Nicotiana benthamiana plants deficient in fucosyltransferase activity

A Nicotiana benthamiana plant, cell, part, seed, or progeny thereof, comprising at least three knock-out alfa(1,3)-fucosyltransferase genes, wherein one or more of the knock-out alfa(1,3)-fucosyltransferase genes is a mutated version of a native alfa(1,3)-fucosyltransferase gene selected from the group consisting of:

• a. FucTA gene containing a G to A substitution at position 355 of SEQ ID NO:
• 1;
• b. FucTB gene containing a G to A substitution at position 3054 of SEQ ID NO:
• 4;
• c. FucTC gene containing a G to A substitution at position 2807 of SEQ ID NO:
• 7;
• d. FucTD gene containing a G to A substitution at position 224 of SEQ ID NO:
• 10;
• and
• e. FucTE gene containing a G to A substitution at position 910 of SEQ ID NO:
• 13.