Agricultural intensification, soil biodiversity and agro-ecosystem function in the tropics: the role of mycorrhiza in crops and trees

Munyanziza, E.; Kehri, Harbans Kaur; Bagyaraj, D. J.

doi:10.1016/s0929-1393(96)00152-7

Cited by 59 publications

(30 citation statements)

References 34 publications

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“…We also observed higher levels of soil organic C in the opuntia system (Table 1). Several other studies have also reported positive correlations between the fractions of GRSP and soil organic C content, both for natural and for cultivated soils (BIRD et al, 2002;NICHOLS;RILLIG et al, 2003;UPADHYAYA, 1996).…”

Section: Resultsmentioning

confidence: 86%

“…Furthermore, the nutritional benefits from the AMF allow plants to be better supplied with P and with essential nutrients for nodule formation and biological fixation of N 2 . In addition to P, the absorption of Cu, Zn and Mo also favors nodulation and N 2 fixation (PACOVSKY et al, 1986). In addition, the rhizobium, as well as other microorganisms, are producers of hydrolytic enzymes known as "helpers", which facilitate the penetration of the fungus into the roots (MOREIRA; SIQUEIRA, 2006).…”

Section: Resultsmentioning

confidence: 99%

“…From these, G. tortuosum, S. cerradensis, R. fulgida, R. novaum, A. excavata and A. morrowiaewere found exclusively in treeless systems, whereas Acaulospora longula and G. clavisporum were detected only in the land use systems with trees present, where a total of 11 AMF species were observed. Changes in plant composition may cause AMF species to lose their hosts, creating difficulties for sporulation (MUNYANZIZA et al, 1997). The species R. novaum and A. foveoreticulata were not included on the species list at the Blaszkowski site.…”

Section: Resultsmentioning

confidence: 99%

“…Seasonal variations in the frequency of AMF species do not necessarily reflect their elimination from the environment (PURIN et al, 2006). Annual hosts, such as leguminous plants and grasses that can be present in one season and absent in another hinder, or at least do not facilitate, the production of spores by some species and, consequently, their detection in the soil.…”

Section: Resultsmentioning

confidence: 99%

“…These fungi play a significant role in increasing the establishment and productivity of tree species, especially in semi-arid regions where plant productivity is limited by low soil fertility and water availability (RAO;TARAFDAR, 1998).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

<b>Arbuscular mycorrhizal fungi within agroforestry and traditional land use systems in semi-arid Northeast Brazil</b> - doi: 10.4025/actasciagron.v35i3.16213

et al. 2013

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ABSTRACT. The diversity of arbuscular mycorrhizal fungi (AMF) can be a critical factor in enhancing both the productivity and the diversity of plants in ecosystems, and the plants in the ecosystem also strongly influence the occurrence of these fungi. The relationships between different land use systems and AMF communities in the semi-arid region of the State of Paraíba, NE Brazil were evaluated. The experiment followed a split-plot randomized block design, with four replicates. The main plots were defined by the presence or absence of trees (gliricidia and maniçoba), while the split plots were defined by three land use systems: 1) traditional cropping of maize + beans, 2) buffel grass pasture, and 3) prickly pear forage crop. The presence of trees increased sporulation, mycorrhizal colonization and the production of infective propagules of AMF in all three land use systems. Greater production of glomalin-related soil protein (GRSP) occurred in the prickly pear plots regardless of the presence or absence of trees. Species belonging to the Glomus genus predominated regardless of the presence of trees, land use systemor soil sampling period.Keywords: mycorrhizae, agroecosystems, glomalin.Fungos micorrízicos arbusculares em sistemas agroflorestais e sistemas tradicionais de uso da terra no semi-árido do nordeste do Brasil RESUMO. A diversidade de fungos micorrízicos arbusculares (FMA) pode ser um fator crucial para aumentar a produtividade e diversidade de plantas nos ecossistemas, e em contrapartida, as plantas também influenciam fortemente a ocorrência desses fungos. Foi avaliada a relação entre diferentes sistemas de uso da terra e as comunidades de FMA na região semi-árida do Estado da Paraíba, Nordeste do Brasil. O experimento foi conduzido em esquema de parcelas subdividas em blocos casualizados, com quatro repetições. A presença ou ausência de árvores (gliricídia e maniçoba) foram parcelas principais e três sistemas de uso da terra foram as subparcelas: 1) cultivo tradicional de milho + feijão; 2) pastagem de capim buffel e 3) cultivo de palma forrageira. A presença das árvores aumentou a colonização micorrízica, esporulação e produção de propágulos de FMA em todos os três sistemas de uso da terra. Houve maior produção de proteínas do solo relacionadas à glomalina pelos FMA em parcelas com o cultivo de palma forrageira, independentemente da presença das árvores. Espécies de FMA pertencentes ao gênero Glomus predominaram independentemente da presença das árvores, do sistema de uso da terra e do período de amostragem do solo.Palavras-chave: micorrizas, agroecossistemas, glomalina.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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<b>Arbuscular mycorrhizal fungi within agroforestry and traditional land use systems in semi-arid Northeast Brazil</b> - doi: 10.4025/actasciagron.v35i3.16213

