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Cybrids OR Cytoplasmic Hybrids - Cybrids or cytoplasmic hybrids are cells or plants containing nucleus of one species but cytoplasm from both the parental species. They are produced in variable frequencies in normal protoplast fusion experiments due to one of the following:

(i) fusion of a normal protoplast of one species with an enucleate protoplast or a protoplast having an inactivated nucleus of the other species,

(ii) elimination of the nucleus of one species from a normal heterokaryon, or

(iii) gradual elimination of the chromosomes of one species from a hybrid cell during the subsequent mitotic divisions.

Cybrids may be produced in relatively high frequency by

(i) irradiating (with X-rays or gamma-rays) the protoplasts of one species prior to fusion in order to inactivate their nuclei, or

(ii) by preparing enucleate protoplasts (cytoplasts) of one species and fusing them with normal protoplasts of the other species.

The objective of cybrid production is to combine the plasmagenes of one species with the nuclear and cytoplasmic genes of another species. But the mitotic segregation of plasmagenes leads to the recovery of plants having plasmagenes of one or the other species only.

Cybrids provide the following unique opportunities:

(i) transfer of plasmagenes of one species into the nuclear background of another species in a single generation even in

(ii) sexually incompatible combinations,

(iii) recovery of recombinants between the parental mitochondrial or chloroplast DNAs (genomes), and

(iv) production of a wide variety of combinations of the parental and recombinant chloroplasts with the parental or recombinant mitochondria.

(v)The cybrid approach has been used for the transfer of cytoplasmic male sterility from Nicotiana tabacum to N. sylvestris1 from Petunia hybrida to P. axillaries, etc.

(vi) In addition, mitochondria from one parental species may be combined with the chloroplasts of the other parental species.

 
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