Como Seleccionar y Cultivar Plantas En Maceta by Helmut Jantra

By Helmut Jantra

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Some cultivars of cabbage and Brussels sprouts also contain significant amounts of methylthiopropyl and methylthiobutyl glucosinolates. B. ) and B. napus (swede) contain 3-butenyl- and sometimes 4-pentenyl glucosinolates and often their hydroxylated homologues. In addition to methionine-derived glucosinolates, phenylethyl glucosinolate usually occurs in low levels in many vegetables. Several surveys of glucosinolate variation between cultivars of Brassica species have been reported, for example B.

2003). It has been suggested that glucosinolates can act as a sulphur store so that in times of sulphur deficiency sulphur can be mobilized from glucosinolates into primary metabolism, although good evidence is lacking. The induction of glucosinolates following abiotic or biotic stresses has frequently been described. For example, pathogens (Doughty et al. 1995a), insect herbviores (Griffiths et al. 1994), salicylic acid (Kiddle et al. 1994), jasmonates (Bodnaryk and Rymeson 1994; Doughty et al. 1995b) all induce glucosinolates.

Sativum), onions (A. cepa) and leeks (A. porrum). Although biochemically and evolutionarily distinct from each other, both systems have a non-volatile substrate spatially separated from a glycosylated enzyme that, following tissue disruption, catalyses substrate hydrolysis to an unstable product that spontaneously and/or enzymically converts to an array of products, many of which are volatile and have important sensory properties. The myrosinase and alliinase enzymes are both associated with lectin-like proteins and have several isoforms of unknown biological significance.

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