In most plants, seeds are produced as a result of fertilisation of an ovule by a pollen cell. In a few plants (e.g., citrus, mango), embryos can also be produced directly from maternal tissue (the nucellus), without any fertilisation by pollen. Seeds with nucellar embryos are called nucellar seeds, and they have two agricultural advantages. First, like true seeds, they do not carry virus diseases, or any of the other parasites whose transmission is blocked by seed propagation. Second, they are genetically identical to the female parent, and they constitute a form of vegetative propagation . Nucellar seeds can thus be used to produce clones, with few of the dangers of transmitting parasites that are normally associated with vegetative propagation . See also: Apomixis. Nucellus
The nutritive maternal tissue surrounding an ovule. Nucleus
That part of a Eucaryote cell that contains the chromosomes. Nutmeg
See: Myristica fragrans.
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