Browsing by Author "Paterson, D. R."
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Item Broccoli planting method and planting date study, Spring 1986(1991) Cushman, K. E.; Earhart, David R.; Paterson, D. R.Item Broccoli seeding date and seeded cultivar/breeding line trials, 1985(1987) Cushman, K. E.; Earhart, David R.; Paterson, D. R.Item Chilling injury and chill-hardening in selected tropical foliage plants(1983) Smith, Curtis Walter; McWilliams, E. L.; Joham, H. E.; Paterson, D. R.; Powell, R. D.Chilling susceptibility and symptoms were reported for 31 genera in 18 families, showing widespread sensitivity to chilling injury among foliage plants. Electrolyte leakage was positively correlated (r = 0.97, 0.98) with chilling duration in Scindapsus pictus Hassk., providing a reliable predictor of membrane injury in this species. Electrolyte leakage was not correlated with chilling duration in Maranta leuconeura, E. Morr. var. erythroneura Bunting. Increased concentration of ethane, a by-product of membrane peroxidation, was noted in the internal atmosphere of both species, indicating membrane damage. Increased ethylene concentrations were found in leaves of M. leuconeura, but concentrations were reduced in S. pictus leaves following chilling. Growth of S. pictus, M. leuconeura, and Aphelandra squarrosa was reduced following chilling at 5(DEGREES)C in the dark for 2,4, or 6 days, respectively. Growth of Pilea cadierei was not altered by chilling. Chill-hardening by low-temperature conditioning (15(DEGREES)C) significantly ameliorated the adverse effects of chilling on growth and plant quality in M. leuconeura and S. pictus. Chill-hardening M. leuconeura for 2 days ameliorated the effects of chilling for 4 days at 5(DEGREES)C. Chill-hardening for 9 days effectively ameliorated the effects of chilling for 8 days at 5(DEGREES)C in both species. Measurement of dry wt change demonstrated that chill-hardening alone did not reduce growth in M. leuconeura and S. pictus. Measurement of net CO(,2) exchange in M. leuconeura and S. pictus agreed with dry measurements in three instances: (1) The chill-hardening treatment did not reduce growth; (2) M. leuconeura acclimated to the chill-hardening temperature (15(DEGREES)C) in 9 days; and (3) S. pictus did not acclimate to the chill-hardening temperature (15(DEGREES)C) in 9 days.It is possible that photosynthetic adaptation occurs as a result of, or as a cause of, chill-hardening.Item Chilling injury in okra (Hibiscus esculentus L.) and the relationship of chilling to nitrogen, amino acids, proteins and nucleic acids(1969) Omran, Reffat Gomah; Powell, Robert D; Benedict, C. R.; Blackhurst, H. T.; Morgan, Page W.; Paterson, D. R.The effect of low temperature at two relative humidities on the development of okra plants and changes in total and soluble nitrogen, free amino acids and proteins were studied. The levels of RNA and the rates of RNA and protein synthesis after chilling were also determined. Okra (Hibiscus esculentus L.) variety green velvet, at two growth stages were subjected to three temperature regimes and two levels of relative humidity for 144 hours in controlled growth rooms, and returned to the greenhouse after treatments. The treated plants were graded for the severity of injury. All plants treated at 5° were injured and the young plants died after 6 days. Injury to the older plants included a terminal "die back" which became more apparent with subsequent growth. Regrowth originated from the lower part of the stems. At 10°, less damage was observed in plants at both stages than was evident at 5°. Chilled plants showed a decline in the number of flowers when compared to plants treated at 25°. ...Item Climatological data for East Texas(1987) Cushman, K. E.; Earhart, David R.; Paterson, D. R.Item Cordner sweet potato(1985) Earhart, David R.; Fuqua, M. C.; Motes, J. E.; Paterson, D. R.Item Effect of glomus fasciculatum inoculation, water stress and mineral nutrition on growth, storage root initiation and percent infection of topaz sweet potato(1987) Cushman, K. E.; Earhart, David R.; Paterson, D. R.Item The effect of intra-arterial hydrogen peroxide on the healing of standardized ischemic lesions in rabbits(1969) Prejean, Joe David; Krise, George M.; Brown, Sidney O.; Camp, Bennie J.; Crookshank, H. R.; Paterson, D. R.; Taber, Willard A.The effect of the intra-arterial infusion of dilute hydrogen peroxide on the healing rates of ischemic lesions was investigated based on the proposal that an increased healing rate could be achieved through the alleviation of regional tissue anoxia by super-oxygenation. Standardized ischemic lesions were