Relationships between yield, rotation length, and abundance of Olpidium brassicae and Pyrenochaeta sp. in the rhizosphere of oilseed rape
Relationships between yield, rotation length, and abundance of Olpidium brassicae and Pyrenochaeta sp. in the rhizosphere of oilseed rape
复制标题
DOI：
10.1016/j.apsoil.2019.103433
复制
发表时间：
2020-03-01
影响因子：
4.8
通讯作者：
Bending, Gary D.
中科院分区：
文献类型：
--
作者：
Bennett, Amanda J.;Hilton, Sally;Bending, Gary D.
英国的油菜产量随着轮作频率的增加而下降。以前，两种土传生物（甘蓝油孢菌（壶菌门）和核壳菌属（子囊菌门））被确定为具有较高的相对丰度在根际真菌群落与油菜作物产量下降，已记录。为了更好地了解这些生物与油菜作物的关系，本研究旨在调查在宽范围的旋转频率下生长的油菜根际真菌微生物组。从一个长期轮作试验点在整个生长季节的三个时间点收集的样品被用来确定真菌群落组成，并定量O。分析表明，在所有油菜轮作中，根和根际真菌群落的组合是相似的，这主要是由于O.油菜，无论种植频率。在所有的轮换中，Olpidium brassicae丰度在3月（季中）达到峰值，然后在6月（收获前）下降。相比之下，Pyrenochaeta sp.在整个季节中大量增加，6月份达到的水平明显高于本赛季早些时候。Pyrenochaeta sp.在季节早期（1月）在连续种植和交替种植的油菜（两年内种植一年）中比在油菜作物之间具有较长间隙的轮作中具有更大的丰度。在短期轮作中观察到的OSR产量下降，由于其在延长的轮作检查（高达6年的差距）的流行，芸苔属不能单独相关。
Oilseed rape yields in the UK have been found to decline with more frequent cropping in a rotation. Previously, two soil-borne organisms (Olpidium brassicae (Chytridiomycota) and Pyrenochaeta sp. (Ascomycota)) were identified as having high relative abundance in rhizosphere fungal communities associated with oilseed rape crops where yield decline had been recorded. In order to better understand these organisms' association with the oilseed rape crop, the current study was designed to investigate the fungal rhizosphere microbiome of oilseed rape grown in a wide range of rotational frequencies. Samples collected from a long-term rotation trial site at three time points through the growing season were used to determine fungal community composition, and quantification of O. brassicae and Pyrenochatea sp. Analyses showed the combined root and rhizosphere fungal communities were similar across all oilseed rape rotations, largely due to the high relative abundance of O. brassicae, irrespective of cropping frequency. Olpidium brassicae abundance peaked in March (mid-season) in all rotations, before declining in abundance by June (pre-harvest). In contrast, Pyrenochaeta sp. increased in abundance throughout the season, with significantly higher levels reached in June than earlier in the season. Pyrenochaeta sp. had a greater abundance early in the season (January) in continuously grown and alternate oilseed rape (grown one year in two) than in rotations with longer gaps between oilseed rape crops This study concludes that O. brassicae cannot be solely associated with yield decline of OSR observed in short rotation cropping due to its prevalence in the extended rotations examined (up to 6-year gap).