Mycorrhizal and septate endophytic fungal associations in gymnosperms of southern India

Nagaraj, Kandhasamy; Priyadharsini, Perumalsamy; Muthukumar, Thangavelu

doi:10.6018/analesbio.37.8

Cited by 3 publications

(3 citation statements)

References 34 publications

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“…During the course of restoration, no difference in the biomass of the AMF biomarker 16:1ω5c was observed, except for significantly higher concentrations in cypress plantations (Figure f). This finding was attributable to the obligate AMF characteristics of cypress (Michelsen, Lisanework, & Friis, ; Nagaraj, Priyadharsini, & Muthukumar, ), whereas the other tree species were either ectomycorrhizal or not obligate mycorrhizal plants. The interpretation of PLFA 16:1ω5c, which is often considered as a biomarker for AMF, is problematic in samples from uncontrolled environments, as this marker occurs in AMF as well as from bacterial origin (Butler, Williams, Bottomley, & Myrold, ; Frostegård et al, ).…”

Section: Resultsmentioning

confidence: 99%

Tree species and recovery time drives soil restoration after mining: A chronosequence study

et al. 2018

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Open‐pit mining activities for metals and minerals have impacted vast areas of the Earth's surface and left behind highly disturbed and degraded landscapes. However, our understanding of tree species and recovery time on the restoration of biotic and abiotic soil properties remains incomplete. Topsoil (0–15 cm) was collected from plantations of 4 tree species: alder, acacia, pine, and cypress. A chronosequence of restoration was selected to assess the effect of recovery time: vegetation‐free postmining land (unrestored control), 5–10 years (young plantation), and 20–25 years (old plantation). The soil physicochemical characteristics and phospholipid fatty acids were analysed. After 20 years of restoration, the soil organic carbon (SOC) concentration increased, on average, from 1.4% to 4.7% for alder, cypress, and acacia. However, SOC was similar under pine plantations in unrestored control and at the late stage of restoration. The restoration of soil total nitrogen was faster than the SOC pools for all tree species investigated. Compared with that in the unrestored control, the total microbial biomass increased by 74% after 20–25 years of restoration. A similar increase was observed for bacterial biomass. The studied sites partly exhibited residues of trace elements that exceeded Chinese environmental quality standards (Cd, As, Cu, and Cr). However, only Cu affected the soil community; arbuscular mycorrhizal biomass decreased with an increase in Cu concentration. In conclusion, the recovery time, rather than the tree species, was the main determinant in the alteration of key soil physicochemical parameters in the restoration of phosphate‐mining‐degraded landscapes, at least during the first 20–25 years.

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Section: Resultsmentioning

confidence: 99%

Tree species and recovery time drives soil restoration after mining: A chronosequence study

et al. 2018

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“…However, the research is recent, and a more thorough understanding of the functionality of t his fungal group is still needed. Their coexistence with AMF has been reported in several plant groups (Nagaraj, Priyadharsini, & Muthukumar, 2015;Gucwa-Przepióra, Chmura, & Sokołowska, 2016;Thangavelu & Raji, 2016). Among the few studies on DSE in sugarcane, Nasim, Ali, Munawar, and Bajwa (2008) reported that 80% of the root samples were colonized by the DSE, suggesting that DSE have a role in the biocontrol of sugarcane diseases.…”

Section: Inoculation Treatmentsmentioning

confidence: 96%

Selection of arbuscular mycorrhizal fungi for sugarcane in four soils with the presence of dark septate endophytes

2019

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The present study aimed to select efficient arbuscular mycorrhizal fungi (AMF) for sugarcane growth and P nutrition in four soils that spontaneously contained dark septate endophytes (DSE). The effect of nine AMF isolates was evaluated individually in sugarcane presprouted seedlings (SP81-3250) grown under greenhouse conditions for a 120-day period. The isolates that stimulated plant growth in the soils with low P availability were Acaulospora colombiana (ACOL), Claroideoglomus etunicatum (CETU), Gigaspora margarita (GMAR), Rhizophagus clarus (RCLA) and Scutellospora calospora (SCAL). Compared to the Yellow Argisol, which had the highest P level, the Red-Yellow Argisol, with an intermediate P content, increased plant height. Compared to the other treatments, inoculation with ACOL, RCLA, and SCAL resulted in higher foliar P content in plants grown in soils with high to intermediate P levels. Root colonization by AMF and DSE was verified in the plants, with the coexistence of both fungal groups in the same plant and/or root fragment. However, AMF colonization was low compared to DSE colonization. The cooccurrence of DSE and AMF was higher in the plants inoculated with ACOL, RCLA, SCAL, and Dentiscutata heterogama. ACOL, CETU, GMAR, RCLA, and SCAL are AMF isolates that have the potential to establish a mycorrhizal inoculant for sugarcane that would be effective in several soils.

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“…According to Pearson correlation test, the insuffi ciency in any relationship between mycorrhizal frequency and DSE confi rms the independence of these fungal endophytes, probably owed to their occupation of different niches in the same root system (Nagaraj et al 2015). The remarkable positive correlation between mycorrhizal frequency (F) and species richness (SR) and its absence with spore density suggests that the colonization may be due to great AMF diversity in root systems, not automatically derived from species producing more spores, because, AMF root infection could be involved also by mycorrhizal roots and soil extraradical mycelia, as confi rmed by de Marins et al ( 2009), who showed an important spore occurrence in both macrophytes rhizosphere of whose roots were internally colonized by AMF and in non--colonized macrophytes.…”

Section: Spore Density and Species Richnessmentioning

confidence: 99%

Archives of Environmental Protection

Sidhoum¹,

Fortas²

2018

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The potential of fi ve plants namely Atriplex halimus L., A. canescens (Pursh) Nutt., Suaeda fruticosa (Forssk. ex J.F. Gmel.), Marrubium vulgare L. and Dittrichia viscosa (L.) Greuter from two selected wetlands in northwest Algeria subjected to house and industrial effl uents were examined to assess their arbuscular mycorrhizal fungal (AMF) diversity and colonization, as well as to determine their tolerance and ability in accumulating metallic trace elements (MTEs). The purpose was to investigate whether, or not, these fungi are related to metallic uptake. Arbuscular mycorrhizal association was observed in all plant species, since the dual association between AMF and dark septate endophytes (DSE) was found in roots of 80% plants species. Hence, the decreasing trend of metal accumulation in most plant organs was Zn>Cu>Pb, and the most effi cient species were M. vulgare> S. fruticosa> A. canescens> D. viscosa> A. halimus. The bioaccumulator factors exceeded the critical value (1.0) and the transport factors indicated that all these species were phytoremediators. Pearson correlation showed that Cd bioaccumulation and translocation were inhibited by AMF infection; meanwhile Zn, Pb and Cd accumulation were affected by AMF spore density and species richness, DSE frequency, pH, AMF and plant host. Native halophytes showed a multi-metallic resistance capacity in polluted wetlands. M. vulgare was the most effi cient in metal accumulation and the best host for mycorrhizal fungi. AMF played a major role in metal accumulation and translocation.

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Mycorrhizal and septate endophytic fungal associations in gymnosperms of southern India

Cited by 3 publications

References 34 publications

Tree species and recovery time drives soil restoration after mining: A chronosequence study

Tree species and recovery time drives soil restoration after mining: A chronosequence study

Selection of arbuscular mycorrhizal fungi for sugarcane in four soils with the presence of dark septate endophytes

Archives of Environmental Protection

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