placed on the lateral portion of each hind leg of 30 New Zealand albino rabbits. One of the legs on each rabbit was infused with a dilute solution of hydrogen peroxide once a day for seven days. The other leg served as the control. The alterations in the healing rates were evaluated ont eh basis of the following criteria: (1) changes in the wound area of the infused and control lesions on days four and eight, (2) histological changes in the control and infused lesions on day eight, (3) differences in hydroxyproline content of the infused and control lesions on day eight, and (4) differences in the mitotic rates of the proliferating epithelium of the infused and control lesions on day eight through the use of autoradiography. ...Item Effects of various growth regulating substances on fruit set and parthenocarpy in the eggplant Solanum melongena L. and the pepper Capsicum frutescens Bailey(1965) Abd El-Maguid, Ahmed Abd El-Gany; Blackhurst, H. T.; Burns, E. E.; Collier, J. W.; Langston, Ruble; Paterson, D. R.Item Ethnic and sex variables in community junior college students' counselor preferencesGilsdorf, Dale L'Heureux; Burns, E. E.; Blackhurst, H. T.; Hacskaylo, Joseph; McLain, Donald D.; Paterson, D. R.The purpose of this inquiry was to determine if community junior college students of various ethnicities (Mexican American, Black, and White) and both sexes differed in their mean preference for counselors of these same ethnicities and both sexes. The investigation was conducted during the Spring semester of 1974 at McLennan Community College in Waco, Texas. Subjects for the study were 120 randomly chosen students from a population of 2,380: 80% White, 9.2% Black, 6.1% Mexican American, and 4.7% other. The sample was stratified by ethnicity and sex and consisted of 20 males and 20 females from each of the three ethnic groups. Participation rate of invited students was 76%. To ascertain student counselor preference, as it related to counselor race and sex, an instrument was developed consisting of twelve 35 mm slides that depicted persons designated as counselors. Groups of 16 student judges for each race, divided equally by sex, evaluated photographed counselors as to racial and sexual representativeness and on ten dimensions of perceived personality. All slides received substantial inter-judge agreement. Twelve slides (two for each race and sex) were selected as representative and equivalent. Slides were arranged by modified pair comparisons into eight sets (three slides to a set) with the sequence of sets, the race and sex, and the ordering, from left to right, of all slides being randomly determined. Subjects viewed each set of slides for 20 seconds, assumed they had a personal problem, and selected one counselor for each set. Comparisons of mean differences between groups were made by a series of one- and two-way analyses of variance with evidenced differences being analyzed by Scheffe's test. The .05 level was required for statistical significance. ...Item Growing Vegetables Transplants.(Texas Agricultural Extension Service, 1959) Mohr, H. C.; Singletary, Clyde; Harrison, A. L.; Paterson, D. R.Item Improve Texas Vegetables -- Sweet Potatoes.(Texas Agricultural Extension Service, 1967) Speights, Durwood E.; Larsen, J. E.; Paterson, D. R.Item Increased production of fall transplanted broccoli by the use of soil solarization(1987) Cushman, K. E.; Earhart, David R.; Paterson, D. R.Item Influence of nitrogen and calcium on cooking quality and mineral content of Xanthosoma sagittaefolium(1970) Van Dijk, Albert Heinrich; Blackhurst, H. T.; DeWerth, A. F.; Paterson, D. R.; Perry, Bruce A.; Watkins, G. W.Studies were made on the effect of 4 calcium and 4 nitrogen levels on cooking quality and mineral content of Xanthosoma sagittaefolium. Three factors were associated with cooking quality, namely cooking time, toughness and crude fiber content of the leaves. Leaves of plants grown at the 4 calcium and 4 nitrogen levels were tested for 16 minerals. Two separate experiments were conducted in the greenhouse, one for calcium and one for nitrogen. Plants were grown in fine gravel and watered daily with the respective nutrient solutions. The 4 calcium levels were 40, 80, 150 and 250 ppm. Nitrogen was tested at levels of 56, 100, 200 and 300 ppm. Results indicated no effect of either calcium or nitrogen on cooking time. Calcium had a small effect on the toughness of Xanthsoma sagittaefolium leaves. Nitrogen had no measurable effect on toughness of the leaves. Both calcium and nitrogen had a significant effect on crude fiber content. The percentage of crude fiber in the leaves was increased with