Short-term measurements of uptake of nitrogen fixed in the rhizospheres of sorghum (Sorghum bicolor) and millet (Pennisetum americanum)     

K. E. Giller  S. P. Wani  J. M. Day  P. J. Dart 《Biology and Fertility of Soils》1988,7(1):11-15

Summary In a series of short-term experiments root systems of young sorghum and millet plants inoculated with N₂-fixing bacteria were exposed to ¹⁵N₂-enriched atmospheres for 72 h. The plants were grown in a normal atmosphere for up to 22 days after the end of the exposure to allow them to take up the fixed N₂. Environmental conditions and genotypes of sorghum and millet were selected to maximise N₂-fixation in the rhizosphere. Detectable amounts of fixed N (> 16 g/plant) were rapidly incorporated into sorghum plants grown in a sand/farmyard manure medium, but measurable fixation was found on only one occasion in plants grown in soil. N₂ fixation was detectable in some experiments with soil-grown millet plants but the amounts were small (2–4 g/plant) and represented less than 1 % of plant N accumulated over the same period. In many cases there was no detectable ¹⁵N₂ incorporation despite measurable increases in ethylene concentration found during an acetylene reduction assay.Published as ICRISAT Journal Article No. JA 740  相似文献   

A comparison of nitrogen fixation in genotypes of groundnut (Arachis hypogaea L.) using 15N-isotope dilution   总被引：2，自引：0，他引：2  

K. E. Giller  P. T. C. Nambiar  B. Srinivasa Rao  P. J. Dart  J. M. Day 《Biology and Fertility of Soils》1987,5(1):23-25

Summary Nitrogen fixation in seven groundnut genotypes was measured by ¹⁵N-isotope dilution using a non-nodulating cultivar of groundnut as the nonfixing reference plant. Nitrogen fixation varied between 100 kg N ha^–1 in genotype J-11 and 153 kg N ha^–1 in Robut 33-1. The amount of plant-available soil N was small, so that 86%–92% of plant nitrogen was derived from N₂-fixation. Thus differences in N₂-fixation between genotypes closely reflected differences in their total N accumulation.ICRISAT Journal Article no. 600  相似文献   

Counting Cicer-Rhizobium using a plant infection technique     

B. Toomsan  O.P. Rupela  S. Mittal  P.J. Dart  K.W. Clark 《Soil biology & biochemistry》1984,16(5):503-507

Chickpea (Cicer arietinum L.), a large seeded pulse legume, is nodulated only by a very specific group of Rhizobium strains which do not nodulate plants other than Cicer spp. If the cotyledons are removed just after germination, subsequent seedling growth is dwarfed, and plants will reliably grow and nodulate in large test tubes (25 × 200 mm) under axenic conditions with either sand or sand + venniculite as the root medium. The dwarfed seedlings of some selected chickpea lines can be used as a “trap host” for counting Cicer-Rhizobium in pure cultures and contaminated materials by a most probable number, serial dilution-plant infection technique. The value of such a plantlet as a “trap host” for studying Cicer-Rhizobium ecology, strain authentication and inoculum quality control is demonstrated.  相似文献   

Genetics of nonnodulation in groundnut (Arachis hypogaea L.). Studies with single and mixed Rhizobium strains     

S. N. Nigam  P. T. C. Nambiar  S. L. Dwivedi  R. W. Gibbons  P. J. Dart 《Euphytica》1982,31(3):691-693

Summary Genetic studies of nonnodulation in groundnut were carried out in a cross, NC 17×PI 259747, with a single Rhizobium strain, NC 92, and a native Rhizobium population.The normal nodulation of the parents, F₁ generations and backcross progenies, and the F₂ segregation for nodulation and nonnodulation confirmed that nonnodulation in groundnut is controlled by two duplicate recessive genes.Approved ICRISAT Journal Article No. 211.  相似文献   

A preliminary study on the effect of manuka honey on second-intention healing of contaminated wounds on the distal aspect of the forelimbs of horses     

Bischofberger AS  Dart CM  Perkins NR  Dart AJ 《Veterinary surgery : VS》2011,40(7):898-902

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Peritonitis in the horse: A treatment dilemma     

A. J. Dart  A. S. Bischofberger 《Equine Veterinary Education》2011,23(6):294-295

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Resection and anastomosis of the small colon in four horses     

AJ DART  JR SNYDER  JR PASCOE 《Australian veterinary journal》1992,69(1):5-7

Resection and anastomosis of the small colon was performed on 4 horses with vascular lesions (strangulating lipoma, mesenteric tear, dissecting haematoma) or functional obstruction (stricture) of this area of the bowel. The anastomoses were performed using a variety of suture materials in 2 layers. An appositional, full-thickness, simple, interrupted pattern was used in the first layer in all cases and oversewn with either a Cushing pattern (3 cases) or a Utrecht pattern (1 case). Post-operative complications associated with suture material and surgical technique were not seen. All horses were discharged from the hospital and all were alive more than one year after discharge.  相似文献   

Comparison of immunogenicity and virulence between Babesia bigemina parasites from continuous culture and from a splenectomised calf   总被引：1，自引：0，他引：1  

WK. JORGENSEN  AJ. DE. VOS  RJ. DALGLIESH † 《Australian veterinary journal》1989,66(11):371-372

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Pathogenicity for sheep of recent Australian bluetongue virus isolates     

AJ FORMAN  PT HOOPER  PM LE BLANC SMITH 《Australian veterinary journal》1989,66(8):261-262

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A survey of cattle producers in the Boophilus microplus endemic area of Queensland to determine attitudes to the control of and vaccination against tick fever     

RE BOCK  GW BLIGHT†  TG KINGSTON  AJ de  VOS 《Australian veterinary journal》1995,72(3):88-92

SUMMARY: A survey by mail was used to determine the views of beef producers in the Boophilus microplus endemic area of Queensland on the control of and vaccination against tick fever. Data from 448 questionnaires were analysed, representing 2.7% of beef producers in the survey area. Producers considered buffalo fly ( Haematobia irritans exigua ) infestation as the most important problem whereas tick fever ranked sixth overall. Private veterinarians were regarded as the most important source of information on vaccines for cattle followed by a weekly rural newspaper. From the survey we estimate that about 33% of producers used the tick fever vaccine produced by the Tick Fever Research Centre of Queensland Department of Primary Industries but there were significant (P < 0.05) variations between regions and herds. Large herds (≥ 400 head) in south-east Queensland were the most likely to be vaccinated against tick fever. Of the producers who did not use the vaccine, over 70% replied that there was no need to vaccinate because of the low risk of the disease in their herds. In 52% of unvaccinated herds the treatment of animals with acaricide was considered the most important means of tick fever control and 61% of these herds comprised Bos indicus x Bos taurus or Bos indicus cattle.  相似文献