scholarly journals Influence of mycorrhizal fungi on the growth and development of sandy everlasting Helichrysum arenarium (L.) Moench.

2012 ◽  
Vol 62 (1) ◽  
pp. 67-76 ◽  
Author(s):  
Anna K. Sawilska ◽  
Ewa Jendrzejczak ◽  
Monika Welc ◽  
Barbara Kieliszewska-Rokicka
Keyword(s):  
Root System ◽  
Mycorrhizal Fungi ◽  
Growth And Development ◽  
Secondary Succession ◽  
Glomus Intraradices ◽  
Root Colonization ◽  
Growing Season ◽  
Development Phase ◽  
Hydrothermal Conditions ◽  
Natural Plant

The significance of root colonization by mycorrhizal fungi for the growth and development of <i>Helichrysum arenarium</i> was investigated in two independent experiments. In the first experiment the association of root colonization level with the pluviothermal conditions within the growing season and the age of a natural plant population was analyzed. In the second one, under controlled conditions, the influence of artificial inoculation with the arbuscular fungus <i>Glomus intraradices</i> on the features of plants raised from achenes was studied. It was shown that hydrothermal conditions during blooming period had a greater influence on reproduction processes of sandy everlasting than both the population age (the secondary succession progress) and the level of root colonization by mycorrhizal fungi. High amount of precipitation at plant generative development phase positively influences the potential and actual fertility of ramets. The presence of arbuscular fungus in the soil favors the growth and development of sandy everlasting specimens at their early growing stages: they have a better-developed root system and a greater photosynthetic area.

Quantifying the growth of arbuscular mycorrhizal fungi: usefulness of the fractal dimension

Botany ◽  
2009 ◽  
Vol 87 (4) ◽  
pp. 387-400 ◽  
Author(s):  
Christine Juge ◽  
Annie Champagne ◽  
Andrew P. Coughlan ◽  
Nicolas Juge ◽  
Lael Parrott ◽  
...  
Keyword(s):  
Fractal Dimension ◽  
Mycorrhizal Fungi ◽  
Growth And Development ◽  
Time Course ◽  
Glomus Intraradices ◽  
Fungal Growth ◽  
Arbuscular Mycorrhizal ◽  
Hyphal Growth ◽  
Growth Cycle

The present study is, to the best of our knowledge, the first to investigate the use of the fractal dimension (FD) to quantify the growth and development of undisturbed, fully functional arbuscular mycorrhizal (AM) hyphae developing in vitro. The majority of the work focused on the model AM fungus Glomus intraradices DAOM 181602. The time course study and final measurements of an intact mature extraradical mycelium allowed us to compare the development of the mycelium and the FD value. The final FD value of 1.62 for the mature mycelium is similar to that obtained for highly branched root systems and tree crowns. The FD method was used to characterize the morphology of germinative and presymbiotic hyphae in the presence of stimulatory (strigolactone GR-24, 0.1 µmol·L–1 and bisphenol A, 10 µmol·L–1) and inhibitory (NaCl, 80 mmol·L–1) molecules, and the extraradical phase in the presence of an inhibitory molecule (NaCl, 80 mmol·L–1). Where possible, results were compared with those obtained using the traditional grid-line (GL) technique. The FD approach allowed treatment effects to be accurately quantified, both in germinative and extraradical phases. In the second case, this technique provided a single quantitative value of extraradical hyphal growth that included runner hyphae (RH) networks, and fine-branching (FB) ramifications. This is in contrast to the GL technique, which provides a value for the estimation of RH, but which is not suitable for accurately measuring FB hyphae. Given the ease with which the FD values can be calculated, and the fact that this method can provide a single value for the quantification of extraradical hyphal growth and development, we suggest that this method is useful for in vitro studies. Furthermore under certain situations of germinative or presymbiotic growth, it may be used in concert with the GL method to provide a greater degree of information about hyphal morphology. The usefulness and limits of the FD method at different stages of the AM fungal growth cycle are discussed.

scholarly journals Linear growth and development of white lupine plants depending on growing technology and weather conditions

1970 ◽  
pp. 57-67
Author(s):  
A. V. Holodna ◽  
N. H. Buslaeva
Keyword(s):  
Growth And Development ◽  
Abiotic Factors ◽  
Treatment Plant ◽  
Statistical Processing ◽  
Weather Conditions ◽  
Growing Season ◽  
Critical Periods ◽  
Hydrothermal Conditions ◽  
White Lupine ◽  
Object Of Study

