Nitrogen and fungicide applications against Erysiphe cruciferarum affect quality components of oilseed rape

Abstract

Oilseed rape (Brassica napus L.) is one of the most important oilseed crops in temperate climates. Erysiphe cruciferarum is an important disease of oilseed rape and causes crop loss in warmer areas of Europe. The research investigated the effect of nitrogen fertilizer and fungicidal treatment against powdery mildew infection caused by E. cruciferarum of oilseed rape on seed components, including protein, oil, oleic acid, linolenic acid and undesirable substances such as sinapic acid esters (SAE) and glucosinolates (GSL), using near infrared spectroscopy (NIRS). Five susceptible oilseed rape varieties were employed in this research using four treatment groups: no nitrogen fertilization and no fungicidal treatment (N(0)-F(0)); no nitrogen fertilization but fungicidal treatment (N(0)-F(1)); and nitrogen fertilization but no fungicidal treatment (N(1)-F(0)); nitrogen fertilization and fungicidal treatment (N(1)-F(1)). Nitrogen fertilization increased the protein, but lowered the oil content, of the seeds. Fungicidal treatments significantly increased oil contents in all varieties tested, however reduced protein levels in fertilized and non-fertilized plots. The level of linolenic acid did not change significantly in any plots of any treatment combinations; a similar result was observed in the level of oleic acid in most of the genotypes. Nitrogen fertilization increased GSL and SAE levels, whereas fungicidal treatment had no effect. Our findings demonstrated that nitrogen fertilization can markedly influence some quality parameters in oilseed rape; however, the application of fungicides reduced side effects of nitrogen fertilizer and resulted a reduction on GSL, SAE and protein contents but an increase on total oil and oleic acid contents.

Interactive Role of Fungicides and Plant Growth Regulator (Trinexapac) on Seed Yield and Oil Quality of Winter Rapeseed

“…At both stations it was observed that application of only triazole fungicides (Top0.5and Folicur + Proline) reduced oil content in comparison with control and other treatments [6,16]. Our results are contradicted by MertTürk et al (2008) [23] and Butkute et al (2006) [24], who worked with triazole fungicides Harvesan and Folicur, respectively, and reported that oil content of rapeseed increased significantly after triazole application in comparison with the control. Application of Ortiva and Cantus in combination with triazole fungicides enhanced oil content by extending the seed formation phase which led to increased oil accumulation in the seeds.…”

New winter oilseed rape varieties – seed quality and morphological traits depending on sowing date and rate

“…The presence of these compounds in the expeller and the meal of rapeseed limits the use of oil processing residuals in feeding of monogastric animals. It is widely accepted that the glucosinolate content is affected by environmental factors, agronomic practices (Turhan et al, 2011) or nutritional availability (Mert-Turk et al, 2008). Moghadam et al (2011) reported that under drought stress conditions, the average glucosinolate content increased to 15%, for all varieties.…”

“…It is influenced by genetic and environmental factors, as well as agricultural technology (Hu et al, 2007;Krzymański et al, 2009;Mert-Turk et al, 2008). Changes to the growing environment, as influenced by agronomic practice or the climate, are preventing the genetic potential from being realized (Berry & Spink, 2006).…”

The health status and yield of winter rapeseed (Brassica napus L.) grown in monoculture and in crop rotation under different agricultural production systems

“…Bloem et al (2007) reported that rapeseed plants fertilized with sulfur were highly resistant to pathogens. Higher rates of sulfur fertilizer (De Pascale et al 2007) and the use of liquid organic nitrogen instead of mineral fertilizer (Johnson et al 2012) led to higher accumulation of phenolic acids (sinapinic, gallic, p-coumaric acids) in Brassicaceae plants in response to biotic stress, including pathogen infections (Mert-Türk et al 2008;Johangir et al 2009). …”