The Inheritance of Aliphatic Glucosinolates inBrassica napus

摘要

AbstractThe inheritance of aliphatic glucosinolates was studied in crosses between syntheticB. napuslines and oilseed rape cultivars. Six unlinked loci are described which determine the aliphatic glucosinolate profile ofB. napus.One locus regulates the presence or absence of propyl glucosinolates, while another regulates the expression of pentyl glucosinolates. Two loci regulate the removal of the terminal H3CS‐group from the amino acid derivative to produce alkenyl glucosinolates as opposed to methylthioalkyl and methylsulphinylalkyl glucosinolates, regardless of the length of the alkyl chain. Likewise, another two loci regulate the hydroxylation of both butenyl and pentenyl glucosinolates. The functional alleles at one of the hydroxylation loci results in significantly more hydroxylation than those at the other locus. The large number of aliphatic glucosinolates which have been described inBrassicathus results from an interaction between genes which regulate side chain elongation and genes which modify the structure of the side chain, regardless of its length. The implications of this study for the biosynthesis of aliphatic glucosinolates, the origin ofB. napusand the potential to manipulate the leaf and seed glucosinolate profile of oilseed rape are discusse