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Dr.
John K. Fellman
.jpg) 509-335-3454
fellman@wsu.edu
Professor
of Postharvest Physiology, Horticulture. Ph.D. 1982, University
of Idaho.
Research
We
are using novel chemical indicators (nitrone spin traps) to react
with apple skin in order to determine if there is a relationship
between chemical indication and superficial scald severity(an economically
devastating disorder) after storage. We are testing a hypothesis
involving farnesylation of signaling molecules potentially moderating
the cell-death response of scalded tissues. We want to determine
if the accumulation of chemicals that react to the indicator are
related to development of scald symptoms; and further examine the
role of active oxygen species in controlling plant responses to
the environment. In an experiment with forest trees, we noted a
reaction inr on experimental UV-B treated needles and leaves in
the presence of the nitrone. Other research activities in our group
investigate: the “flavor regeneration “ phenomenon
in apples removed from controlled-atmosphere storage. Following periods
of low level metabolic activity brought about by CA storage conditions,
enzymes and metabolites must be regenerated so the apple can resume production
of metabolites including alcohol acetyltransferase and substrates for volatile
synthesis; developing robust methods to profile flavor volatiles and phenolics
in grape berries and wines produced in Washington, a relatively new growing region;
determine heritability of principal flavor and odor-active components with
sensory impact present in raspberries from selected crosses, and
ascertain the relationship between flavor compound content/sensory impact to
facilitate studies concerning the effects of genotype, cultural practices, maturity
and postharvest handling on flavor perception in raspberries.
Selected
Publications
Fellman, J.K.,
Rudell, D.R., Mattinson, D.S. and Mattheis, J.P. 2003. Relationship
of Harvest Maturity to Flavor Regeneration After CA Storage of ‘Delicious’ Apples.
Postharvest Biol. Technol. 27:39-51.
Warren, J.M., Bassman, J.H., Fellman, J.K., Eigenbrode, S.D. and
Mattinson, D.S. 2003. UV-B Radiation Alters Phenolic Profiles in
Populus trichocarpa, with Implications for Chrysomelid Herbivory.
Tree Physiology 23:527-536.
Moore, P.P., Burrows, C., Fellman, J. and Mattinson, D.S. 2002.
Genotype X Environment Variation in Raspberry Fruit Aroma Volatiles.
Acta Hort. 585:511-516
Rudell, D.R.,
Mattinson, D.S., Wyllie, S.G. and Fellman, J.K. 2002. Investigations
of Aroma Volatile Biosynthesis Under Anoxic Conditions and in
Different Tissues of ‘Redchief Delicious’ Apple
Fruit (Malus domestica Borkh.). J. Agr. Food Chem. 50:2627-2632.*
Fellman, J.K., Miller, T.W., Mattinson, D.S. and Mattheis, J.P.
2000. Factors that Influence Biosynthesis of Volatile Flavor Compounds
in Apple Fruits. HortScience 35:1026-1033.
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