健康与罹病玉米根际微生物数量及真菌区系研究

Rhizosphere Microorganism Quantity,Fungal Flora of Healthy and Infected Corn Plants by F.oxysporum.

对玉米茎基腐病植株根际微生物数量及真菌区系的研究结果表明,健康与罹病玉米植株根际微生物数量存在明显差异,其中罹病玉米植株根际真菌、细菌数量明显高于健康玉米植株,而健康与罹病玉米植株放线菌数量无明显差异。健康玉米植株根系真菌种类为8种,常见真菌3～4种,优势种的菌落数占总菌落数的28.9%～53.7%。罹病植株根系真菌种类为2～4种,仅有稀少真菌和优势种,且优势种的菌落数占其总菌落数的87.7%以上,处于绝对优势,经证明引起玉米茎基腐病的是禾谷镰刀菌。

The rhizosphere microorganism quantity and fungal flora of the healthy and infected corn plants by F.oxysporum were studied. The results showed that the rhizosphere fungi and bacteria quantity of the healthy plants were much higher than those of the infected ones. Quantities of rhizosphere actiomyces of the healthy and infected plants had no obvious difference. 8 sorts of rhizosphere fungi emerge in the healthy plant, including 3 - 4 sorts of common fungi. Dominant colonies of total were from 28.9% to 53.7%. Instead, only 2 - 4 sorts of rhizosphere fungi existed in their infected plant which was rare and dominate fungi. The dominant colonies occupied above 87.7% of the total, which proved to be Fusarium spp., pythium spp.