Disclosed are plant DNA molecules encoding C-14 sterol reductase polypeptides, as well as plant DNA molecules encoding polypeptides having at least 50% identity to the Arabidopsis C-14 sterol reductase; and vectors, cells and plants expressing such DNA. Also provided are methods for modifying the phenotype of a plant by expressing a C-14 sterol reductase DNA molecule in either sense or antisense orientations.

São divulgadas as moléculas do DNA da planta que codificam polypeptides do reductase do sterol C-14, as.well.as as moléculas do DNA da planta que codificam os polypeptides que têm ao menos a identidade de 50% ao reductase do sterol de Arabidopsis C-14; e vetores, pilhas e plantas expressando tal DNA. São fornecidos também os métodos para modificar o phenotype de uma planta expressando uma molécula do DNA do reductase do sterol C-14 em orientações do sentido ou do antisense.

 
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