固氮菌缓解氮限制环境中丛枝菌根真菌对加拿大一枝黄花的营养竞争

doi:10.17521/cjpe.2020.0114

植物生态学报 ›› 2020, Vol. 44 ›› Issue (7): 782-790.DOI: 10.17521/cjpe.2020.0114 cstr: 32100.14.cjpe.2020.0114

所属专题：入侵生态学；根系生态学；菌根真菌

• 研究论文 • 上一篇

固氮菌缓解氮限制环境中丛枝菌根真菌对加拿大一枝黄花的营养竞争

庞芳¹, 夏维康¹, 何敏¹, 祁珊珊², 戴志聪¹^,²^,^*(), 杜道林¹

¹江苏大学环境与安全工程学院, 江苏镇江 212013
²江苏大学农业工程学院现代农业装备与技术教育部重点实验室, 江苏镇江 212013

收稿日期:2020-04-21 接受日期:2020-06-12 出版日期:2020-07-20 发布日期:2020-06-23
基金资助:
国家自然科学基金)(31700342);国家自然科学基金(31700342和31770446)(31770446);中国博士后科学基金(2017T100329);江苏省高校优势学科

Nitrogen-fixing bacteria alleviates competition between arbuscular mycorrhizal fungi and Solidago canadensis for nutrients under nitrogen limitation

PANG Fang¹, XIA Wei-Kang¹, HE Min¹, QI Shan-Shan², DAI Zhi-Cong¹^,²^,^*(), DU Dao-Lin¹

¹ School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
² Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, School of Agricultural Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China

Received:2020-04-21 Accepted:2020-06-12 Online:2020-07-20 Published:2020-06-23
Supported by:
National Natural Science Foundation of China(31700342);National Natural Science Foundation of China(31770446);China Postdoctoral Science Foundation(2017T100329);Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)

摘要/Abstract

摘要：

丛枝菌根真菌(AMF)能与大多数陆生植物的根系形成共生体, 有助于宿主植物吸收养分。但营养胁迫下, 根系微生物对AMF与宿主植物间关系的影响少见报道。该研究假设: 在营养极度匮乏(如氮胁迫)环境下, AMF与宿主植物可能产生营养竞争, 而固氮菌的介入能够缓解两者对营养的竞争关系。为了验证这一假设, 该文探究了加拿大一枝黄花(Solidago canadensis)生长受限的氮浓度, 并在氮受限条件下检验了AMF、加拿大一枝黄花及固氮菌三者间的关系。结果表明: 低氮处理明显抑制了加拿大一枝黄花的地上生物量和总生物量, 尤其以0.025 mmol·L^-1 N的氨态氮对加拿大一枝黄花的负影响更甚。在此氮浓度下, 单独添加AMF总体上都进一步抑制了加拿大一枝黄花的生长, 而固氮菌的添加在一定程度上提高了氮受限条件下AMF对宿主的根部侵染率及宿主植物生物量。这表明固氮菌能够缓和氮受限条件下AMF和加拿大一枝黄花间的营养竞争关系。研究结果加深了对外来植物在极度营养胁迫环境下与多种微生物互作的入侵机制的理解。

关键词: 丛枝菌根真菌, 氮限制, 营养竞争, 固氮菌, 入侵植物

Abstract:

Aims Arbuscular mycorrhizal fungi (AMF) form symbiotic relationships with most terrestrial plants, contributing to the nutrient uptake of host plants. While little is known on how rhizospheric microorganisms affect the relationships between AMF and host plants under nutritional stress. We hypothesize that AMF may compete for nutrients with host plants in extremely nutrient-limited environments, such as nitrogen deficient habitats, and nitrogen-fixing bacteria will alleviate the competition.
Methods In order to test our hypotheses, we grew Solidago canadensis plants under nitrogen deficient treatments. We inoculated plants with AMF and a nitrogen-fixing bacterium to test the relationships among the host plant and microorganisms.
Important findings Under the lowest nitrogen level (0.025 mmol·L^-1 N of ammonium nitrogen), the growth of S. canadensis was more restricted with AMF colonization, suggesting competition between AMF and the host. However, with the inoculation of nitrogen-fixing bacterium, AMF colonization was promoted and plant growth was increased. These results indicate that nitrogen-fixing bacteria could moderate the competition for nutrients between AMF and their host under nitrogen deficiency. This study improves our understanding of the invasion mechanisms of alien plants, where they interact with different microorganisms under extreme nutrient stress.

