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Effect of cultivar and harvest date on the glucosinolate and s‐methylcysteine sulphoxide content of swedes ( Brassica napus ssp rapifera )
Author(s) -
Griffiths D Wynne,
Bradshaw John E,
Taylor Judith,
Gemmell Dorothy J
Publication year - 1991
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740560413
Subject(s) - glucosinolate , cultivar , bulb , brassica , dry matter , biology , horticulture , zoology , agronomy , botany
Eighteen plants of each of four cultivars and two inbred lines of swede (Brassica napus ssp rapifera L) were harvested at monthly intervals from 25 July 1988 to 6 March 1989 and divided into leaf and bulb (swollen hypocotyl). On average, the yield per plant of bulb dry matter increased from 51 g to 277 g on 14 November and then slowly fell to 241 g, whereas that of leaf dry matter decreased from 81 g to 17 g on 9 January and then rose to 32 g. Bulb S‐methylcysteine sulphoxide concentration increased from 5.9 g kg −1 DM to over 9.4 g kg −1 from 14 November to 9 January and then fell to 7.3 g kg −1 . Leaf SMCO concentration rose from under 5 g kg −1 DM to over 27g kg −1 on 6 February and then fell to 17 g kg −1 . Bulb glucosinolate concentration was 11.2 mM kg −1 DM on 25 July, then fluctuated between 7.9 and 6.5 mM kg −1 before falling below 5.0 mM kg −1 on 6 February. Leaf glucosinolate concentration rose from under 4 mM kg −1 DM to over 37 mM kg −1 on 6 February and then fell to 28 mM kg −1 . All cultivars showed these patterns despite some statistically significant cultivar × harvest date interactions. There were large and consistent differences between cultivars in glucosinolate composition. The implications for swede breeding are discussed.