En la presente descripci n se describe una planta mutante de origen no natural o transg nica o parte de esta que tiene expresi no actividad de asparagina sintetasa reducida dicha asparagina sintetasa comprende consiste o consiste esencialmente en (i) una secuencia de polinucle tido que comprende que O (III) a polypeptide that has at least 78% of the sequence with the sec. With ID number 2 or sec. With ID number 4 or sec. With ID number 6 or sec. Number: 8； the expression or activity of asparagina sintetasa displayed in (I)；(II) O (III) is smaller than the control facility. Requirement 11: method of preparing plant materials with low content of aspalagina and low content of acrylonitrile from plant materials in control plant, This method includes: (a) providing a plant or part of a plant containing polynucleotide, including:In other words, it is basically a sequence, encoding an asparagina sintetasa, with at least 90% of the sequences associated with the sec. With ID number: 1 or at least 72% with serial ID of the sec. With ID number 3 or sec. With ID number 5 or sec. No.: 7； (b) reduce the expression of polynucleotide or protein activity encoded in this way in plants or plant parts； (c) harvest plant materials or plant parts in plants； (d) dry or cure plant materials； (E) optional；1. Measure the level of asparagine in the factory or part of it and / or the level of acrylamide in the aerosol of the factory or part of it； and (f) obtain the cured or dried plant materials with the decrease of asparagine content and the decrease of propylene content in the aerosol in an appropriate way； The level of nicotine is basically the same as that of the control plant； where appropriate, the formation of glutamate, aspartic acid, and glutamate is increased compared to the curing or dry leaves of the control plant.En la presente descripción se describe una planta mutante, de origen no natural o transgénica o parte de esta que tiene expresión o actividad de asparagina sintetasa red
