Role of extracellular peroxidase in maize, Zea mays (L.) resistance to the European corn borer, Ostrinia nubilalis (Huebner).
|Title:||Role of extracellular peroxidase in maize, Zea mays (L.) resistance to the European corn borer, Ostrinia nubilalis (Huebner).|
|Authors:||MacIsaac, Susan Marie.|
|Abstract:||A cell wall peroxidase (E.C. 1.11.17) mediates the formation of diferulic acid, (E,E)-$4,4\sp\prime$-dihydroxy-$5,5\sp\prime$-dimethoxy-$3\sp\prime$-bicinnamic acid, through the cross-linking of hemicellulose bound ferulic acid, 3-(4-hydroxy-3-methoxyphenyl)-2-propenoic acid, which increases the mechanical strength of the cell wall and its resistance to insects. It was hypothesized that the level of the cell wall bound peroxidase activity was positively correlated across genotypes with the concentration of cell wall bound diferulic acid concentration and resistance to the European corn borer (ECB), Ostrinia nubilalis Hubner, in field grown maize, Zea mays (L.). Activity of the peroxidase was highest at the base of the whorl leaf and rapidly declined with tissue age. Among genotypes, the activity varied widely with no apparent relationship with either ferulic acid, diferulic acid or consumption rate. These results suggest that while diferulic acid may be an indicator of resistance, cell wall bound peroxidase does not play a regulatory role in its formation. (Abstract shortened by UMI.)|
|Collection||Thèses, 1910 - 2010 // Theses, 1910 - 2010|