Purpose. Determination of the influence of seed biodisinfectant, stimulator of growth and foliar feeding on the white lupine growth and development in the context of climate change. Methods. Field (to study the interaction of the object of study with biotic and abiotic factors); morphophysiological (for biological control over development of productivity elements at the stages of organogenesis); weight (to establish the indicators parameters of the crop structure elements and determine the grain yield); statistical (statistical processing of the research results). Results. The results of the analysis of the indicators of the average daily air temperature and the amount of precipitation from April to August and their comparison with long-term values are presented. Indicators of height and aboveground mass of white lupine plants in dynamics, depending on the pre-sowing seed treatment, plant growth stimulant and foliar feeding, correlation dependences of these indicators on the hydrothermal conditions of the growing season have been established. Conclusions. The growth and development of white lupine plants depends on the elements of the technology of its cultivation, as well as hydrothermal conditions during the growing season of the crop. The highest plants (83.0 cm) with their maximum weight (143,8 g/plant) were noted in the variant where the seeds of white lupine were treated with БТУ-р bioinoculant simultaneously with the MicoHelp biodisinfectant and foliar feeding of plants with micronutrient fertilizer Trazex at the ІХ stage of organogenesis was carried out. Mathematical models have been developed that confirm the close relationship between the level of height indicators and the aboveground mass of white lupine plants with weather conditions, the critical periods of their influence in the ontogenesis of plants were also determined.

The effect of flavones and flavonols on colonization of tomato plants by arbuscular mycorrhizal fungi of the genera Gigaspora and Glomus

2007 ◽  
Vol 53 (6) ◽  
pp. 702-709 ◽  
Author(s):  
Jose M. Scervino ◽  
María A. Ponce ◽  
Rosa Erra-Bassells ◽  
Josefina Bompadre ◽  
Horst Vierheilig ◽  
...  
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Mycorrhizal Fungi ◽  
Glomus Intraradices ◽  
Root Colonization ◽  
Arbuscular Mycorrhizal ◽  
Hyphal Growth ◽  
Tomato Plants ◽  
Entry Points ◽  
Chemical Groups ◽  
Positive Effect

No clear data are available on how flavonoids from different chemical groups affect root colonization by arbuscular mycorrhizal fungi (AMF) and whether flavonoids affecting the presymbiotic growth of AMF also affect root colonization by AMF. In the present work, we compared the effect of flavones (chrysin and luteolin) and flavonols (kaempferol, morin, isorhamnetin, and rutin) on root colonization (number of entry points and degree of root colonization) of tomato plants ( Lycopersicum esculentum L.) with the effect of these flavonoids on the presymbiotic growth of these AMF, which has been reported in a recent study. With all tested AMF ( Gigaspora rosea , Gigaspora margarita , Glomus mosseae, and Glomus intraradices) a correlation between the number of entry points and the percentage of root colonization was found. When the number of entry points was high, root colonization was also enhanced. Application of the flavones chrysin and luteolin and of the flavonol morin increased the number of entry points and the degree of colonization,whereas the flavonols kaempferol, isorhamnetin, and rutin showed no effect. These results show that in contrast to their effect on the presymbiotic growth of the AMF on the level of root colonization, the tested flavonoids do not exhibit a genus- and species-specificity. Moreover, comparison of our data with the data obtained by J.M. Scervino, M.A. Ponce, R. Erra-Bassells, H. Vierheilig, J.A. Ocampo, and A. Godeas. (2005a. J. Plant Interact. 15: 22–30) indicates that a positive effect on the hyphal growth of AMF does not necessarily result in an enhanced AM root colonization, further indicating that the mode of action of flavonoids at the level of root colonization is more complex.

