scholarly journals Towards a consistent benchmark for plant mycorrhizal association databases: a reply to FungalRoot : global online database of plant mycorrhizal associations

2021 ◽  
Author(s):  
C. Guillermo Bueno ◽  
John Davison ◽  
Daniela Leon ◽  
Yiming Meng ◽  
Maarja Öpik ◽  
...  
2020 ◽  
Vol 11 (1) ◽  
pp. 33
Author(s):  
Enny Widyati

<p><strong>Abstrak.</strong> Seperti halnya dunia manusia, tumbuhan juga mengembangkan sistem komunikasi untuk mencapai kesejahteraan hidupnya. Bahasa yang digunakan adalah senyawa kimia yang diproduksi oleh eksudat akar. Tumbuhan merupakan inisiator karena mereka yang memiliki tujuan untuk apa komunikasi dibangun. Tumbuhan mengeluarkan eksudat akar untuk memanggil atau untuk mengusir mikroba yang diinginkan. Tumbuhan mengirim surat undangan pada beberapa mikroba dengan mensekresikan eksudat akar. Untuk membangun asosiasi mikoriza tumbuhan mengeluarkan gula, asam amino dan strigolakton. Hal tersebut akan dibalas oleh fungi dengan mengeluarkan senyawa flavonoid yang menunjukkan spesifikasi jenis inang-mikoriza. Hadirnya senyawa flavonoid merupakan undangan bagi rhizobium pada tanaman legum untuk membangun asosiasi. Tumbuhan akan menyeleksi rhizobium yang akan diajak berasosiasi dengan mensekresikan senyawa kanavanin yang bersifat toksik. Kesalahan dalam mengeluarkan eksudat akar merupakan surat undangan yang keliru bagi tumbuhan. Dosis senyawa stigolakton yang terlalu rendah tidak akan dapat membentuk asosiasi mikoriza tetapi yang berkembang adalah patogen. Walaupun tumbuhan menghasilkan senyawa fitoantisipin untuk mencegah serangan patogen dan fitoaleksin ketika patogen sudah menginfeksi. Komunikasi akar dengan akar tumbuhan lain dilakukan dengan menghasilkan senyawa alelopati untuk membatasi pertumbuhan akar di sekelilingnya yang dianggap sebagai pesaing. Tanaman invasif atau gulma umumnya selain menghasilkan alelopati juga memproduksi katekin yang dapat membunuh mikroba menguntungkan pada tumbuhan setempat. Akibatnya tumbuhan lokal akan rentan terhadap serangan penyakit dan berujung pada kematian. Selain alelopati, untuk merespon kehadiran tetangganya tumbuhan juga menghasilkan senyawa glukosinolat yang jumlahnya makin meningkat sejalan dengan tingginya biodiversitas vegetasi. Senyawa ini merupakan senyawa beracun bagi patogen, sehingga tumbuhan yang dibudidayakan dengan pola monokultur menjadi rentan terhadap penyakit. Oleh karena itu agar tanah tetap memiliki kandungan senyawa glukosinolat yang memadai serta tetap memelihara kondisi rhizosfir yang dinamis perlu dilakukan pergiliran tanaman varietas lokal setelah beberapa rotasi tanaman.</p><p><em><strong>Abstract.</strong> Similar to human, plants also develop a communication system to achieve their prosperity. Plants utilize chemical compounds of their root exudates as the “languange”. Plants are the initiator of communications, since they define the purposes of building communication. Root exudates are released either to attract or to demenish the soil microbes target as an “invitation letter” to some microbes. To build a mycorrhizal association, for examples, plants issue sugars, amino acids and strygolactones to the rhizosphere. Fungi will reply the invitation by secreting flavonoid compounds that determine host-mycorrhizal specifications. The presence of flavonoids is another invitation to rhizobia to establish association in legume rhizosphere. Plants will select attracted bacteria to build the most host-specific rhizobium association by secreting canavanine compounds that are toxic to non-target rhizobia. Occasionally, an error happened in issuing invitation. When plant release strygolactone in a very low dosages, it will be failure to build mycorrhizal associations otherwise pathogen colonizations, although plants produce either phytoantisipine to prevent pathogens infection or phytoalexin to counter infected pathogens. Communication among roots of neighboring plants is conducted by producing allellopathy compound to limit root growth of the competitors. Invasive plants or weeds generally also produce catechine compounds over the allellophaty that will eliminate soil beneficial microbes of the indigenous plants. As a result, the native plants will be vulnerable to disease and lead to distinct. Responding to the presence of neighboring roots, plants also produce glucosinolate compounds. Glucocynolate consentration will be increased in line with the richness of vegetation biodiversity. These compounds are toxic to the pathogen, which is why plants cultivated in monoculture become more susceptible to disease. Furthermore, to improve soil glucocynolate and to manage the dynamics in the rhizosphere, need to a shift cultivation after several rotations of a commodity with the local varieties.</em></p>


