By Haim D Rabinowitch, Lesley Currah

The Alliums are the most historic cultivated plants and comprise onions, garlic, leeks and different comparable vegetation. the first goal of this booklet is to collect, in one quantity, updated wisdom bought via various clinical disciplines, from the fundamental molecular point, to software within the box, of the allium plants. It comprises commissioned chapters on themes that experience proven significant advances rather within the final 10 years resembling molecular biology, floriculture and agronomy. individuals contain best global experts from Europe, the united states, Japan and New Zealand.

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Top onion, tree onion, Egyptian onion, Catawissa onion. These plants are hybrids between A. fistulosum and the common onion type of A. cepa, and were named A. × proliferum in its narrow sense. Most or all of the flowers in an inflorescence do not develop, but some bulbils (topsets) grow instead. These may sprout while still on the mother plant. Flowers, if developed, are completely sterile. The plants are widely cultivated in home gardens in North America, Europe and north-eastern Asia for their topsets and young sprout leaves.

The study of other wild populations is essential (Klaas, 1998). Recent evidence indicates that A. , 1997, 2000). Allium × proliferum (Moench) Schrad. It has been shown recently that some minor cultivated taxa, formerly thought to be varieties of A. cepa or A. fistulosum, or which were described as distinct species, are in fact hybrids of these two species. , 1983), biochemical and molecular data (Havey, 1991; Friesen and Klaas, 1998) and isozyme analysis (Maaß, 1997a) have univocally confirmed the hybrid nature of the plants in question.

The flower and the capsule, have been very little affected by domestication and exhibit no striking variations. 2 Infraspecific classification The great variability within the species has led to different proposals for infraspecific groupings, whose historical development has been discussed in detail by Hanelt (1990). Kazakova (1978) presented the most recent version of a classical system which held shallots apart at species level and recognized three formal subspecies, eight formal varieties and 17 cultivar groups (named conculta) based exclusively on quantitative characters.

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