Vesicular–arbuscular mycorrhizal fungi associated with native tall grass prairie and cultivated winter wheat

1983 ◽  
Vol 61 (8) ◽  
pp. 2140-2146 ◽  
Author(s):  
B. A. Daniels Hetrick ◽  
J. Bloom
Keyword(s):  
Winter Wheat ◽  
Mycorrhizal Fungi ◽  
Root Colonization ◽  
Fungal Spores ◽  
Arbuscular Mycorrhizal ◽  
Growing Season ◽  
Fungal Species ◽  
Tall Grass ◽  
Wheat Field ◽  
Vesicular Arbuscular

More vesicular–arbuscular mycorrhizal (VAM) fungal species and significantly more fungal spores were recovered from undisturbed prairie soils than four winter wheat field soils in Kansas through the 1980–1981 growing season. Two previously undescribed sporocarpic species of Endogonaceae were found in prairie samples but have not been successfully established in pot culture, leaving the genus to which they belong unclear. Though variable, 11–50% VAM root colonization was evident in all prairie grass roots sampled throughout the year. In contrast, no identifiable VAM root colonization was evident in wheat until May after flowering when 27% root colonization was observed. During the 1981–1982 growing season, roots of two other wheat fields were sampled with similar results. No colonization occurred until May when 8% root colonization was evident. The possible influence of such low levels of root colonization occurring quite late in the growing season of winter wheat is discussed.

scholarly journals The influence of bioregulating adaptogens on the growth processes, development and decorative qualities of an orchid

2021 ◽  
Vol 845 (1) ◽  
pp. 012068
Author(s):  
N I Varfolomeeva ◽  
V V Kazakova ◽  
V S Dinkova ◽  
O Yu Manilova
Keyword(s):  
Chemical Composition ◽  
Root System ◽  
Mycorrhizal Fungi ◽  
Growth And Development ◽  
Biologically Active ◽  
Cultivated Plants ◽  
Mineral Salts ◽  
Wide Range ◽  
Control Variant ◽  
Productive Growth

Abstract At present, plant biostimulating adaptogens used in the process of growing a wide range of cultivated plants are artificial analogs of natural stimulants, the chemical composition of which contains phytohormones, amino acids and a vitamin complex, which enhance the growth and development of the root system of plants by several times. The effectiveness of these agents is explained by the creation of a mutually beneficial symbiosis of the mycelium of mycorrhizal fungi and the root system of the plant, thereby providing the roots of the orchid with biologically active elements: mineral salts, enzymes, hormones and vitamins. Mycorrhizal fungi, in turn, receive carbohydrates necessary for their growth and development. Due to the fact that indoor plants contain a small amount of growth regulators in their chemical composition, their synthetic analogs are necessary for the productive growth and development of the orchid, which determines the relevance of the research carried out. The article presents the results of experiments on the effect of biostimulating adaptogens Ribav-extra, Ecopin and Epin-extra on the process of root formation of cuttings and morphological features in the studied species of dendrobium orchid. The studied plants were propagated in three ways: by dividing the bush, pseudobulbs and cuttings. The cuttings were soaked for 18 h before planting in drug solutions at a concentration of 1 ml/10 L of water. Also, vegetative plants were sprayed twice with biostimulants: in the phase of regrowth of the first leaf and two weeks later at a concentration of 0.5 ml/10 L of water. The results obtained showed differences in the experimental variants in terms of the onset of phenological phases: the beginning of the formation and regrowth of roots, leaves and peduncles, as well as the flowering period. The reaction of dendrobium to treatment with Ribav-extra, Ecopin and Epin-extra was revealed. In plants in all variants, the preparations used stimulated the development of the root system, leaf apparatus, and the appearance of peduncles. The phenophase data in the tested plants occurred 7-28 days earlier in comparison with the control variant (without the use of bioregulators). The treatment of the test plants with the growth regulator Ribav-extra promoted earlier regrowth of the first and second roots and leaves (by 20-28 days). Ekopin turned out to be the most passive and did not significantly affect the rate of development of the tested plants. The phenophases of regrowth of the 1st root and 1st leaf began 3-5 days earlier than the plants of the control variant. Ribav-extra and Epin-extra stimulated the appearance of peduncles in plants by the age of 3 years.

