Effect of selenium foliar application on oil yield, fatty acid composition and glucosinolate content of rapeseed cultivars under late-season thermal stress

Abdoreza Davoudi,Amirhosein Shirani-Rad,Varahram Rashidi,Farhad Farahvash,Bahram Mirshekari

doi:10.1051/ocl/2019027

Abdoreza Davoudi, Amirhosein Shirani-Rad + Show 3 more

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https://doi.org/10.1051/ocl/2019027

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Abstract

To determine the possible protective and enhancer role of selenium foliar application on oil yield, fatty acid composition and glucosinolate content of rapeseed cultivars under late-season thermal stress, a factorial split-plot experiment based on randomized complete block design with three replications was carried out in Karaj, Iran during the two growing seasons 2014–2015 and 2015–2016. Three sowing dates (Oct. 7 as normal planting date), (Oct. 17 as semi-late planting date), (Oct. 27 as late planting date) and two selenium foliar application (non-application as control and sodium selenate as foliar application) were factorially randomized to main plots, and rapeseed cultivars were allocated to sub-plots. Plant materials were six cultivars including three hybrids and three Iranian open pollinated varieties. Late-season thermal stress caused by late planting date reduced oil yield, oil content, oleic acid, linoleic acid, palmitic acid and increased linolenic acid, erucic acid and glucosinolate content of investigated cultivars. The results of this study demonstrated that the highest amount of oil yield, oil content, oleic acid, linoleic acid, palmitic acid and the lowest amount of erucic acid and glucosinolate content were observed in L72 cultivar in both control and selenium application treatments. This study provided new important findings about the supportive and enhancer role of selenium in the form of sodium selenate on quantity and quality of oil in rapeseed plant.

Highlights

Rapeseed (Brassica napus L.) is one of the most important oilseeds in the world that is considered as the third provider of edible oil after oil palm and soybean
The results showed that oil content and oil yield were decreased in late planting dates but selenium treatment, as a supporting role, was able to reduce the adverse effects of end-season thermal stress in rapeseed cultivars
It can be concluded that late planting date influenced oil content, oil yield and fatty acid composition and glucosinolate content of rapeseed cultivars

Summary

Introduction

Rapeseed (Brassica napus L.) is one of the most important oilseeds in the world that is considered as the third provider of edible oil after oil palm and soybean. With the lowest content of saturated fatty acids, rapeseed is one of the most important sources of vegetable oils for human diet (Nelson and Grombacher, 1992), industrial and pharmaceutical consumptions (Carvalho et al, 2006). Rapeseed is a long-day plant that grows well if it is sown on an appropriate sowing date (Shirani-Rad et al, 2015a). Following proper agronomic practices, including setting a suitable sowing date, will help increase yield and produce high-quality oil (Shirani-Rad et al, 2015b). Planting date is one of the main factors in rapeseed production affecting crop yield and other agronomic traits. Most previous studies have revealed that late planting date results in low yields (Hocking and Stapper, 2001; Oz, 2002; Ozer, 2003; Shah and Rahman, 2009; Uzun and Furat, 2009; Singh et al, 2017)

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