et al. 2013

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Arbuscular mycorrhizal colonization and spore density across different land‐use types in a hot and arid ecosystem, Southwest China

Yan

Zhao

2007

Z. Pflanzenernähr. Bodenk.

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SummaryWe investigated the arbuscular mycorrhizal (AM) colonization and spore density in cropped land, fallow land, and an undisturbed savanna ecosystem under hot and arid climatic conditions in a valley of southwest China. Plants surveyed in the three land-use types showed heavy arbuscular mycorrhizal colonization, indicating a high mycorrhizal dependency of plants in this environment. One-way analysis of variance (ANOVA) showed that the colonization of different AM structures and the spore density varied greatly among plant species both within and between different land-use types. The AM colonization and spore density were higher in undisturbed than in fallow or cropped land. No significant correlation between AM colonization and spore density was observed when land-use types were either considered separately or together. Cluster analysis based on the similarity in AM status with respect to both colonization and spore density showed similarities between fallow land and the undisturbed savanna. The results indicate that continuous cropping reduces AM colonization and spore density. These parameters appear to nearly fully recover when the land has been left to fallow for 4 years.

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Root trait plasticity and plant nutrient acquisition in phosphorus limited soil

Kumar

Shahbaz

Koirala

et al. 2019

J. Plant Nutr. Soil Sci.

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To overcome soil nutrient limitation, many plants have developed complex nutrient acquisition strategies including altering root morphology, root hair formation or colonization by arbuscular mycorrhizal fungi (AMF). The interactions of these strategies and their plasticity are, however, affected by soil nutrient status throughout plant growth. Such plasticity is decisive for plant phosphorus (P) acquisition in P‐limited soils. We investigated the P acquisition strategies and their plasticity of two maize genotypes characterized by the presence or absence of root hairs. We hypothesized that in the absence of root hairs plant growth is facilitated by traits with complementary functions, e.g., by higher root mycorrhizal colonization. This dependence on complementary traits will decrease in P fertilized soils. At early growth stages, root hairs are of little benefit for nutrient uptake. Regardless of the presence or absence of root hairs, plants produced average root biomass of 0.14 g per plant and exhibited 23% root mycorrhizal colonization. At later growth stages of maize, contrasting mechanisms with functional complementarity explained similar plant biomass production under P limitation: the presence of root hairs versus higher root mycorrhizal colonization (67%) favored by increased fine root diameter in absence of root hairs. P fertilization decreased the dependence of plant on specific root traits for nutrient acquisition. Through root trait plasticity, plants can minimize trade‐offs for developing and maintaining functional traits, while increasing the benefit in terms of nutrient acquisition and plant growth. The present study highlights the plasticity of functional root traits for efficient nutrient acquisition strategies in agricultural systems with low nutrient availability.

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Agricultural intensification, soil biodiversity and agro-ecosystem function in the tropics: the role of mycorrhiza in crops and trees

Cited by 59 publications

References 34 publications

<b>Arbuscular mycorrhizal fungi within agroforestry and traditional land use systems in semi-arid Northeast Brazil</b> - doi: 10.4025/actasciagron.v35i3.16213

<b>Arbuscular mycorrhizal fungi within agroforestry and traditional land use systems in semi-arid Northeast Brazil</b> - doi: 10.4025/actasciagron.v35i3.16213

Arbuscular mycorrhizal colonization and spore density across different land‐use types in a hot and arid ecosystem, Southwest China

Root trait plasticity and plant nutrient acquisition in phosphorus limited soil

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