1988 ◽  
Vol 36 (4) ◽  
pp. 461 ◽  
Author(s):  
JH Warcup

The mycorrhizal associations of Australian Lobelioideae (Lobelia, Pratia and Isotoma) were found to be complex. Perennial species of these genera were solely VA mycorrhizal, whereas annual species were both VA and ectomycorrhizal. Lobelia gibbosa, L. simplicicaulis and L. rhomblfolia had unusual inter- cellular mycorrhizas formed with ectomycorrhizal ascomycetes. While all annual Australian Lobelioideae formed associations with both VA and ectomycorrhizal fungi, five species of Lobelia from South Africa or North America were solely VA mycorrhizal, whether annual or perennial. Seed of the Australian Lobelioideae examined required a ripening period of several months or longer before germination. Seed of L. gibbosa, L. simplicicaulis and L. rhombifolia on germination produced only a short radicle that did not develop further unless invaded by a mycorrhizal fungus. Seed of L. gibbosa and L. simplicicaulis placed beside growing mycorrhizas of certain ascomycetes with young plants of Melaleuca uncinata germinated, and the seedlings became mycorrhizal, grew, and flowered. The subterranean stage dependent on mycorrhizal association with a companion plant lasted 3-4 months. Germinated seed of L. gibbosa on simple agar media failed to become mycorrhizal with appropriate ascomycetes or to develop further. In asymbiotic culture on media incorporating sucrose seedling growth was slight but, in the presence of sucrose and kinetin or N-benzylaminopurine, L. gibbosa developed shoots and often formed small plants that flowered. Root development, however, was scanty or absent even in the presence of the growth substances α-naphthaleneacetic acid or 2,4-Dichlorophenoxyacetic acid. Young plants of L. gibbosa from the field transplanted to U.C. mix or sterilised forest soil failed to produce new roots. The plants grew slowly but remained small and produced few flowers, suggesting that mycorrhizal companion plants may also contribute to their growth besides being necessary in seedling development.


2005 ◽  
Vol 85 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Cynthia Grant ◽  
Shabtai Bittman ◽  
Marcia Montreal ◽  
Christian Plenchette ◽  
Christian Morel

Plants require adequate P from the very early stages of growth for optimum crop production. Phosphorus supply to the crop is affected by soil P, P fertilizer management and by soil and environmental conditions influencing P phytoavailability and root growth. Phosphorus uptake in many crops is improved by associations with arbuscular mycorrhizal fungi. Cropping system and long-term input of P through fertilizers and manures can influence the amount and phytoavailability of P in the system and the development of mycorrhizal associations. Optimum yield potential requires an adequate P supply to the crop from the soil or from P additions. Where early-season P supply is low, P fertilization may improve P nutrition and crop yield potential. Alternately, under low-P conditions, encouragement of arbuscular mycorrhizal associations may enhance P uptake by crops early in the growing season, improving crop yield potential and replacing starter fertilizer P applications. Soil P supply that exceeds P requirements of the crop may preclude mycorrhizal development. To encourage arbuscular mycorrhizal association, threshold levels of soil solution P that restrict mycorrhizal development must not be exceeded. Sustainable P management practices must be applied both in conventional and in alternative biologically based agricultural systems. Key words: Microbiology, fertility, colonization


1985 ◽  
Vol 33 (6) ◽  
pp. 669 ◽  
Author(s):  
Rl Peterson ◽  
AE Ashford ◽  
WG Allaway

Roots of 42 species of angiosperms collected from all vegetation zones on Heron Island were cleared, stained with chlorazol black E and assessed for vesicular-arbuscular mycorrhizae (VAM). Percentage of root length colonized was determined using the gridline intersect method, while stages in internal development of the mycorrhizal association were determined by mounting cleared root pieces on microscope slides and examining them with Nomarski differential interference contrast microscopy. Fifty-seven percent of the species had VAM and of these the percentage of root length colonized varied from 3 to 100%. There were no statistically significant differences among the four vegetation zones of the island in the number of species colonized. About the same proportion of trees and shrubs had VAM as did the herbs. Two species of Brassicaceae, Lepidium virginicum and Sisymbrium orientale, had VAM. All but three species with VAM had both arbuscules and vesicles; arbuscules were not found in Casuarina equisetifolia var. incana, Sisymbrium orientale and Tribulus cistoides.


2020 ◽  
Vol 227 (3) ◽  
pp. 955-966 ◽  
Author(s):  
Nadejda A. Soudzilovskaia ◽  
Stijn Vaessen ◽  
Milagros Barcelo ◽  
Jinhong He ◽  
Saleh Rahimlou ◽  
...  

