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The knowledge of the survival of inoculated beneficial fungal and bacterial strains in the field and the effects of their release on the indigenous microbial communities has been of great interest since the practical use of selected natural or genetically modified microorganisms has been developing. The aim of this study was to monitor, 4 years after plantation into the field site, the effects of Douglas fir (Pseudotsuga menziesii) co-inoculation with the mycorrhiza helper bacterial strain Pseudomonas fluorescens BBc6R8 and/or the fungal strain Laccaria bicolor S238N on seedling growth and on the indigenous bacterial and ectomycorrhizal communities using quantitative and qualitative approaches. The field persistence of the inoculated strains was also monitored. The seedling shoot volume estimate was statistically significantly higher in the fungal inoculated plots in comparison to the non-inoculated plots but no treatment-related changes in the quantitave or qualitative microbial measurements were observed and the inoculated strains could not be detected after 4 years. 相似文献
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川东南马尾松外生菌根苗及其抗铝性研究 总被引:1,自引:0,他引:1
采自西南地区分离的马尾松林常见的土著菌株松乳菇(Lactarius deliciosus 01,03)、彩色豆马勃(Pisolithus tinctorius 715)和模式种双色蜡蘑(Laccaria bicolor S238N)的基质纯培养物及液体纯培养物,分别按混合(Mix=Ld 01 Ld 03 Pt 715 Lb S238N)及单独接种的方式接种1月龄马尾松(Pinus massoniana)幼苗.菌根苗在不同pH土壤及铝胁迫条件下培育3个月后采样分析其生长和养分吸收特性.结果表明:4种接种方式均能有效形成菌根,显著增加幼苗的生物量,促进幼苗对N、P、K的吸收并显著(P<0.05)提高抗铝性;混合接种促进马尾松幼苗生长的效果较单独接种好,并且pH=6.1时,幼苗对K的吸收量最大,铝吸收量最少;pH=4.1时,幼苗对N、P的吸收效果最好,但对K的吸收和对铝的抗性最差. 相似文献
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Aung Zaw Htwe Seinn Moh Moh Kyi Moe Takeo Yamakawa 《Soil Science and Plant Nutrition》2018,64(2):222-229
ABSTRACT Co-inoculation of nitrogen-fixing bacteria with plant growth-promoting bacteria has become more popular than single inoculation of rhizobia or plant-growth-promoting bacteria because of the synergy of these bacteria in increasing soybean yield and nitrogen fixation. This study was conducted to investigate the effects of Bradyrhizobium japonicum SAY3-7 and Streptomyces griseoflavus P4 co-inoculation on plant growth, nodulation, nitrogen fixation, nutrient uptake, and seed yield of the ‘Yezin-6’ soybean cultivar. Nitrogen fixation was measured using the acetylene reduction assay and ureide methods. Uptake of major nutrients [nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mg)] was also measured. This study showed that single inoculation of SAY3-7 significantly increased shoot biomass; nodulation; Relative Ureide Index (RUI %), percent nitrogen derived from N fixation (% Ndfa); N, P, K, Ca, and Mg uptakes; during the later growth stages (R3.5 and R5.5), compared with control. These observations indicate that SAY3-7 is an effective N-fixing bacterium for the plant growth, nodulation, and nitrogen fixation with an ability to compete with native bradyrhizobia. Co-inoculation of SAY3-7 and P4 significantly improved nodule number; nodule dry weight; shoot and root biomass; N fixation; N, P, K, Ca, and Mg uptake; at various growth stages and seed yield in ‘Yezin-6’ soybean cultivar compared with the control, but not the single inoculation treatments. Significant differences in plant growth, nodulation, N fixation, nutrient uptake, and yield between co-inoculation and control, not between single inoculation and control, suggest that there is a synergetic effect due to co-inoculation of SAY3-7 and P4. Therefore, we conclude that Myanmar Bradyrhizobium strain SAY3-7 and P4 will be useful as effective inoculants in biofertilizer production in the future. 相似文献
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S. P. Palaniappan P. Sudhi Sreedhar P. Loganathan J. Thomas 《Biology and Fertility of Soils》1997,25(3):279-284
Interstrain competitiveness is a key factor affecting the performance of rhizobium inoculant. In the present study five native
strains of Bradyrhizobium japonicum, namely SSF 4, SSF 5, SSF 6, SSF 7 and SSF 8, were assessed for their competitiveness in nodulating soybean using serological
methods. The strains were inoculated individually or with the type strain USDA 110 at a 1:1 ratio. Nodule occupancy determined
by immunofluorescence and dot immunoblot assay revealed that under in vitro conditions SSF 8 is more competitive than USDA 110
whereas the others were less competitive. The competitive ability of these strains was also estimated in pot culture in the
field. In red soil both SSF 8 and USDA 110 were equally competitive whereas in black soil SSF 8 competed better than USDA 110
and produced more nodules. In a black soil field trial using a randomized block design, USDA 110 or SSF 8, when inoculated
alone, occupied the majority of the nodules and enhanced nodule dry weight and shoot biomass. SSF 8 was more competitive when
the strains were co-inoculated.
Received: 1 November 1996 相似文献
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Aung Zaw Htwe Seinn Moh Moh Kyi Moe Takeo Yamakawa 《Soil Science and Plant Nutrition》2018,64(4):449-454
Co-inoculation of selected nitrogen-fixing bacteria with plant growth-promoting bacteria is the promising way for the improvement of soybean production through enhancing plant growth, nodulation, and N2 fixation. Therefore, this experiment was conducted to study the effects of co-inoculation of Bradyrhizobium elkanii BLY3-8 with Streptomyces griseoflavus P4 on plant growth, nodulation, N2 fixation, N uptake, and seed yield of Rj4 soybean varieties. Two experiments with completely randomized design and three replicates were done in this study. N2-fixation ability of soybean was evaluated by acetylene reduction activity (ARA) and relative ureide method. In the first experiment, synergetic effect in N2 fixation and nodulation was occurred in co-inoculation treatment (BLY3-8 + P4) in Yezin-3 and Fukuyutaka. Based on these results, co-inoculation effect of BLY3-8 and P4 was assessed on Yezin-3 and Fukuyutaka varieties at three different growth stages, using Futsukaichi soil under natural environmental conditions. This study shows that co-inoculation of BLY3-8 and P4 significantly increased N2 fixation at V6 stage; plant growth, nodulation, N2 fixation, and N uptake at R3.5 stage; and shoot growth, N uptake, and seed yield at R8 stage, in Rj4 soybean varieties compared with the control. Significant difference in plant growth, nodulation, N2 fixation, N uptake, and yield between co-inoculation and control, not between single inoculation and control, suggests that there is a synergetic effect due to co-inoculation of BLY3-8 and P4. 相似文献
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Allfalfa and soybean are the most important leguminous plants in the agricultural system of the semiarid pampas of Argentina. The possible action of phosphate solubilizing bacteria on the leguminous-rhizobia symbiosis was studied since in this region the available phosphorus distribution is not uniform. The strains used were Sinorhizobium meliloti 3DOh13, a good solubilizer of iron and phosphorus for alfalfa, Bradyrhizobium japonicum TIIIB for soybean and two phosphorus-solubilizing strains of Pseudomonas putida (SP21 and SP22) for growth promotion treatments. Modification of shoot and root system dry weights occured in soybean but not in alfalfa in presence of Pseudomonas strains. 相似文献
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