Cultivar

Cultivar is a term derived from the combination of cultivated and variety. It refers to plants that have been selected and propagated for specific, desirable characteristics that are maintained during propagation. Unlike botanical varieties, which are classifications based on natural traits and occur in the wild, cultivars are the result of human intervention through breeding and selection. Cultivars play a crucial role in agriculture, horticulture, and forestry by providing a diverse array of plants that meet human needs for food, aesthetics, and ecosystem services.

Definition and Characteristics

A cultivar is defined by the International Code of Nomenclature for Cultivated Plants (ICNCP) as a plant group that has been selected for a particular characteristic or combination of characteristics and that is clearly distinct, uniform, and stable in its traits through successive generations. The selection process involves human intervention, distinguishing cultivars from naturally occurring plant varieties.

Selection and Propagation

The development of a new cultivar can involve various techniques, including selective breeding, hybridization, genetic modification, and clonal propagation. The goal is to enhance specific traits such as yield, disease resistance, flower color, fruit size, and growth habit. Once a desirable plant is identified, it must be propagated in a manner that ensures the traits of the cultivar are reliably passed on to future generations. This can be achieved through sexual reproduction (seeds) or asexual reproduction (cuttings, grafting, or tissue culture).

Naming and Registration

Cultivars are named according to the rules set out by the ICNCP. Each cultivar name is unique and consists of the botanical name of the plant followed by the cultivar name in single quotation marks (e.g., Rosa 'Peace'). Cultivar names are often descriptive or honor a person or place. To avoid confusion and ensure consistency, cultivar names are registered with international or national cultivar registration authorities.

Importance of Cultivars

Cultivars are vital for enhancing food security, improving nutritional quality, and increasing the efficiency of food production systems. In horticulture, cultivars contribute to the diversity of plant materials available for landscaping, gardening, and the floral industry. They also play a significant role in forestry, where selected cultivars can improve timber quality, growth rates, and resistance to pests and diseases.

Challenges and Considerations

While cultivars have numerous benefits, there are also challenges associated with their use. The reliance on a limited number of cultivars can reduce genetic diversity, potentially making crops more susceptible to pests, diseases, and changing climate conditions. Additionally, the intellectual property rights associated with certain cultivars can raise ethical and accessibility issues.

Conclusion

Cultivars are a cornerstone of modern agriculture, horticulture, and forestry, providing a mechanism for enhancing and sustaining plant diversity tailored to human needs. The development and use of cultivars require careful consideration of genetic diversity, ecological impacts, and ethical implications to ensure that they contribute positively to sustainable plant production and biodiversity conservation.

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Cultivar

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  African daisy (Osteospermum sp. 'Pink Whirls')

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  Liberty Hyde Bailey 1858-1954

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  Triticum aestivum, Gewone tarwe

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  Airport orchid

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  Leucospermum cultivar

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  Viola x hybrida 'Clear Crystals Apricot', SC, Vic., 15.9.2007

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  Dahlia - "Akita" cultivar