Effects of AMF on Morphological Index and Photosynthetic Physiology of Bidens pilosa and B.biternata under Different Phosphorus Levels
A pot experiment was conducted to investigate the effects of arbuscular mycorrhizal fungi control(CK).The results showed that AMF could infect both plants mentioned above,and the infection rate and spore density of AMF on B.pilosa were significantly higher than those on B.biternata.Ata phosphorus level of 50 mg/kg,B.pilosa had the highest infection rate and spore density.Inoculation of AMF at 0 and 50 mg/kg phosphorus concentration could significantly promote the absorption of phosphorus by both plants,while the absorption of nitrogen decreased.It also had a certain promoting effect on the plant height,leaf area,total biomass,number of branches,and root crown ratio of both plants.At a phosphorus level of 50 mg/kg,compared with CK,the total chlorophyll content,chlorophyll a/b,maximum fluorescence,maximum photochemical quantum yield of PS Ⅱ,and photosynthetic performance index of B.pilosa and B.biternata inoculated with AMF increased by 22.1%—22.9%,8.4%—11.5%,15.5%—23.8%,11.4%—14.4%,and 17.9%—25.9%,respectively.The net photosynthetic rate,stomatal conductance,and transpiration rate increased by 8.1%—17.7%,18.4%—18.7%,and 12.6%—14.9%,respectively,while the intercellular CO2 concentration decreased by 9.4%—14.7%.The activities of superoxide dismutase,catalase,and peroxidase treated with AMF were significantly higher than those of CK,with increases of 17.2%—19.3%,37.4%—46.4%,and 24.1%—32.1%,respectively.The contents of soluble sugar and soluble protein in osmotic regulators were increased by 45.6%—59.8%and 33.3%—45.1%,respectively.In summary,AMF can promote the growth of B.pilosa and B.biternata under low phosphorus levels(0,50 mg/kg),and the mycorrhizal effect of B.pilosa is higher than that of B.biternata,while the high phosphorus level(200 mg/kg)has a certain inhibitory effect on the growth of the two plants,which is likely to have a certain effect on the successful invasion of B.pilosa in a low phosphorus environment.
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