There are many reported benefits to plants of arbuscular mycorrhizal fungi(AMF),including positive plant biomass responses;however,AMF can also induce biomass depressions in plants,and this response receives little at...There are many reported benefits to plants of arbuscular mycorrhizal fungi(AMF),including positive plant biomass responses;however,AMF can also induce biomass depressions in plants,and this response receives little attention in the literature.Highthroughput phenotyping(HTP)technology permits repeatedmeasures of an individual plant’s aboveground biomass.We examined the effect on AMF inoculation on the shoot biomass of three contrasting plant species:a vegetable crop(tomato),a cereal crop(barley),and a pasture legume(Medicago).We also considered the interaction ofmycorrhizal growth responseswith plant-available soil zinc(Zn)and phosphorus(P)concentrations.The appearance of a depression in shoot biomass due to inoculation with AMF occurred at different times for each plant species;depressions appeared earliest in tomato,then Medicago,and then barley.The usually positive-responding Medicago plants were not responsive at the high level of soil available P used.Mycorrhizal growth responsiveness in all three species was also highly interactive with soil Zn supply;tomato growth responded negatively to AMF inoculation in all soil Zn treatments except the toxic soil Zn treatment,where it responded positively.Our results illustrate how context-dependentmycorrhizal growth responses are and the value of HTP approaches to exploring the complexity of mycorrhizal responses.展开更多
基金The APPF is funded bythe Australian Government under the National Collaborative Research Infrastructure Strategy(NCRIS)S.J.Watts-Williams is supported by the University of Adelaide RamsayFellowship and the Australian Research Council Centre of Excellence in Plant Energy Biology(Grant no.CE140100008).
文摘There are many reported benefits to plants of arbuscular mycorrhizal fungi(AMF),including positive plant biomass responses;however,AMF can also induce biomass depressions in plants,and this response receives little attention in the literature.Highthroughput phenotyping(HTP)technology permits repeatedmeasures of an individual plant’s aboveground biomass.We examined the effect on AMF inoculation on the shoot biomass of three contrasting plant species:a vegetable crop(tomato),a cereal crop(barley),and a pasture legume(Medicago).We also considered the interaction ofmycorrhizal growth responseswith plant-available soil zinc(Zn)and phosphorus(P)concentrations.The appearance of a depression in shoot biomass due to inoculation with AMF occurred at different times for each plant species;depressions appeared earliest in tomato,then Medicago,and then barley.The usually positive-responding Medicago plants were not responsive at the high level of soil available P used.Mycorrhizal growth responsiveness in all three species was also highly interactive with soil Zn supply;tomato growth responded negatively to AMF inoculation in all soil Zn treatments except the toxic soil Zn treatment,where it responded positively.Our results illustrate how context-dependentmycorrhizal growth responses are and the value of HTP approaches to exploring the complexity of mycorrhizal responses.