Key words: arbuscular mycorrhizal fungi, nitrogen limitation, nutrients competition, nitrogen-fixing bacteria, invasive plant

庞芳, 夏维康, 何敏, 祁珊珊, 戴志聪, 杜道林. 固氮菌缓解氮限制环境中丛枝菌根真菌对加拿大一枝黄花的营养竞争. 植物生态学报, 2020, 44(7): 782-790. DOI: 10.17521/cjpe.2020.0114

PANG Fang, XIA Wei-Kang, HE Min, QI Shan-Shan, DAI Zhi-Cong, DU Dao-Lin. Nitrogen-fixing bacteria alleviates competition between arbuscular mycorrhizal fungi and Solidago canadensis for nutrients under nitrogen limitation. Chinese Journal of Plant Ecology, 2020, 44(7): 782-790. DOI: 10.17521/cjpe.2020.0114

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2020.0114

https://www.plant-ecology.com/CN/Y2020/V44/I7/782

图/表 8

图1 分离固氮菌的16S rDNA (A)和固氮基因nifH (B)电泳图。 DL, DNA分子量标准物; NC, 空白对照; JS106, 星孢类芽孢杆菌ScRB-JS106。

Fig. 1 Electrophoretogram of the isolated nitrogen-fixing bacterium. A, 16S rDNA. B, Nitrogen-fixing gene nifH. DL, DNA marker; NC, negative control; JS106, Paenibacillus stellifer ScRB-JS106.

图2 基于16S rDNA序列的分离固氮菌的亲缘关系树(邻接法)。其他菌株的序列是从基因库中下载所得。

Fig. 2 Neighbour-joining tree of the isolated nitrogen-fixing bacterium, ScRB-JS106, based on 16S rDNA. Sequences for the other isolates were downloaded from GenBank.

图3 不同NH4Cl浓度下加拿大一枝黄花的生长情况(平均值±标准偏差, n = 4)。 CK, 对照处理(10 mmol·L-1 N)。不同小写字母表示差异显著(p < 0.05)。

Fig. 3 Growth of Solidago canadensis under different concentrations of ammonium chloride (mean ± SE, n = 4). CK, negative control (10 mmol·L-1 N). Different lowercase letters indicate significant differences (Duncan’s test, p < 0.05).

图4 不同KNO3浓度下加拿大一枝黄花的生长情况(平均值±标准偏差, n = 4)。 CK, 对照处理(10 mmol·L-1 N)。不同小写字母表示差异显著(p < 0.05)。

Fig. 4 Growth of Solidago canadensis under different concentrations of potassium nitrate (mean ± SE, n = 4). CK, negative control (10 mmol·L-1 N). Different lowercase letters indicate significant differences (Duncan’s test, p < 0.05).

图5 不同菌剂接种方式下加拿大一枝黄花根部的丛枝菌根真菌侵染率(平均值±标准偏差, n = 6)。 A, 幼套球囊霉(GE)。 B, 根内球囊霉(GI)。C, 摩西球囊霉(GM)。JS106, 星孢类芽孢杆菌ScRB-JS106。ns, 无显著性差异(p > 0.05)。

Fig. 5 Root colonization rate of Solidago canadensis inoculated with various arbuscular mycorrhizal fungi and nitrogen-fixing bacteria (mean ± SE, n = 6). A, Glomus etunicatum (GE). B, Glomus intraradices (GI). C, Glomus mosseae (GM). JS106, Paenibacillus stellifer ScRB-JS106. ns, no significant difference (p > 0.05).

图6 氮限制环境中接种幼套球囊霉及同时添加固氮菌处理加拿大一枝黄花的生长情况(平均值±标准偏差, n = 6)。 GE, 幼套球囊霉。JS106, 星孢类芽孢杆菌ScRB-JS106。CK, 未添加GE处理。ns, 无显著性差异(p > 0.05)。

Fig. 6 Growth of Solidago canadensis inoculated with Glomus etunicatum and nitrogen-fixing bacteria under nitrogen limitation (mean ± SE, n = 6). GE, G. etunicatum. JS106, Paenibacillus stellifer ScRB-JS106. CK, un-inoculated control. ns, no significant difference (p > 0.05).

图7 氮限制环境中接种根内球囊霉及同时添加固氮菌处理加拿大一枝黄花的生长情况(平均值±标准偏差, n = 6)。 GI, 根内球囊霉。JS106, 星孢类芽孢杆菌ScRB-JS106。CK, 未添加GI处理。ns, 无显著性差异(p > 0.05)。

Fig. 7 Growth of Solidago canadensis inoculated with Glomus intraradices and nitrogen-fixing bacteria (mean ± SE, n = 6). GI, Glomus intraradices. JS106, Paenibacillus stellifer ScRB-JS106. CK, un-inoculated control. ns, no significant difference (p > 0.05).

图8 氮限制环境中接种摩西球囊霉及同时添加固氮菌处理加拿大一枝黄花的生长情况(平均值±标准偏差, n = 6)。 GM, 摩西球囊霉。JS106, 星孢类芽孢杆菌ScRB-JS106。CK, 未添加GM处理。ns, 无显著性差异(p > 0.05)。

Fig. 8 Growth of Solidago canadensis inoculated with Glomus mosseae and nitrogen-fixing bacteria (mean ± SE, n = 6). GM, G. mosseae. JS106, Paenibacillus stellifer ScRB-JS106. CK, un-inoculated control. ns, no significant difference (p > 0.05).

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固氮菌缓解氮限制环境中丛枝菌根真菌对加拿大一枝黄花的营养竞争

Nitrogen-fixing bacteria alleviates competition between arbuscular mycorrhizal fungi and Solidago canadensis for nutrients under nitrogen limitation

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