Carbohydrates in individual poplar fine roots: effects of root age and defoliation     

Kosola KR  Dickmann DI  Parry D 《Tree physiology》2002,22(10):741-746

Late-summer starch accumulation in fine roots of poplars (Populus x canadensis Moench.) defoliated by gypsy moth (Lymantria dispar L.) lagged behind that in fine roots of undefoliated trees. If starch concentration declines with age, defoliation-induced changes in root system age structure could be partly responsible for this difference. To test this hypothesis, we measured fine-root starch and soluble sugar concentrations in roots of known age from trees in defoliated and undefoliated plots. There was a significant interaction between the effects of defoliation and root type (white, brown, or dead) on fine root soluble sugar concentration because of the high concentration of soluble sugars in white roots from trees in undefoliated plots. Both root starch and soluble sugar concentrations were variable among individuals of each age class. The population frequency distributions for starch and soluble sugar concentrations were both right-skewed, and fit by exponential functions. These data are most consistent with direct defoliation effects on a labile and dynamic pool of carbohydrates in poplar fine roots, rather than indirect defoliation effects on root system age structure.  相似文献   

Does choice of imaging modality affect outcome in dogs with thoracolumbar spinal conditions?     

A. T. Parry  A. Harris  M. M. Upjohn  K. Chandler  C. R. Lamb 《The Journal of small animal practice》2010,51(6):312-317

Objectives : A retrospective cross-sectional study was done to look for differences in outcome in canine spinal patients that had myelography compared to those that had magnetic resonance imaging. Methods : Medical records of dogs with spinal conditions in the period January 2004 to December 2007 were reviewed. Data on patient age, gender, breed, size, neurolocalisation, rate of onset, imaging modality, time taken to image, type of treatment, neurological grade at admission and discharge, length and cost of hospitalisation and status at discharge were collected. Only dogs with neurological grade 3 to 6 with signs referable to the thoracolumbar spine were included. Results : Of 107 dogs that met the inclusion criteria, 66 (62%) had myelography and 41 (38%) had magnetic resonance imaging. Using multivariable analyses, non-chondrodystrophoid breed, increasing age and higher neurological grade at admission were found to be associated negatively with survival. Neurological grade 5 at admission was found to be associated positively with likelihood of neurological improvement. Male gender, higher neurological grade at admission and medical treatment were associated negatively with length of hospitalisation. magnetic resonance imaging, surgical treatment and period of hospitalisation were associated positively with total cost of hospitalisation. Clinical Significance : No significant association was found between type of imaging and any patient outcome variables except cost of hospitalisation, which was higher for dogs having magnetic resonance imaging. Although magnetic resonance imaging may be considered advantageous compared to myelography because it is non-invasive and provides superior anatomical detail for surgical guidance, no beneficial effect on outcome of dogs with non-ambulatory thoracolumbar spinal disease was found.  相似文献   

Evidence for an Osmotic Mechanism in the Control of Powdery Mildew Disease of Wheat by Foliar-applied Potassium Chloride   总被引：3，自引：0，他引：3  

P.S. Kettlewell  J.W. Cook  D.W. Parry 《European journal of plant pathology / European Foundation for Plant Pathology》2000,106(3):297-300

The mechanism by which foliar application of potassium chloride solution reduces symptoms of powdery mildew disease (Erysiphe graminis f.sp. tritici) of wheat was investigated. The hypothesis that potassium chloride reduces mildew by an osmotic effect on spore germination was tested in three glasshouse experiments. Either potassium chloride solution or the osmoticum polyethylene glycol 200 was sprayed on wheat at the three- or four-leaf stage. The plants were inoculated with spores and spore germination and leaf area affected by mildew were assessed. Leaf water potential was determined as a measure of the osmotic effect of the treatments. Spore germination and leaf area affected by mildew were related to leaf water potential using regression analysis in groups on the data averaged over the three experiments. Both spore germination on the leaf and leaf area affected by mildew were reduced as leaf water potential decreased. There was no difference between potassium chloride or polyethylene glycol in the relationship between spore germination and leaf water potential, but polyethylene glycol was slightly less effective at reducing mildew symptoms at any given leaf water potential. The results are compatible with the hypothesis that potassium chloride reduces symptoms of powdery mildew by an osmotic effect on spore germination.  相似文献   

Changes in factor VIII activity and von Willebrand factor antigen concentration with age in dogs.     

