ABSTRACT

The effect of a soil thermophilic bacteria (STB), Ureibacillus sp. 18UE/10 on the status of wheat plants was evaluated. A greenhouse assay was performed, mimicking scenarios of soil impoverishment and aridity, which included Rhizophagus irregularis, a crop enhancer AMF, for effect comparison. Treatments with strain 18, R. irregularis or both had no significant effect on biomass production, however affected plant physiology. A different partition in biomass, nitrogen and carbon content were observed, resulting in a decreased C/N ratio. Elemental analysis showed an increase in N and P content in shoots, and for treatments containing STB a decrease in the content of several toxic metals. Strain 18 had a distinct δ¹³C isotopic signature translating an increased stomatal conductance. ATR-IR spectroscopy revealed that root exudate influenced STB cell wall structure and increased the bacterial survival rate at 25°C. These findings show that STB can interact with a plant partner under rhizospheric conditions.

摘要

土壤嗜热细菌（STB），尿杆菌属的影响。评价了18UE / 10关于小麦植株的状况。进行了温室分析，模拟了土壤贫瘠和干旱的情况，其中包括作物增效剂AMF不规则根瘤菌，以进行效果比较。用菌株18，不规则红球菌或二者处理对生物量的生产没有显着影响，但是影响了植物生理。观察到生物量，氮和碳含量的不同分配，导致降低的C / N比。元素分析表明，芽中N和P含量增加，而对于含STB的处理，几种有毒金属的含量减少。应变18具有独特的δ ¹³C同位素标记可提高气孔导度。ATR-IR光谱显示，根系分泌物影响STB细胞壁结构，并提高了25°C时的细菌存活率。这些发现表明机顶盒可以在根际条件下与植物伴侣相互作用。