Quality, morphology and storability of canola and rapeseed harvested after overwintering in Northern Alberta

Abstract

Samples of canola and rapeseed harvested after overwintering in Northern Alberta were compared to samples of fall-harvested seed from the same area. Springharvested seed had a weathered appearance due to changes in theepidermis and received lower grades than the unweathered fall-harvested seed. Spring-harvested seed had more oil and protein than fall-harvested seed, but also had higher free fatty acid content and conductivity and lower viability. Spring-harvested seed did not store as well as fall-harvested seed, having larger increases in free fatty acids, conductivity and storagefungi and larger decreases in viability when stored hermetically at 10% or 12.5% moisture.

Relationships Between Fungal Contamination and Some Physicochemical Properties of Rapeseeds

“…In our study, fat acidity varied between 0.21 and 2.88%. Similar results was found by Daun et al (1986) -fat acidity oscillated between 0.1 and 1.8%. More often than not to isolate fungi from rapeseed one medium and one incubation temperature were used, like Martin's medium (Korniłowicz-Kowalska et al, 2000) or PDA (Brazauskienė et al, 2006).…”

“…Their study proved that moisture of rapeseed was located between 6.98 and 7.70% and fat content inside 42.2−42.43%. Results obtained by Daun et al (1986) indicated that oil content of rapeseed varied between 39.5 and 46%. In our study, fat acidity varied between 0.21 and 2.88%.…”

“…In the specialist literature, one can most often found works on determination of impact of diverse factors on seeds' feature, among other things on of thousand seed weights, volumetric weight, possibilities and energy of sprouting, humidity, porosity and other physical and mechanical seed properties (Razawi et al, 2009;Calisir et al, 2005;Daun et al, 1986;Kachel et al, 2005;Skiba et al, 2005;Kachel-Jakubowska, Szpryngiel, 2006;Sathya et al, 2006;Szwed, A., Szwed, G., 2006;Gawrysiak-Witulska et al, 2007) as well as impact of a conditions and time of storage on seed quality (Cassels et al, 2003;Song et al, 2004). Other publications relate only to quantitative and qualitative analyses of fungi inhabiting the rapeseeds (Mills, Abramson, 1986;Brazauskienė et al, 2006) and changes that occur in rapeseed mycobiota during their storage (Bielecka et al, 1995;Korniłowicz-Kowalska et al, 2000).…”

Colour of rapeseed (Brassica napus) surface and contamination by fungi during storage of dry and wet seeds

“…The following changes in seed contamination by fungi occur during storage, depending on the moisture of seeds, temperature and time of storage and also on pressure in the silos (Mills & Sinha, 1980; Daun et al. , 1986; Korniłłowicz‐Kowalska et al.…”

“…The following changes in seed contamination by fungi occur during storage, depending on the moisture of seeds, temperature and time of storage and also on pressure in the silos (Mills & Sinha, 1980;Daun et al, 1986;Korniłłowicz-Kowalska et al, 2000;Brazauskien_ e et al, 2006). For example, after simulated industry storage of dry samples (94% DM) at 20°C for 50 days under 300 kPa pressure, the number of colony-forming units (CFUs) did not change but the number of species decreased to 93 (mainly Acremonium strictum, Penicillium citrinum, Penicillium digitatum and Penicillium expansum) (Korniłłowicz-Kowalska et al, 2000).…”