作物学报 ›› 2021, Vol. 47 ›› Issue (8): 1581-1592.doi: 10.3724/SP.J.1006.2021.04160
戴良香1(
), 徐扬1, 张冠初1, 史晓龙2, 秦斐斐1, 丁红1,*(
), 张智猛1,*(
)
DAI Liang-Xiang1(
), XU Yang1, ZHANG Guan-Chu1, SHI Xiao-Long2, QIN Fei-Fei1, DING Hong1,*(
), ZHANG Zhi-Meng1,*(
)
摘要:
为明确盐胁迫条件下花生根际土壤细菌群落结构的变化, 采用盆栽试验设置不同盐胁迫强度处理, 以开花下针期和成熟期花生根际土壤为研究对象, 提取其总DNA并构建细菌16S rRNA基因文库, 利用高通量测序技术进行测序, 并对测序结果进行生物信息学分析。结果显示, 各处理样本根际土壤优势菌门均为变形菌门(Proteobacteria)、放线菌门(Actinobacteria)、Patescibacteria、酸杆菌门(Acidobacteria)、绿弯菌门(Chloroflexi)。优势菌目分别为(Saccharimonadales)、β-变形菌目(Betaproteobacteria)、鞘脂单胞菌目(sphingomonadales)、芽单胞菌目(Gemmatimonadales)和根瘤菌目(Rhizobiales)。盐胁迫提高了变形菌门(Proteobacteria)的相对丰度, 但降低了放线菌门(Actinobacteria)的相对丰度, 且均随盐胁迫强度提高其升降幅度增大。盐胁迫下基施钙肥使β-变形菌目(Betaproteobacteria)、芽单胞菌目(Gemmatimonadales)和鞘脂单胞菌目(Sphingomonadales)相对丰度显著升高, 并均受盐胁迫强度、生育时期和外源施钙肥的影响。聚类分析结果表明, 较高浓度盐胁迫处理样本的优势菌属组成相似而聚为一组, 非盐胁迫处理样本属水平丰度依生育时期相同而相近, 各聚为一组。盐胁迫强度、生育时期对花生根际土壤微生物菌群类型影响较大, 基施钙肥影响较小。土壤微生物功能预测分析显示, 高盐胁迫可明显降低次生代谢产物、聚糖的生物合成与代谢, 以及氨基酸和脂肪酸代谢等功能基因在根际土壤中的富集。花生旺盛生长期、低盐胁迫和基施钙肥处理使得功能基因丰度大幅提高, 可能对花生生长及胁迫应答具有重要功能。根际土壤微生物菌群多样性的研究将为通过改良土壤微生物环境来提高植物胁迫耐受性提供重要途径。
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