increasing amounts of calcium and nitrogen in the nutrient solution. No relation could be established between the amount of crude fiber, toughness and cooking time. Calcium levels in the nutrient solution had a significant effect on the amount of nitrogen, potassium, barium, strontium, and manganese in the leaves. Nitrogen levels in the nutrient solution significantly affected the concentration of nitrogen, potassium, magnesium, silicon, iron, strontium, boron and zinc in the leaves.Item The influence of the plant parasitic nematode Helicotylenchus dihystera (Cobb) on the growth and nitrogen fixation in the Southern Pea Vigna sinensis (L) Endl(1971) Brown, Oswald David Robert; Blackhurst, H. T.; Thames, W. H.; Paterson, D. R.; Storey, J. B.; Rosberg, David W.The investigation was carried out to explore the possibility of an interaction between the plant parasitic nematode Helicotylenchus dihystera (Cobb) and the Cowpea strain of Rhizobium, in or on the roots of the Southern Pea Vigna sinensis (L) Endl. Experiments were carried out in the greenhouse using the variety Knuckle Purple Hull, field collected nematodes, and the American Type Culture strain of Rhizobium No. 9931. Seed germinating in sand in the absence of nitrogen were exposed to three levels of Rhizobium and three levels of nematodes in all possible combinations for periods of 13 to 50 days. The levels of Rhizobium used resulted in an increase in all parameters measured (fresh weight, dry weight, nodule weight and total nitrogen content) except in regard to fresh weight in one 13-day and one 22-day experiment and for dry weight in one 13-day experiment. The F-test for the nematode component was significant only in the 13- and 33-day experiments. The nematodes consistently increased nodule weight over a 13-day experimentation time. The nematode component reduced significantly the fresh weight in two of the 33-day experiments. Dry weight and nodule weight were also reduced in some instances. On the whole the nematodes had no significant effect on the total nitrogen content of the plants except in one 13- and one 33- day experiment where a significant increase was recorded. In the 33-day experiments there was good evidence for an interaction between the nematodes and the Rhizobium, in regard to both fresh and nodule weights. It is speculated that the southern pea has a differential susceptibility to attack by nematodes which varies with the physiological age of the plant.Item Mulching effects on soil temperature, weed control, growth, and survival of rose varieties(1979) Earhart, David R.; Fuqua, M. C.; Paterson, D. R.; Walker, D. W.Item Mycorrhizae beneficial soil fungi(1983) Earhart, David R.; Paterson, D. R.; Pemberton, H. B.; Roberson, W. E.; Rowland, G. A.Item The nature of reduced fecundity, male sterility and some morphological differences in a strain of watermelon (Citrullus vulgaris schrad.)(1967) Fuqua, Mack Charles; Blackhurst, H. T.; Langston, Ruble; Paterson, D. R.; Smith, James D.Item An overview of rose research at Overton 1985(1985) Davies, Jr., F. T.; Haby, Vincent A.; Paterson, D. R.; Pemberton, H. B.Item Postharvest induced changes in sweet potato quality(1981) Wagner, Alfred Bernhard; Burns, E. E.; Dill, C. W.; Miller, J. C.; Paterson, D. R.; Russell. L. H.The effects of storage systems on sweet potato quality were studied. A double-walled plastic greenhouse-like structure with outside air exchange proved to be a very good alternative to large, expensive commerical storage complexes. There were no significant differences noted for intercellular space or specific gravity due to storage treatment. These are important indicators of storage loss. No significant differences were noted for Gardner "L", "a" and "b" color values, ascorbic acid and carotene in the stored sweet potatoes. The protein content of the commercially stored potatoes was significantly lower than those stored in the greenhouse-type structure. Total sugars increased in storage while total starch decreased. The potatoes stored near the top in the greenhouse-like structure exhibited a lower total sugar content. In the canned samples there was a significant loss of firmness throughout the storage period. No differences in firmness were noted between treatments. After canning, there were significant losses in Gardner "L" (lightness) color, "a" (redness) color, ascorbic acid, and protein. Increases were noted for the total solids, "b" (yellowness) color, total sugar, total starch and soluble solids. Sensory panelists preferred the color of sweet potatoes stored in the bottom layer of the greenhouse. No differences were noted for other sensory qualities.