Impact of soil water content on maize responses to the plant growth-promoting rhizobacterium Azospirillum lipoferum CRT1     

Sonia Czarnes  Pierre-Edouard Mercier  Damien G. Lemoine  Jihane Hamzaoui  Laurent Legendre 《Journal of Agronomy and Crop Science》2020,206(5):505-516

Members of the bacterial genus Azospirillum are root-associated bacteria that increase yield in cereals by promoting growth and alleviating drought stress. How plants integrate the many bacterium-derived growth-promoting stimuli with other environmental factors to generate a coordinated response remains unresolved. Using a commercial Azospirillum strain, A. lipoferum CRT1 and two host maize cultivars, it was observed that bacterization reduced the drought-induced increase in lateral root growth and enhanced the flood-induced increase in lateral root growth in the more drought- and flood-sensitive cultivar. In the other one, A. lipoferum CRT1 only elicited a moderate root growth response under low soil water potential. The photosynthetic potential and activity were increased in the earlier cultivar and decreased in the later one, irrespective of the soil water content. No impact of the bacterium was seen on the growth of the leaves of both cultivars under both stresses until the third leaf stage, therefore suggesting that it is a consequence of multiple primary adaptations to biotic and abiotic stresses. It is suggested that host–bacteria recognition leads to a stress-specific modulation of the root response and a differential stress-independent effect on photosynthesis. This is the first report of the impact of Azospirillum under flood conditions.  相似文献   

Landscape change under indirect effects of human use: the Savanna of Central Chile     

Eduardo R. Fuentes  Reinaldo Avilés  Alejandro Segura 《Landscape Ecology》1989,2(2):73-80

The Chilean Intermediate Depression to the north of Santiago has experienced a physiognomical transformation from a Prosopis chilensis woodland to an Acacia caven savanna. Today P. chilensis trees are scarce and belong mostly to the larger size classes. By contrast A. caven seems to reproduce frequently and its populations consist of individuals of all size classes. In this paper we document these changes and report the results of tests aimed at determining the causes of these physiognomical changes. We found that livestock, leporids, introduced Mediterranean forbs and agriculture account for differences in seed dispersal and survival of A. caven and P. chilensis, which can explain the documented changes in the Chilean landscape.  相似文献   

Analysis of In vitro Fertilizing Capacity to Evaluate the Freezing Procedures of Boar Semen and to Predict the Subsequent Fertility     

E Sellés  J Gadea  R Romar  C Matás  S Ruiz 《Reproduction in domestic animals》2003,38(1):66-72

A porcine in vitro fertilization (IVF) system and seminal quality parameters of frozen–thawed boar semen were used to assess the effectiveness of two different thawing rates of frozen boar semen, and to address the question of whether differences between fertility of ejaculates could be predicted in a limited field trial. In the first experiment, two thawing procedures were analysed (37°C, 30 s; 50°C, 12 s) and no differences in sperm quality were found. However, when the procedure was 50°C, 12 s the IVF results showed a higher number of sperm per penetrated oocyte and a near 10 points higher rate of pronuclear formation. In the second experiment, the fertility results obtained in the limited field trial show to be efficient enough for application in a commercial use, especially for three of the employed boars (fertility ≥80%). In this limited study, the conventional seminal parameters are not accurate enough to discriminate good and bad boars in relation to fertility. On the contrary, parameters of in vitro penetrability are more precise to predict subsequent fertilities. As conclusion, the IVF fertilization system seems to be a good tool to evaluate the quality of frozen–thawed boar semen previous to its commercial way, to verify the bank semen storage quality and a good way to assay new sperm freezing procedures, as it is the more precise evaluating method in estimating the potential fertilizing ability.  相似文献   

Actinobacillus (Haemophilus) pleuropneumoniae Symposium   总被引：1，自引：0，他引：1       下载免费PDF全文

Lynch JA  Larivière S 《The Canadian veterinary journal. La revue veterinaire canadienne》1988,29(7):571

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International development: A new beginning          下载免费PDF全文

Julian D  Mills M  Carrière S  Stevenson B 《The Canadian veterinary journal. La revue veterinaire canadienne》1988,29(12):966-967

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Evaluation of a Killed Vaccine Against Porcine Pleuropneumonia Due to Haemophilus pleuropneumoniae   总被引：20，自引：2，他引：18  

Higgins R  Larivière S  Mittal KR  Martineau GP  Rousseau P  Cameron J 《The Canadian veterinary journal. La revue veterinaire canadienne》1985,26(2):86-89

A bacterin containing serotypes 1 and 5 of Haemophilus pleuropneumoniae was developed for the prevention and the control of porcine pleuropneumonia. It was injected intramuscularly into three groups of ten piglets, the first group with one dose, the second one with two doses and the third one with three doses at two-week intervals. Another group of ten piglets did not receive the vaccine. All the piglets were then challenged by an aerosol of mixed suspensions of H. pleuropneumoniae serotypes 1 and 5. Two and three injections of vaccine completely prevented mortality, whereas half of the control piglets and of those receiving only one dose of vaccine died. All surviving piglets, both control and vaccinated, had severe signs of respiratory disease for at least 36 hours after exposure to challenge. Moreover, vaccination did not induce the production of antibodies at high titers. Local reactions were not noted after vaccination and at postmortem; ten weeks after the challenge, there were no signs of abscess formation or induration.  相似文献   

Paraprotein-induced defective haemostasis in a dog with IgA (kappa-light chain) forming myeloma     

Ruiz De Gopegui R  Espada Y  Vilafranca M  Cuadradas C  Fontcuberta E  Millá F  Roncalés J  Ruzafa A 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》1994,23(3):70-71

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A syndrome of dental abnormalities of sheep: I. Clinical aspects on a commercial sheep farm in the Wairarapa.     

A N Bruère  D M West  M B Orr  M W O'Callaghan 《New Zealand veterinary journal》1979,27(8):152-158

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The significance of the XO syndrome in infertility of the mare.     

M G Blue  A N Bruère  H F Dewes 《New Zealand veterinary journal》1978,26(6):137-141

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Preliminary observations on the occurrence of the equine XO syndrome.     

A N Bruère  M G Blue  P M Jaine  K S Walker  L M Henderson  H M Chapman 《New Zealand veterinary journal》1978,26(6):145-146

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