磷处理对谷子根际微生物及根系形态的影响OA

To clarify the effects of low phosphorus stress on rhizosphere microorganisms and root morphology of millet,three millet va-rieties('Jigu13','Jingu21','Yugu18')were used with low phosphorus(P0)and normal phosphorus(PN)treatments under field condi-tions.The quantities of rhizosphere bacteria,fungi,actinomycetes and root morphological indices were determined at booting stage.The results showed that low phosphorus reduced rhizosphere microorganisms and inhibited root development.'Jingu21'exhibited smaller decreases in microorganisms and maintained higher total root length with stronger low-phosphorus tolerance.'Jigu13'increased root diameter.'Yugu18'showed weaker adaptability.In conclusion,rhizosphere microorganisms and root morphology of millet present a synergistic response pattern to low phosphorus stress,and the low-phosphorus tolerance and adaptation strategies of varieties with dif-ferent phosphorus response characteristics show significant genetic differentiation.'Jingu21'has outstanding comprehensive low-phos-phorus tolerance,which can be used as an excellent germplasm for millet cultivation and low-phosphorus-tolerant breeding in low-phosphorus dry farming areas.