2021 ◽  
Vol 12 ◽  
Author(s):  
Bahareh Bicharanloo ◽  
Timothy R. Cavagnaro ◽  
Claudia Keitel ◽  
Feike A. Dijkstra

Plants spend a high proportion of their photosynthetically fixed carbon (C) belowground to support mycorrhizal associations in return for nutrients, but this C expenditure may decrease with increased soil nutrient availability. In this study, we assessed how the effects of nitrogen (N) fertiliser on specific root respiration (SRR) varied among mycorrhizal type (Myco type). We conducted a multi-level meta-analysis across 1,600 observations from 32 publications. SRR increased in ectomycorrhizal (ECM) plants with more than 100 kg N ha−1 applied, did not change in arbuscular mycorrhizal (AM) and non-mycorrhizal (NM) plants, but increased in plants with a dual mycorrhizal association in response to N fertilisation. Our results suggest that high N availability (&gt;100 kg N ha−1) could disadvantage the growth of ECM plants because of increased C costs associated with maintaining higher root N concentrations, while the insensitivity in SRR by AM plants to N fertilisation may be because AM fungi are more important for phosphorus (P) uptake.


1991 ◽  
Vol 39 (5) ◽  
pp. 445 ◽  
Author(s):  
MC Brundrett ◽  
LK Abbott

This survey included 109 plants native to the jarrah forest (a mediterranean eucalypt woodland in south-western Australia dominated by Eucalyptus marginata and E. calophylla). Mycorrhizal formation by seedlings of these plants was examined after inoculation with isolates of vesicular-arbuscular mycorrhizal (VAM) fungi, or after growth in intact cores of natural habitat soil containing VAM and ectomycorrhizal (ECM) fungi. These methods were supplemented by examining roots from mature forest-grown plants, so that different methods and criteria for designating mycorrhizal association types could be considered. Most plants had one of the following types of mycorrhizal association: VAM only (56% of species); both ECM and VAM (16% of species); or non-mycorrhizal roots (25% of species, which also had long root hairs and/or cluster roots). Plants with dual ECM/VAM associations often formed ECM more readily than VAM. With the exception of the large and diverse families, Papilionaceae, Myrtaceae and Anthericaceae, plants within a family had consistent mycorrhizal relations, as did the members of most genera.


2021 ◽  
Vol 12 ◽  
Author(s):  
Litao Lin ◽  
Yun Chen ◽  
Guorui Xu ◽  
Yuxin Zhang ◽  
Shuang Zhang ◽  
...  

Cities are prone to ecological problems, yet the impacts of rapid global urbanization on the feedback between above- and belowground subsystems remain largely unknown. We sampled the roots of 8 common herbaceous plants within the Fifth Ring (urban areas) and in Jiufeng National Forest Park (rural areas) in Beijing (China) to assess the impacts of urbanization on the network of plant-arbuscular mycorrhizal (AM) fungal associations. Using Illumina MiSeq sequencing, 81 AM fungal OTUs were identified in 78 herb root samples. The Shannon, Simpson, and Pielou indices of root AM fungi in urban areas were significantly higher than those in rural areas. In this study, a significantly nested mycorrhizal association network was observed in rural areas (NODF = 64.68), whereas a non-nested pattern was observed in urban areas (NODF = 55.50). The competition index C-score (0.0769) of AM fungi in urban areas was slightly lower than that in rural areas (0.1431), and the species specialization (d’) of 8 host plants and fungal dissimilarity among 8 host plants in urban areas were significantly lower than those in rural areas. Convergent associations among hosts may be an important factor influencing this non-nested pattern of the plant-AM fungi network in urban areas. Generalists, rather than specialists, were enhanced during the establishment of mycorrhizal associations in urban areas. Our results suggest that reduced selectivity of host plants, and generalist promotion and specialist reduction of AM fungi during urbanization may contribute to the non-nested network of plant-AM fungal associations.


Science ◽  
2020 ◽  
Vol 367 (6480) ◽  
pp. eaba1223 ◽  
Author(s):  
Leho Tedersoo ◽  
Mohammad Bahram ◽  
Martin Zobel

Mycorrhizal fungi provide plants with a range of benefits, including mineral nutrients and protection from stress and pathogens. Here we synthesize current information about how the presence and type of mycorrhizal association affect plant communities. We argue that mycorrhizal fungi regulate seedling establishment and species coexistence through stabilizing and equalizing mechanisms such as soil nutrient partitioning, feedback to soil antagonists, differential mycorrhizal benefits, and nutrient trade. Mycorrhizal fungi have strong effects on plant population and community biology, with mycorrhizal type–specific effects on seed dispersal, seedling establishment, and soil niche differentiation, as well as interspecific and intraspecific competition and hence plant diversity.


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