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Stock

Stock

Matthiola incana (stock) is a species of flowering plant in the genus Matthiola. The common name "stock" usually refers to this species, though it may also be applied to the whole genus. The common name "night-scented stock" or "evening-scented stock" is applied to Matthiola longipetala (syn. bicornis).[1] M. incana is also known in the USA by the common names hoary stock and tenweeks stock. It is a common garden flower, available in a variety of colours, many of which are heavily scented and also used in floristry. ouble-flowered stocks are prized by gardeners for their floral display but are sterile. They therefore have to be produced from the seed of single-flowered plants. The double-flowered form is caused by a recessive gene variant (allele) in the homozygous condition. Therefore, according to the Mendelian laws of genetics, heterozygous single-flowered stocks should produce one quarter doubles in their offspring and one third of the singles should be pure breeding singles incapable of throwing doubles. double-flowered stock, Matthiola incana Selection over the centuries has greatly improved these ratios, resulting in the so-called "ever-sporting" stocks, in which pure-breeding singles are absent and the proportion of doubles is one half or greater. The reason was first worked out by the Danish geneticist √ėjvind Winge. In these varieties, the singleness allele is closely linked to a pollen-lethal gene.