Allium crop science : recent advances by Haim D Rabinowitch, Lesley Currah

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By Haim D Rabinowitch, Lesley Currah

The Alliums are the most old cultivated vegetation and contain onions, garlic, leeks and different comparable crops. the first target of this e-book is to collect, in one quantity, up to date wisdom acquired via various clinical disciplines, from the fundamental molecular point, to software within the box, of the allium vegetation. It includes commissioned chapters on issues that experience proven significant advances quite within the final 10 years comparable to molecular biology, floriculture and agronomy. individuals comprise top international experts from Europe, the us, Japan and New Zealand.

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However, the results of crossing experiments (van Raamsdonk and de Vries, 1992a) and of recent molecular studies show the isolated position of A. oschaninii as a sister group to the A. cepa/A. vavilovii evolutionary lineage (Friesen and Klaas, 1998). Therefore, the Cepa alliance is proposed as a fourth informal group. 1. Galanthum alliance. White flowers with spreading tepals and filaments above the adnation to the tepals, coalescent into a narrow ring, are characteristic. Nectariferous tubes end in a tangentially widened pocket.

This rather cumbersome classification of A. cepa involves statistical methods. The characteristics used are affected strongly by environment and need to be tested in a range of climates. Also, in modern breeding, many ‘classical’ cultivar groups have been crossed and the boundaries between the different taxa are becoming blurred, making it difficult to place material within the scheme. The broadly accepted concept of the species A. cepa used here includes races with many lateral bulbs and/or shoots, which rarely bolt, and which are partly seed-sterile, namely shallots and potato onions.

Distribution is concentrated in the Turkestanian province. 3. Cepa alliance. The taxa share most characters with the Oschaninii alliance but the flowers may also be greenish and the leaves are initially flat or semi-cylindrical. Distribution is mainly Turkmenian–Iranian. 4. Altaicum alliance. These species have campanulate to broadly tubular flowers of a whitish–transparent colour. Filaments are distinctly longer than in the other alliances and do not coalesce into a ring. Nectariferous tubes end in a simple lateral hole.

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