Il peut s’agir par exemple d’un polynucléotide ou acide nucléique codant pour une protéine de fusion selon l’invention dans lequel la séquence polynucléotidique ou acide nucléique codant pour un polypeptide comprenant le domaine hydrophile d’un cytochrome P450 de plante est choisi dans le groupe comprenant l’acide nucléique de séquence : cctggcccaatcccggttccaattttcggcaactggctacaagttggcgatgatttgaaccaccggaacttaaccgatctggctaagaggtttggtgagatcttgctgctacgcatggggcagaggaatctggtagttgtgtcttcgcctgagcttgctaaagaggtgttgcatacacaaggagtggagtttggttcgagaacaaggaatgttgtgttcgatatttttactgggaagggtcaggatatggtgtttacggtttatggtgagcattggaggaagatgaggaggatcatgaccgtaccctttttcaccaacaaagttgttcagcaatacaggtatgggtgggaggctgaggccgcggcggttgtggacgatgtgaagaagaatccggctgcagcaactgaaggaatcgtgatccgaagacggttacaactcatgatgtataacaacatgttcagaatcatgttcgacagacgattcgaaagtgaagatgatcccttgtttttgaaactcaaggcgttgaacggtgagaggagtcgattggcgcagagctttgagtacaactatggcgatttcatccctattttgcggccgtttttgagaaattatttgaagttgtgcaaggaagttaaagataaaaggattcagctcttcaaggattacttcgttgacgaaaggaagaagattggaagcactaagaaaatggacaacaatcagttgaaatgtgccattgatcacattcttgaagctaaagagaagggtgagatcaatgaagacaatgttctttacattgttgaaaacatcaatgttgcagcaatcgagacaactctatggtcgatcgaatggggaattgcggagctagttaaccatcccgagatccaagccaaactcaggcacgagctcgacaccaagctcgggcccggtgtccagatcaccgagcccgacgtccaaaacctcccttacctccaagccgtggtcaaggaaaccctccgtctccgtatggcgatcccgcttctagtcccacacatgaacctccatgacgctaagctcggcgggtttgacatcccggccgaaagcaagatcttggtcaacgcgtggtggttagcaaacaaccccgaccaatggaagaaacccgaggagtttaggccagagaggtttttggaagaggaagcgaaggttgaggctaacgggaatgattttaggtacttgccgtttggagtcgggagaaggagttgccccgggattattcttgcattgccgatacttggtattacaatcgggcgtttggtgcagaatttcgagctgttgcctccaccgggacagtctaagatcgataccgatgagaagggtgggcagtttagtttgcatatcttgaagcactctactatcgtagctaaacctaggtcattt (SEQ ID NO 11), atggacctcctcctcatagaaaaaaccctcgtcgccttattcgccgccattatcggcgcaatactaatctccaaactccgcggtaaaaaattcaagctcccacctggcccaatcccggttccaattttcggcaactggctacaagttggcgatgatttgaaccaccggaacttaaccgatctggctaagaggtttggtgagatcttgctgctacgcatggggcagaggaatctggtagttgtgtcttcgcctgagcttgctaaagaggtgttgcatacacaaggagtggagtttggttcgagaacaaggaatgttgtgttcgatatttttactgggaagggtcaggatatggtgtttacggtttatggtgagcattggaggaagatgaggaggatcatgaccgtaccctttttcaccaacaaagttgttcagcaatacaggtatgggtgggaggctgaggccgcggcggttgtggacgatgtgaagaagaatccggctgcagcaactgaaggaatcgtgatccgaagacggttacaactcatgatgtataacaacatgttcagaatcatgttcgacagacgattcgaaagtgaagatgatcccttgtttttgaaactcaaggcgttgaacggtgagaggagtcgattggcgcagagctttgagtacaactatggcgatttcatccctattttgcggccgtttttgagaaattatttgaagttgtgcaaggaagttaaagataaaaggattcagctcttcaaggattacttcgttgacgaaaggaagaagattggaagcactaagaaaatggacaacaatcagttgaaatgtgccattgatcacattcttgaagctaaagagaagggtgagatcaatgaagacaatgttctttacattgttgaaaacatcaatgttgcagcaatcgagacaactctatggtcgatcgaatggggaattgcggagctagttaaccatcccgagatccaagccaaactcaggcacgagctcgacaccaagctcgggcccggtgtccagatcaccgagcccgacgtccaaaacctcccttacctccaagccgtggtcaaggaaaccctccgtctccgtatggcgatcccgcttctagtcccacacatgaacctccatgacgctaagctcggcgggtttgacatcccggccgaaagcaagatcttggtcaacgcgtggtggttagcaaacaaccccgaccaatggaagaaacccgaggagtttaggccagagaggtttttggaagaggaagcgaaggttgaggctaacgggaatgattttaggtacttgccgtttggagtcgggagaaggagttgccccgggattattcttgcattgccgatacttggtattacaatcgggcgtttggtgcagaatttcgagctgttgcctccaccgggacagtctaagatcgataccgatgagaagggtgggcagtttagtttgcatatcttgaagcactctactatcgtagctaaacctaggtcattttaa (SEQ ID NO 12), atggatattttcacctccttactgtatcttgctctcattcttttcttttctcttcaagtcttccgttcctttgcgtttcctaaacacaaaaggcttccacctggtccaaaacctcgtcccatcatcggaagcctcttggagctcggcgaccaaccccacaggtccttggccaggctttccgagtcttacggcccgtttatgcatttgaagctcggccaagtcacgacggttgtcatttcctccaccaccatggctaaagaagtcctccaggcaaacagccaagtcgtctccagccggacaatcaccgacgcaagccgcgcccacagacacagcgattttagcatggttatgttgcccgtatcccctctgtggcgaaaccttcggaaaataagcaactcacacttgctttcctccaaggctcttgatggcaacatggagctgagaaacaaaaaggtgcaagagctcctaaatgatgtccacaaaagcgtccaggccggggaggcggtggagatcgcgagcctttctttcagagctactctgaatctcttgtccaccacatttttctccatggacatggcggatgacacaaattccgtcactctaaaagagctcaaggaggctatgtcgcacatgatggaagagttggggaagcctaacttggccgattatttcccgtttctacaaaagattgacccccaaggcattaggcggcgcaacacggttactttccggaaactgatcaacttgtttgggcgtatcatcgaccaaagattgaaagtgagagaagcgagtggttctttgaaagatgatgatattttagacactcttatcaacatgatggtggtggatcaggagaagaaagaggatcagcttgacaaaaccataattgaacattttttactggatttattttcagcggggactgaaacgacttcaaccacgttggagtgggcaatggctgagctagtaaaagcgccagagattatgtcaaaagcccgagcagagctagatcaagttataggcaaaggaaaccaagtgaaggaatcggacgtatctcgactcccttacttacaagccattgttaaagaaaccttccgcatgcaccctacagctccattattgattcctcgcaaagccgacagtgacatcgaaatctccgactatatcatcccgaaggatgctcaggtgattgtcaatgtatgggccattggtagagactcaagcacatgggaaaatcccgacaagtttataccggagaggtttttggacatcgatatagatgtcggaggccgggattttaagctcattccgttcggtgctggtcggagaatatgtcccggattcccattggcgatgcgaatgttgcacttgatgttggggtctttgcttcactcgtttgattggaagttggaagatggggttagacctgatgctctaaacatggatgaaaagtttggcctcaccttgcaaatggctcagcctttgcgagctatccccgtgccgacaaagcattag (SEQ ID NO 13), atcatcggaagcctcttggagctcggcgaccaaccccacaggtccttggccaggctttccgagtcttacggcccgtttatgcatttgaagctcggccaagtcacgacggttgtcatttcctccaccaccatggctaaagaagtcctccaggcaaacagccaagtcgtctccagccggacaatcaccgacgcaagccgcgcccacagacacagcgattttagcatggttatgttgcccgtatcccctctgtggcgaaaccttcggaaaataagcaactcacacttgctttcctccaaggctcttgatggcaacatggagctgagaaacaaaaaggtgcaagagctcctaaatgatgtccacaaaagcgtccaggccggggaggcggtggagatcgcgagcctttctttcagagctactctgaatctcttgtccaccacatttttctccatggacatggcggatgacacaaattccgtcactctaaaagagctcaaggaggctatgtcgcacatgatggaagagttggggaagcctaacttggccgattatttcccgtttctacaaaagattgacccccaaggcattaggcggcgcaacacggttactttccggaaactgatcaacttgtttgggcgtatcatcgaccaaagattgaaagtgagagaagcgagtggttctttgaaagatgatgatattttagacactcttatcaacatgatggtggtggatcaggagaagaaagaggatcagcttgacaaaaccataattgaacattttttactggatttattttcagcggggactgaaacgacttcaaccacgttggagtgggcaatggctgagctagtaaaagcgccagagattatgtcaaaagcccgagcagagctagatcaagttataggcaaaggaaaccaagtgaaggaatcggacgtatctcgactcccttacttacaagccattgttaaagaaaccttccgcatgcaccctacagctccattattgattcctcgcaaagccgacagtgacatcgaaatctccgactatatcatcccgaaggatgctcaggtgattgtcaatgtatgggccattggtagagactcaagcacatgggaaaatcccgacaagtttataccggagaggtttttggacatcgatatagatgtcggaggccgggattttaagctcattccgttcggtgctggtcggagaatatgtcccggattcccattggcgatgcgaatgttgcacttgatgttggggtctttgcttcactcgtttgattggaagttggaagatggggttagacctgatgctctaaacatggatgaaaagtttggcctcaccttgcaaatggctcagcctttgcgagctatccccgtgccgacaaagcattag (SEQ ID NO 14), de préférence de séquence SEQ ID NO 11.