-inducing property. The present invention relates to a method of discriminating traits of an onion, comprising a first determination step of determining presence of the nucleotide sequence of SEQ ID NO:1 corresponding to alliinase gene 1 in a nucleic acid derived from the onion, and a second determination step of determining presence of the nucleotide sequence of SEQ ID NO:2 corresponding to alliinase gene 2, wherein the onion is discriminated to be an onion with no pungent taste and/or tear-inducing property if the presence of the nucleotide sequence of SEQ ID NO:1 is not determined in the first determination step and the presence of the nucleotide sequence of SEQ ID NO:2 is determined in the second determination step.

The present specification discloses a dry PRENCSO composition improved in storage stability, and a lachrymatory factor generating kit comprising the composition. The dry PRENCSO composition according to the present disclosure comprises PRENCSO and saccharide. The present disclosure also relates to a method for producing a dry PRENCSO composition, the method comprising drying a solution containing PRENCSO and saccharide. The present disclosure also relates to a lachrymatory factor generating kit comprising the dry PRENCSO composition, and a dry enzyme composition comprising alliinase and a lachrymatory factor synthase (LFS) and being dried. The present disclosure also relates to a method for generating a lachrymatory factor by contacting water with the dry PRENCSO composition and the dry enzyme composition.