TOR抑制剂雷帕霉素对荔枝霜疫霉生长发育及自噬的影响

吕林; 杨成东; 张雪; 于戈; 陈泰旭; 陈庆河

doi:10.19303/j.issn.1008-0384.2022.011.010

TOR抑制剂雷帕霉素对荔枝霜疫霉生长发育及自噬的影响

doi: 10.19303/j.issn.1008-0384.2022.011.010

吕林^{1, 2,},
杨成东^{1, 2},
张雪¹,
于戈¹,
陈泰旭¹,
陈庆河^{1, 2, ,}

1.
海南大学植物保护学院/热带农林生物灾害绿色防控教育部重点实验室，海南　海口　570228
2.
海南大学三亚南繁研究院/崖州湾种子实验室，海南　三亚　572025

基金项目: 国家自然科学基金项目（32160614）；海南省自然科学基金创新团队项目（321CXTD437）；福建省作物有害生物监测与治理重点实验室开放基金（MIMCP-202102）；海南大学科研启动基金项目 [KYQD(ZR)-20080]

详细信息

作者简介:
吕林（1998−），男，硕士研究生，主要从事疫霉菌基因功能研究（E-mail：1220969543@qq.com）

通讯作者:
陈庆河（1971−），男，博士，研究员，主要从事作物卵菌病害研究（E-mail：qhchen@hainanu.edu.cn）

中图分类号: S 436
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出版历程
- 收稿日期: 2022-08-25
- 修回日期: 2022-09-12
- 网络出版日期: 2022-11-29
- 刊出日期: 2022-11-28

Effect of TOR Inhibitor Rapamycin on Growth, Development, and Autophagy of Peronophythora litchii

LV Lin^{1, 2
,},
YANG Chengdong^{1, 2},
ZHANG Xue¹,
YU Ge¹,
CHEN Taixu¹,
CHEN Qinghe^{1, 2
, ,}

1.
Key Laboratory of Green Prevention and Control of Tropical Plant Diseases and Pests, Ministry of Education/College of Plant Protection, Hainan University, Haikou, Hainan　570228, China
2.
Sanya Nanfan Research Institute, Hainan University/Hainan Yazhou Bay Seed Laboratory, Sanya, Hainan　572025, China

摘要

摘要: 目的明确TOR（Target of Rapamycin）信号通路抑制剂雷帕霉素对荔枝霜疫霉生长发育、致病性及自噬的影响。方法采用不同浓度的TOR抑制剂雷帕霉素处理荔枝霜疫霉菌，观察不同浓度雷帕霉素对荔枝霜疫霉的菌丝生长及形态、孢子囊产生数量、游动孢子释放和致病性的影响，并通过丹酰戊二胺（MDC）染色观察细胞自噬。结果雷帕霉素处理后，荔枝霜疫霉的菌丝生长明显受到抑制，半最大效应浓度（EC₅₀）值为29.18 ng·mL⁻¹，随着雷帕霉素浓度的增加，菌丝生长抑制不同程度增加；当雷帕霉素深度为25.0 ng·mL⁻¹时，菌落生长抑菌率为45.3%，孢子囊产生数量为8.0×10⁴ 个·mL⁻¹，仅为对照组的27.9%；雷帕霉素处理能促进游动孢子的释放；同时严重影响荔枝霜疫霉菌的致病性。通过自噬体观察表明，雷帕霉素处理后荔枝霜疫霉菌丝中自噬体的数量显著增加，促进荔枝霜疫霉的细胞自噬。结论 TOR抑制剂雷帕霉素通过调控荔枝霜疫霉的细胞自噬，从而影响病菌的生长发育及致病性，研究结果为荔枝霜疫霉的致病机制提供科学依据。
- 荔枝霜疫霉 /
- 雷帕霉素 /
- TOR抑制剂 /
- 生长发育 /
- 细胞自噬
Abstract: Objective Effects of the target of rapamycin (TOR) inhibitor rapamycin on the growth, development, pathogenicity, and autophagy of Peronophythora litchi were studied. Method The mycelial growth, sporangial production, zoospore release, and pathogenicity of the P. litchi after being treated by the TOR inhibitor rapanmycin in varying concentrations were determined, while the mycelial autophagy observed under a microscope with MDC staining. Result Rapamycin exhibited significant inhibitory effect on the mycelial growth of P. litchii with an EC₅₀ value of 29.18 ng·mL⁻¹ and varying extents of increases with higher dosages. When treated with 25.0 ng·mL⁻¹ rapamycin, the inhibition rate was 45.3% and the sporulation at 8.0×10⁴ sporangia·mL⁻¹ (which was 27.9% of control), while the zoospore release increased, but the virulence of P. litchii significantly reduced. The MDC-stained autophagosomes significantly increased as well. Conclusion The TOR signaling pathway inhibitor rapamycin played an important role in the mycelial growth, development, and virulence of P. litchii.
- Peronophythora litchii /
- rapamycin /
- TOR inhibitor /
- growth and development /
- autophagy

