Bacillus subtilis α-amylase was used to hydrolyze
starch from peeled and whole potatoes (Solanum tuberosum).
Effect of gelatinization temperature, pH, enzyme concentration,
temperature of hydrolysis and presence of calcium
ions were investigated. Optimum conditions for hydrolysis
were when α-amylase levels were 0.3 percent of the starch
concentration in the presence...
In the Pacific Northwest (PNW), the two most common root-knot nematodes are Meloidogyne hapla and Meloidogyne chitwoodi. These nematodes can infect a wide variety of crops and can cause significant losses. Currently, it is common for the field of nematology to use labor-intensive microscopy to identify plant-parasitic nematodes based on...
Late blight, caused by Phytophthora infestans, is a devastating problem to potato production in many parts of the world. While the foliar phases of this disease are well characterized, tuber infection, leading to quality losses and disease perpetuation, is less well understood. Experiments were conducted during 1998 and 1999 in...
Potato Virus Y (PVY) imposes serious limitations on potato yield, quality and tuber seed
production. Traditional PVY screening requires artificial inoculation under controlled
conditions followed by ELISA to test for PVY. This method is very tedious and time
consuming thus prohibiting the screening of large segregating populations. The genes
RYadg...
The innate ability of potato leaf tissue to initiate freezing
was studied. Two potato species, the non-hardy cultivated potato
Solanum tuberosum L. cv. Russet Burbank, and Solanum acaule Bitt. a
hardy species from South America, were studied. Two treatments,
low (cold) and high (warm) temperatures were included to study the...
Population size of Clavibacter michiganensis subsp.
sepedonicus in potato cv Russet Burbank and plant response
as affected by drought were assessed in a greenhouse
experiment. Water deficit stress and no stress treatments,
and inoculum densities of 0 or 2 X 10⁷ cfu C. m.
sepedonicus/seed piece were arranged factorially. Stem...
Field plots of cv. Russet Burbank potatoes from a
single seedlot were established at four sites over two
seasons (1985-86) in two locations in Oregon to determine
the role of water-borne inoculum of Erwinia carotovora in
plant infection. One site at each location was irrigated
from a surface-water source and...
Activity of polyphenol oxidase, concentration of 3, 4-
dihydroxyphenylethylamine (dopamine), and concentration of ascorbic
acid in the pulp of bananas as they ripened were measured and relationships
between these factors and both the extent of browning and the
susceptibility to discoloration of the fruit during a 30-minute holding
period were...
The purpose of this study was to evaluate differences between winter wheat varieties in response to nitrogen fertilizer. Seven nitrogen fertilizer rate x variety factorial experiments were conducted in several environments. Dry matter and nitrogen yields at boot, soft dough, and harvest and grain yield components were measured. The yield...
