Effects of Mepiquat Chloride and Trinexapac-Ethyl on Oil Composition, Seed Yield and Endogenous Gibberellins in Flax

Abstract

-The aim of this field experiment was to investigate the possible effects of mepiquat chloride (TE) and trinexapac-ethyl (MC) on oil composition, seed yield and endogenous gibberellins content of flax cultivar. Foliar application of plant growth retardants mepiquat chloride (0.897, 1.794 and 2.691 kg a.i. ha -1 ) and trinexapac-ethyl (0.756, 1.512 and 2.668 kg a.i. ha -1 ) had significantly increased seeds ripening rate and seed yield. In contrast, plant height was decreased by foliar application of MC and TE. The application of MC significantly increased seed oil yield (730 kg ha -1 by 27.0%) compared to the control. Seed and oil yield, and unsaturated fatty acids (oleic acid, linoleic acid and linolenic acid) were increased by foliar application of MC.

Combined Effects of Mepiquat Chloride and Trinexapac-ethyl on Oil Content, Lignan, Seed Yield and Endogenous Gibberellins in Flax (Linum usitatissimum L.)

“…The combination treatment of lower MC and elevated TE (treatment T2, T3, T4) was found to have a significant effect over control compared to the higher MC and elevated TE (treatment T5, T6, T7). In a previous study, we reported that single MC treatment had a higher seed ripening than TE treatment (Kim et al, 2011). In this study, however, combined treatment of MC with TE gave a lower seed ripening rate than that of single MC treatment.…”

“…Farooqi and Sharma (1988) reported that plant growth retardant such as chlormequat chloride increased significantly oil contents and inhibited growth in Japanese mint. Kim et al (2011) reported that the foliar spray of single treatment with MC caused higher oil content than that of TE.…”

“…These results suggest that the equal combination of two plant growth retardants with same ratio affects partially changes of some unsaturated fatty acid and the combination of relatively high concentration of mepiquat chloride with low trinexapac-ethyl. In earlier study, it revealed that single treatment of MC increased oil content when MC concentration increased (Kim et al, 2011).…”

“…In a past study, it revealed that foliar application of mepiquat chloride increases seed oil content and promotes unsaturated fatty acids in flax (Kim et al, 2011). Considering the above mentioned information, the field experiment was conducted to study the response of combined plant growth retardants both mepiquat chloride and trinexapac-ethyl on the change of seed yield, oil and lignan content, and endogenous gibberellin levels in flax plant.…”

Effects of Gibberellin Biosynthetic Inhibitors on Oil, Secoisolaresonolodiglucoside, Seed Yield and Endogenous Gibberellin Content in Flax

“…We have focused on changes of endogenous gibberellins to get a better understanding together with better agronomic practices. In a previous study, it was revealed that foliar application of mepiquat chloride increases seed oil content and promotes unsaturated fatty acids in flax (Kim et al, 2011). The present study aimed to evaluate the optimal concentration of plant growth retardants in order to increase seed yield and oil content in flax plants.…”