Integration of Conservation Strategies of Plant Genetic ... - Genres

Table 2. Regeneration of crops
Crop Breeding system Pollination
mechanism
Isolation Number of
plants
Onion and leek Mostly CP Insects Gauze cages 80 - 150
Barley SP - 1) ± 200
Beets Mostly CP Wind Hemp/ Greenhouses
50 - 60
Cole crops Mostly CP Insects Gauze cages 80 - 150
Tomato SP - - 5
Pepper SP - - 5
Eggplant SP - - 5
Clover CP Insects Rye fields ± 50
Cocksfoot CP Wind Rye fields ± 50
Lettuce SP - - 8 - 16
Miscellaneous
crucifers
Mostly CP Insects Rye fields 50 - 100
Faba beans Often CP Insects Rye fields ≥ 100
Rye-grass CP Wind Rye fields ± 50
Lupin CP Insect Rye fields ≥ 100
Maize Mostly CP Wind Bagging 100
Oats SP - - ± 200
Peas SP - - ≥ 50
Spinach Mostly CP Wind Greenhouse
compartments
Timothy CP Wind Rye fields ± 50
Wheat SP - 1) ± 200
CP= Cross pollinating, SP= (Predominantly) self pollinating.
1) Only wild species in greenhouse.
A very important aspect of regeneration is the production of healthy, viable seeds. In general,
regenerations under glass yield better quality seeds compared to accessions regenerated in the
field.
Germplasm that is distributed by genebanks, must be carefully checked for the presence of seedborne
pathogens and pests, so that it does not contribute to the spreading of diseases and pests.
It should provide an uncontaminated basic stock for breeding programmes. CGN maintains a high
standard of disease and pest control, including pathogens with no official quarantine status, such
as Lactuca Mosaic Virus.
80