Ontogenetic changes of 2-propenyl and 3-indolylmethyl glucosinolates in Brassica carinata leaves as affected by water supply.
Concentrations of 2-propenyl and 3-indolylmethyl glucosinolates in two lines of Brassica carinata (Holeta-1, 37-A) were assessed during the vegetative lifecycle under optimal or drought-inducing water supply conditions. In the well-watered treatment 2-propenyl and 3-indolylmethyl glucosinolate concentrations remained almost constant from the 6-8 to the 15-16 leaf stage, whereas drought-induced water supply led to a distinct increase of these glucosinolates. Generally the 2-propenyl concentration was higher in Holeta-1 at each leaf stage under drought stress compared with 37-A indicating a B. carinataline-specific drought response. The drought-induced glucosinolate accumulation seems to be integrated in the plant’s process of osmotic adjustment. It seems that under drought there is a shift from primary to secondary metabolism, thereby promoting glucosinolate synthesis. Thus, by keeping the relative soil water content below 80% glucosinolate concentrations could be increased up to the 15-16 leaf stage, resulting in better plant nutritional quality of B. carinata.
Schreiner, M.; Beyene, B.; Krumbein, A.; Stützel, H. 2009. Ontogenetic changes of 2-propenyl and 3-indolylmethyl glucosinolates in Brassica carinata leaves as affected by water supply. Journal of Agricultural and Food Chemistry 57, 7259-7263.