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Contribution of glomalin-related soil proteins to soil organic carbon in trifoliate orange
Applied Soil Ecology ( IF 4.8 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.apsoil.2020.103592
Jia-Dong He , Ge-Ge Chi , Ying-Ning Zou , Bo Shu , Qiang-Sheng Wu , A.K. Srivastava , Kamil Kuča

Abstract Arbuscular mycorrhizal fungi (AMF) produce glomalin-related soil protein (GRSP) that influences organic carbon (C) storage in soil; however, how much purified GRSP fractions contribute to soil organic carbon (SOC) is yet not known. The present study evaluated the contribution of GRSP towards changes in SOC in trifoliate orange grown in a rootbox divided into a roots + hyphae chamber (roots colonized by AMF hyphae and AMF extraradical hyphae) and a hyphae chamber (only the presence of AMF extraradical hyphae, without roots). Three AMF species (Diversispora epigaea, Paraglomus occultum and Rhizoglomus intraradices) were inoculated into the roots + hyphae chamber. Following four months of plant growth, P. occultum showed higher AMF hyphal growth in roots, soils and nylon mesh than D. epigaea or R. intraradices. Mycorrhizal inoculation improved the plant growth performance and increased easily extractable GRSP (EE-GRSP) and difficultly extractable GRSP (DE-GRSP) concentrations in both chambers, regardless of AMF species. The C content observed in total GRSP of the soil after purification was 2.71 ± 0.49 mg g−1, while purified EE-GRSP and DE-GRSP showed the C content of 1.01 ± 0.19 mg g−1 and 1.70 ± 010.34 mg g−1, respectively. The C contribution by purified EE-GRSP and DE-GRSP accounted for 8.67 ± 0.95% and 14.59 ± 2.21%, respectively, of total SOC, with a total C contribution of purified GRSPs accounting for 23.26 ± 2.67% of total SOC. A significantly higher C content of GRSP and the C contribution of GRSP to SOC were observed in DE-GRSP than in EE-GRSP, as well as the soil of the roots + hyphae chamber than the soil of the hyphae chamber. The proportionate distribution of water-stable aggregate in 2–4 and 1–2 mm sizes and their stability were higher under AMF hyphae than under non-AMF hyphae. This study thus provided a database evidence of increased contribution of GRSP towards build-up of SOC in response to mycorrhizal symbiosis.

中文翻译:

球藻蛋白相关土壤蛋白对三叶橙土壤有机碳的贡献

摘要 丛枝菌根真菌(AMF)产生影响土壤有机碳(C)储存的球囊蛋白相关土壤蛋白(GRSP);然而,尚不清楚纯化的 GRSP 组分对土壤有机碳 (SOC) 的贡献有多大。本研究评估了 GRSP 对生长在根箱中的三叶橙 SOC 变化的贡献,该箱分为根 + 菌丝室(根由 AMF 菌丝和 AMF 根外菌丝定殖)和菌丝室(仅存在 AMF 根外菌丝,无根)。将三种 AMF 物种(Diversispora epigaea、Paraglomus occultum 和 Rhizoglomus intraradices)接种到根 + 菌丝室中。经过四个月的植物生长,与 D.epigaea 或 R.intraradices 相比,P. occultum 在根、土壤和尼龙网中显示出更高的 AMF 菌丝生长。菌根接种改善了植物生长性能,并增加了两个室中易提取的 GRSP (EE-GRSP) 和难提取的 GRSP (DE-GRSP) 浓度,无论 AMF 种类如何。净化后土壤总 GRSP 中观察到的 C 含量为 2.71 ± 0.49 mg g-1,而净化后的 EE-GRSP 和 DE-GRSP 显示 C 含量为 1.01 ± 0.19 mg g-1 和 1.70 ± 010.34 mg g-1 , 分别。纯化的 EE-GRSP 和 DE-GRSP 的 C 贡献分别占总 SOC 的 8.67 ± 0.95% 和 14.59 ± 2.21%,纯化 GRSP 的总 C 贡献占总 SOC 的 23.26 ± 2.67%。在 DE-GRSP 中观察到 GRSP 的 C 含量和 GRSP 对 SOC 的 C 贡献显着高于 EE-GRSP,并且根+菌丝室的土壤比菌丝室的土壤显着更高。2-4 和 1-2 毫米大小的水稳性聚集体的比例分布及其稳定性在 AMF 菌丝下比在非 AMF 菌丝下更高。因此,这项研究提供了一个数据库证据,证明 GRSP 对响应菌根共生的 SOC 的建立有更大的贡献。
更新日期:2020-10-01
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