HTML全文

图 1 雷帕霉素对荔枝霜疫霉生长的影响

①A：不同浓度雷帕霉素处理后荔枝霜疫霉的生长情况；B：不同含量雷帕霉素处理后荔枝霜疫霉影响的菌落直径。②a：CK，b：DMSO，c～f分别表示雷帕霉素含量为12.5、25、50、100 ng·mL⁻¹。③图中数据为平均数±标准差，**表示经单因素方差分析法检验在P＜0.01水平差异显著，图2～4同。

Figure 1. Effect of rapamycin on growth of P. Litchii

①A: Growth of P. litchii as affected by rapamycin dosages; B: Colony diameter of P. litchii treated by varied rapamycin dosages. ②a：CK，b：DMSO，c～f respectively represent rapamycin content 12.5、25、50、100 ng·mL⁻¹。③Data are mean±SE; ** indicates significant difference at P＜0.01 by one-way ANOVA; same for Figs. 2-4.

下载: 全尺寸图片幻灯片

图 2 雷帕霉素对荔枝霜疫霉产孢的影响

①A：雷帕霉素处理后荔枝霜疫霉孢子囊数量的显微观察；B：雷帕霉素处理后荔枝霜疫霉孢子囊数量。②a：CK，b：DMSO，c：25 ng·mL⁻¹雷帕霉素处理，图3同。

Figure 2. Effect of rapamycin on production of P. litchii sporangia

①A: Rapamycin-treated P. litchii sporangia under microscope; B: sporangia count.②a：CK，b：DMSO，c：25 ng·mL⁻¹ Rapamycin treatment, same for Figs. 3.

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图 3 雷帕霉素对荔枝霜疫霉游动孢子释放的影响

A：雷帕霉素处理后荔枝霜疫霉游动孢子释放的显微观察；B：雷帕霉素处理后荔枝霜疫霉游动孢子释放率。

Figure 3. Effect of rapamycin on release of P. litchii zoospores

A: Release of rapamycin-treated P. litchii zoospore under microscope; B: rate of zoospore release.

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图 4 雷帕霉素对荔枝霜疫霉致病性的影响

①A：雷帕霉素处理的荔枝霜疫霉叶片致病性；B：荔枝叶片处理病斑面积比例；C：雷帕霉素处理的荔枝霜疫霉果实致病性；D：荔枝果实处理病斑面积比例。②a：CK，b：DMSO，c：25 ng·mL⁻¹，MOCK：空白对照。

Figure 4. Effect of rapamycin on pathogenicity of P. litchii

①A: Pathogenicity of rapamycin-treated P. litchii on lychee leaf; B: proportion of lesion area on lychee leaf; C: pathogenicity of rapamycin-treated P. litchii on lychee fruit; D: proportion of lesion area on lychee fruit.②a：CK，b：DMSO，c：25 ng·mL⁻¹，MOCK：Blank control。

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图 5 雷帕霉素诱导荔枝霜疫霉自噬体的形成

①a：CK，b：DMSO，c：50 ng·mL⁻¹雷帕霉素处理。②BF：明场，MDC：荧光观察，Merged：合并图像。

Figure 5. Autophagosome formation of P. litchii in response to rapamycin treatment

①a：CK，b：DMSO，c：50 ng·mL⁻¹ Rapamycin treatment.②BF：Bright field，MDC：Fluorescence observation，Merged：Merge images。

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