The impact of cold temperatures during grain maturation on selected quality parameters of wheat

Abstract

The influence of sudden cold spells during grain filling of wheat on the quality traits of three South African hard red wheat cultivars (Gariep, Elands and Tugela-DN) was studied, with the emphasis on Hagberg falling number (HFN). Four treatments were used (−1• C at soft dough stage, −1 • C at late milk stage, −4 • C at soft dough stage and −4• C at late milk stage) and were administered for one night only. From the results it was concluded that, although limited in duration, such frost conditions did have an effect on the quality of the wheat cultivars. Cultivars differed in their response to the various treatments but also as to what quality traits were affected the most. The −4• C at late milk stage resulted in significantly reduced HFN being measured for both Elands and Tugela-DN. A similar effect was observed for Gariep, but was not statistically significant. Although the response was limited to the main tillers only, the conclusion was made that it is probable that the reduced HFN would be visible in the pooled sample of head and side tillers. A screening protocol was suggested that would allow classification of cultivars for frost tolerance.

Reduced Height (Rht) Alleles Affect Wheat Grain Quality

“…Grain quality characters assessed included: mean grain weight and specific (or test-) weight as crude indicators of milling performance [ 18 – 19 ]; Hagberg falling number as an assessment of alpha -amylase activity [ 20 – 21 ] which if present at excessive levels can impede loaf manufacture and quality [ 19 ]; concentrations of nitrogen and sulphur because of their influence on loaf quality [ 19 , 22 – 23 ]; and SDS-sedimentation volume tests [ 24 ] as a small-scale assessment of baking potential that is reliant on glutenin subunits [ 25 – 26 ] and disulphide bonds [ 27 ].…”

Effect of Grain Protein Concentration on Falling Number of Ungerminated Soft White Winter Wheat

“…Most studies of the impact of growth environment on FN results have understandably focused on the environmental induction of AA synthesis from either germination (Biddulph et al 2008) or LMAA (Craven et al 2007a). Mares and Mrva (2008) reviewed LMAA and described the requirement for susceptible genotypes and the strong influence of environment on LMAA expression, notably a cool temperature shock 25-30 days postanthesis.…”

Variation in cold tolerance in F6durum wheat [Triticum turgidum(L.) Tell. convar.durum(Desf.) Mackey] RILs and the relationships of cold tolerance with some quality parameters and genetic markers

“…The low temperature negatively influences the traits OK, YP, wet-TKW and dry-TKW in the current study as in previous studies, a significant positive correlation between winter resistance and grain yield (Ruzgas and Liutkevičius, 2001) and influence of low temperature on starch damage and gliadin : glutenin ratios (Craven et al ., 2007) reported. Mohammadi et al .…”