School of Agriculture, Food and Ecosystem Sciences - Theses

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End date: 2021 × Subject: Eucalyptus × Author: Dempsey, Raymond William ×

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    The role of the antioxidants ascorbate and glutathione, in the plant-pathogen interaction between Phytophthora cinnamomi Rands and susceptible and resistant Eucalyptus species
    Dempsey, Raymond William ( 2013)
    This study investigates the role that the low molecular weight antioxidants, ascorbate and glutathione, play in the plant-pathogen interaction between Eucalyptus spp. and Phytophthora cinnamomi - Rands. The study has shown that plant responses (i.e. antioxidant concentration changes, rates of photosynthesis, stomatal conductance, quantum efficiency of photo-system II and carbohydrate levels) to P. cinnamomi root infection in roots and leaves differ significantly between susceptible and resistant Eucalyptus species. Antioxidant concentration decreases and an increased sensitivity to leaf photoinhibition were associated with infection in susceptible E. sieberi. In contrast, early antioxidant increases were associated with resistant E. sideroxylon.