P D Mansell  B W Parry 《The British veterinary journal》1992,148(4):329-337

The factor VIII activity of 38 German shepherd puppies, 6-12 weeks old, submitted for diagnosis of haemophilia A was measured. Eight of these puppies had values higher than would be expected for haemophiliacs, but less than the reference range for adult dogs. A further sequential study of 21 puppies (6-26 weeks of age) indicated that the factor VIII activity of puppies is generally less than that of adult dogs until about 14 weeks of age. Changes in the concentration of von Willebrand factor antigen in the puppies were irregular. These variations are probably not sufficient to interfere with accurate diagnosis of haemophilia A in most affected young dogs, but may interfere with the detection of heterozygotes in young bitches.  相似文献   

Prolate pour-ons for the control of sarcoptic and chorioptic mange in cattle     

D Henderson  D P Stevens  J Parry  G H Yeoman 《The Veterinary record》1987,120(17):418-419

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Presumptive Albendazole Toxicosis in 12 Alpacas     

A. Gruntman  R. Nolen-Walston  N. Parry  R. Wilborn  H. Maxwell 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2009,23(4):945-949

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Effects of Deep Planting on Anchorage and Performance of Apple Trees     

W.S. Rogers  M. S. Parry 《The Journal of Horticultural Science and Biotechnology》2013,88(1):103-106

Trees of Cox’s Orange Pippin budded at 12 inches height on M.VII rootstocks were planted 6 inches deeper than usual and compared over a six-year period with similar trees budded at 6 inches and planted at normal depth, all without staking. The deep-planted trees all remained firmly anchored and required no staking while more than half the controls leaned over. There was a slight temporary check to growth with deep planting, and some reduction in early cropping. Suckering from roots was greatly reduced. The effects of deep planting were influenced by soil variation.  相似文献   

Trials of New Quince Rootstocks for Pears     

M. S. Parry 《The Journal of Horticultural Science and Biotechnology》2013,88(2):281-287

The performance of two pear varieties, Conference and Beurré Hardy, on eleven vigorous and three dwarfing quince rootstocks, was compared with that on Quince A in a field trial lasting 14 years. The rootstocks gave a wide range of control over tree size, from less than 50 % to more than 130 % of that on Quince A. Crop yield per tree was roughly proportional to tree size and there were no marked differences in rootstock efficiency expressed as yield in relation to crown area. The most vigorous rootstock, C84, is considered to be of commercial interest.  相似文献   

Evidence of Clonal Variation and Latent Virus Effect on the Vigour of Cox’s Orange Pippin Apple Trees on M.9 Rootstocks     

M. S. Parry 《The Journal of Horticultural Science and Biotechnology》2013,88(4):439-440

Apple trees on M.9 EMLA rootstocks free from known virus are at least 50% larger than those on M.9a containing latent virus. Evidence is presented that about half of this difference can be attributed to clonal variation and the rest to virus effects.  相似文献   

Precision of a Novel Computed Tomographic Method for Quantification of Femoral Varus in Dogs and an Assessment of the Effect of Femoral Malpositioning     

Bill Oxley MA VetMB CertSAS  Toby J. Gemmill BVSc MVM DSAS Diplomate ECVS  Jonathan Pink BSc BVetMed CertSAS Diplomate ECVS  Stephen Clarke BVM&S DSAS Diplomate ECVS  Andrew Parry MA VetMB CertVDI Diplomate ECVDI  W. Malcolm McKee BVMS MVS MACVSc DSAO 《Veterinary surgery : VS》2013,42(6):751-758

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