MULTIPLE FORMS OF α-AMYLASE IN MALTING BARLEY VAR. EMMA.

Multiple forms of amylase induced by gibberellic acid in isolated barley aleurone layers.

The addition of gibberellic acid to isolated aleurone layers of barley (Hordeum vulgare L.) causes the production and secretion of four alpha-amylases. Two of these are stable at pH 3.7 and are not inactivated by ethylenediaminetetraacetate. The other two represent the classical barley alpha-amylases; i.e., they are inactivated at pH 3.7 and by reagents which from complexes with divalent metal ...

Simulation of yield and quality of malting barley

A computer simulation model was developed to determine the likely response of grain yield and quality of malting barley crops to differing availability of water or nitrogen (N) and differing soil and climatic conditions. The model was validated for New Zealand conditions by comparing the results of model simulations with data from malting barley crops grown in the Manawatu. Simulations were the...

Osmotic Regulation of Α-amylase Synthesis and Polyribosome Formation in Aleurone Cells of Barley

Water stress inhibits the gibberellic acid (GA(3))-induced synthesis of alpha-amylase in aleurone layers of barley (Hordeum vulgare L.). Electron microscope evidence indicates that the effect of water stress induced by 0.6 M solutions of polyethylene glycol (PEG) is to reduce the binding of ribosomes to the endoplasmic reticulum. This was confirmed by sucrose density gradient centrifugation of ...

Evaluation of Malting Barley Potential for Atlantic Canada

Effect of Barley yellow dwarf virus Infection on Yield and Malting Quality of Barley

Barley yellow dwarf (BYD), the most common and widespread virus disease of cereal crops worldwide (14), may be caused by any one of several Barley yellow dwarf viruses (BYDVs) of the family Luteoviridae. Transmitted by at least 25 aphid species (24), these viruses historically have been classified into two subgroups and five strains based on aphid vector specificity and efficiency (31). However...