Rhizobacterial community structure differences among sorghum cultivars in different growth stages and soils

Abstract

Plant genotype selects the rhizosphere microbiome. The success of plant-microbe interactions is dependent on factors that directly or indirectly influence the plant rhizosphere microbial composition. We investigated the rhizosphere bacterial community composition of seven different sorghum cultivars in two different soil types (abandoned (CF) and agricultural (VD)). The rhizosphere bacterial community was evaluated at four different plant growth stages: emergence of the second (day 10) and third leaves (day 20), the transition between the vegetative and reproductive stages (day 35), and the emergence of the last visible leaf (day 50). At early stages (days 10 and 20), the sorghum rhizosphere bacterial community composition was mainly driven by soil type, whereas at late stages (days 35 and 50), the bacterial community composition was also affected by the sorghum genotype. Although this effect of sorghum genotype was small, different sorghum cultivars assembled significantly different bacterial community compositions. In CF soil, the striga-resistant cultivar had significantly higher relative abundances of Acidobacteria GP1, Burkholderia, Cupriavidus (Burkholderiaceae), Acidovorax and Albidiferax (Comamonadaceae) than the other six cultivars. This study is the first to simultaneously investigate the contributions of plant genotype, plant growth stage and soil type in shaping sorghum rhizosphere bacterial community composition.

Under the Christmas Tree: Belowground Bacterial Associations With Abies nordmanniana Across Production Systems and Plant Development

“…The composition of the rhizosphere microbial communities has previously been particularly well studied for annual plants, including several important crop species (Caliz et al, 2015;Schlemper et al, 2017). These studies have revealed the importance of soil characteristics, management, and plant developmental stage on the assembly of the rhizosphere microbiome.…”

Belowground microbial communities respond to water deficit and are shaped by decades of maize hybrid breeding

“…In contrast in our study on maize, water stress did reveal differences in rhizosphere microbial communities in the old and new hybrids under drought conditions, and we speculate that water stress may have led to differential exudation patterns that shaped the microbial communities. Evidence for the effects of differences in exudates on microbial community composition has been previously shown (Schlemper et al ., ; Wang et al ., ). In contrast, we found that the microbiome of the endosphere in older versus newer hybrids was only significantly different under well‐watered conditions.…”

Strigolactone: Pflanzenhormone mit vielversprechenden Eigenschaften

“…[19,20] Weiterhin ist es nicht unwahrscheinlich, dass ihre Signalfunktion in der Rhizosphäre breiter ist als nur an die AM-Pilze gerichtet, was auch erklären kçnnte,w arum Pflanzen so viele verschiedene Strigolactone sekretieren. [22] Obwohl in vielen Untersuchungen versucht wurde,e ine Rolle der Strigolactone bei Interaktionen zwischen Pflanzen und pathogenen Mikroorganismen oder Insekten nachzuweisen, bleibt die Evidenz hierfüre her gering. Außerdem wurden in einer orientierenden Studie an Sorghum-Genotypen, die sich in ihrer Strigolacton-Zusammensetzung in den Wurzelablagerungen unterscheiden, auch Unterschiede in ihrem jeweiligen bakteriellen Mikrobiom entdeckt.…”

“…Eine mçgliche Rolle von Strigolactonen bei der Gestaltung des Wurzelmikrobioms wurde von vielen Gruppen vorgeschlagen, [22,72,73] und die jüngsten Fortschritte bei Sequenzierungstechniken und der Analyse werden mit Sicherheit zu neuen Erkenntnissen in diesem Bereich führen. Eine mçgliche Rolle von Strigolactonen bei der Gestaltung des Wurzelmikrobioms wurde von vielen Gruppen vorgeschlagen, [22,72,73] und die jüngsten Fortschritte bei Sequenzierungstechniken und der Analyse werden mit Sicherheit zu neuen Erkenntnissen in diesem Bereich führen.…”