Contrasting plant growth performance of invasive polyploid and native diploid Prosopis is mediated by the soil bacterial community

Abstract

AbstractBackgroundSoil microbial communities affect above-ground plant diversity and community composition by influencing plant growth performance. Several studies have tested the effect of soil bacterial microbiome on growth performance of native and invasive plants, but the influence of specific bacterial isolates has not been investigated. Here, we investigated the effects of soil bacterial exclusion by soil sterilization and by inoculation ofStreptomycesrhizobacterial isolates on the growth performance of native and invasiveProsopiscongeners.ResultsPlant growth performance of invasiveP. juliflorawas significantly reduced when grown in sterilized soils, whereas nativeP. cinerariashowed enhanced growth performance in the sterilized soils. When grown in the soil inoculated with the specificStreptomycesisolate fromP. juliflora(PJ1), the growth performance of invasiveP. juliflorawas significantly enhanced while that of nativeP. cinerariaseedlings was significantly reduced. However, inoculation ofP. cinerariaandP. julifloraseedlings withStreptomycesisolate from the rhizosphere of nativeP. cineraria(PC1) had no significant effect on the growth performances either ofP. julifloraorP. cineraria.ConclusionOur study reveals that invasive P. juliflora experiences positive feedback from the non-native soil bacterial community, while the native P. cineraria experiences negative feedback from its soil bacterial community. Our results provide fresh experimental evidence for the enemy release hypothesis, and further our understanding of the contrasting growth-promoting effects of differentially recruited microbial species belonging to the same genus (Streptomyces) in the rhizospheres of alien invasive and native plants.