Arbuscular mycorrhizal fungi associated with citrus orchards under different types of soil management, southern China

Abstract

Communities of arbuscular mycorrhizal fungi (AMF) were studied in sod culture (SC), straw mulching (NM), and herbicide treated and no-tillage (NH) citrus orchards, respectively. The highest total colonization rate (39.47%) and hyphal length density (1.15 m/g soil) were found in SC, the highest spore numbers (1024 spores/100 g soil) in NM, while the lowest ones (31.50%, 0.94 m/g soil and 719 spores/100 g soil) in NH and they varied significantly among three different types of orchards. Total 18 AMF species belonging to five families, Acaulosporaceae (four species), Claroideoglomeraceae (two species), Gigasporaceae (one species), Glomeraceae (nine species) and Pacisporaceae (two species) were identified, and Glomus aggregatum and Claroideoglomus etunicatum were the dominant species in all surveyed plots. The redundancy analysis showed that AMF community structure was influenced greatly by pH, soil management, soil organic matter (C ox ) and available phosphorus (P Olsen ). In SC orchards, species richness and Shannon-Wiener index of AMF were notably higher than in other treated orchards. So, it is reasonable to select SC as the best practice in citrus orchard in order to enhance AMF benefits.

Implication of Urochloa spp. Intercropping and Conservation Agriculture on Soil Microbiological Quality and Yield of Tahiti Acid Lime in Long Term Orchard Experiment

“…However, the variables qCO 2 , yield, and AMF, which were associated and which had little positive correlation with the fungal community of ECO, responded positively to the treatment with the ecological mower, as they did for yield ( Figure 7) and AMF ( Figure 6). Previous researchers [58] found a positive correlation between the increased diversity of AMF species and the use of P. notatum as a cover crop for citrus orchards.…”

“…Arbuscular mycorrhizae fungi facilitate carbon sequestration and increase the presence of organic carbon in the soil, transfer assimilated carbon to the plants by symbiosis [56], improve nutrient and water absorption, and increase soil quality and aggregation [57,58]. In the mulched intra-row (ECO treatment), the percentage of root colonization by arbuscular mycorrhizae fungi was increased.…”

“…In the mulched intra-row (ECO treatment), the percentage of root colonization by arbuscular mycorrhizae fungi was increased. Mulching with plant biomass and the absence of herbicide can promote a larger network of AMF mycelium, which can contribute to soil aggregation, as well as to higher infiltration and aeration rates [58].…”

Transcriptome responses of grafted Citrus sinensis plants to inoculation with the arbuscular mycorrhizal fungus Glomus versiforme

“…However, P. trifoliata and C. junos have short root hairs, or few root hairs, in field conditions. Thus, they rely on arbuscular mycorrhizal (AM) fungi for optimal growth (Wang et al 2012;Wu and Xia 2006). The mutualistic symbiosis between plant roots and AM fungi is a complex trait resulting in cooperative interactions between the two symbionts.…”

Do convencional ao orgânico: respostas de um manejo de transição em um pomar cítrico

“…Dentre os defensivos agrícolas o mais impactante estão os fungicidas, que também produzem alterações na microbiota do solo conforme seus componentes químicos (ZHOU et al, 2011;CAMPOS et al, 2015;WANG et al, 2016). (CARVALHO, 1999;FABER;DOWNER;MENGE, 2001;BREMER NETO et al, 2008;WANG et al, 2012). Entretanto, com o advento do HLB o tráfego de maquinários dentro do pomar e o volume de agroquímicos aumentaram significativamente, limitando a expressão de tais benefícios (FOCCHI et al, 2004;SCAPIM, 2007;BECERRA et al, 2010).…”