Vesicular-arbuscular mycorrhizae of Easter lily in the northwestern United States

1977 ◽  
Vol 23 (12) ◽  
pp. 1663-1668 ◽  
Author(s):  
R. N. Ames ◽  
R. G. Linderman
Keyword(s):  
Root System ◽  
Mycorrhizal Fungi ◽  
Arbuscular Mycorrhizae ◽  
Lilium Longiflorum ◽  
Growing Season ◽  
Fungal Species ◽  
Easter Lily ◽  
Vesicular Arbuscular ◽  
Va Mycorrhizal Fungi ◽  
Isolated Species

The vesicular-arbuscular (VA) mycorrhizal fungi of commercially grown Easter lily (Lilium longiflorum Thunb.) were studied. Soil and root samples were collected monthly from March through September 1975 from five fields in the coastal area of southern Oregon and northern California. Soil seivings were inoculated onto clover, onion, and lily to cause infections resulting in the production of many new mycorrhizal spores facilitating identification. Four VA mycorrhizal species were found: Acaulospora trappei, A. elegans, Glomus monosporus, and G. fasciculatus. All four VA species infected Easter lily, clover, and onion. Acaulospora trappei and G. fasciculatus were the most commonly isolated species from all five fields.Mycorrhizal infections in roots of field-grown lilies were sparse and presumably young in March and gradually increased in size and number until September when bulbs were harvested. Over 75% of each root system became infected with mycorrhizae in fields with all four fungal species, and those levels were reached by July. In fields with only two mycorrhizal species, usually 50% or less of each root system was infected, even by the end of the growing season.

scholarly journals 010 Colonization Potential of Ornamental Plants by Two Vesicular-Arbuscular Mycorrhizal Fungi

HortScience ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 442D-442
Author(s):  
S. Bergeron ◽  
M.-P. Lamy ◽  
B. Dansereau ◽  
S. Gagne ◽  
S. Parent ◽  
...  
Keyword(s):  
Mycorrhizal Fungi ◽  
Glomus Intraradices ◽  
Root Colonization ◽  
Ornamental Plants ◽  
Arbuscular Mycorrhizal ◽  
Am Fungi ◽  
Experimental Period ◽  
Vesicular Arbuscular ◽  
Colonization Potential ◽  
Solanaceae Family

While the majority of terrestial plants are colonized in soils by vesicular-arbuscular fungi (AM), that does not mean that these species can form a symbiosis with AM fungi in an artificial substrate under commercial production conditions. The purpose of this study was to identify those plants having a colonization potential. In Mar. 1998, 51 species and cultivars of ornamental plants were inoculated with two vesicular-arbuscular fungi (Glomus intraradices Schenk & Smith, and Glomus etunicatum Becker & Gerdemann; Premier Tech, Rivière-du-Loup, Quèbec). Periodic evaluations of colonization were done 5, 7, 9, 12, and 16 weeks after seeding. More than 59% of these plants tested were shown to have a good colonization potential with G. intraradices. Species belonging to the Compositae and Labiatae families all colonized. Species in the Solanaceae family showed slight to excellent colonization. Several species studied belonging to the Amaranthaceae, Capparidaceae, Caryophyllaceae, Chenopodiaceae, Cruciferae, Gentianaceae, Myrtaceae et Portulaceae families were not colonized. Root colonization with G. etunicatum was not detected on these species and cultivars during this short experimental period.

scholarly journals Phosphorus availability changes the internal and external endomycorrhizal colonization and affects symbiotic effectivenes

2007 ◽  
Vol 64 (3) ◽  
pp. 295-300 ◽  
Author(s):  
Marco Antonio Nogueira ◽  
Elke Jurandy Bran Nogueira Cardoso
Keyword(s):  
Mycorrhizal Fungi ◽  
Glomus Intraradices ◽  
Root Colonization ◽  
Plant Biomass ◽  
Higher Plants ◽  
Arbuscular Mycorrhizal ◽  
P Availability ◽  
Mycorrhizal Root ◽  
Mycorrhizal Effectiveness ◽  
External Mycelium

Despite the awareness that high phosphorus (P) availability decreases the mycorrhizal root colonization in higher plants, the effects on the external mycelium are contradicting. The aim of this work was to assess the external mycelium of the arbuscular mycorrhizal fungi (AMF) Glomus intraradices and Gigaspora rosea, associated to soybean under increasing P levels (0, 25, 50, 100 and 200 mg kg-1). The tested hypotheses were: a) the amount of external mycelium depends on the fungal species; b) the P levels affect diferentially each mycorrhizal species; c) the mycorrhizal effectiveness depends on the amount of external mycelium. Mycorrhizal stimulus on plant biomass occurred at P levels of 0, 25 and 200 mg kg-1. Mycorrhizal root colonization and total external mycelium (TEM) decreased with increasing P levels. At zero P level, G. rosea produced less TEM than G. intraradices, which may be related to the lower mycorrhizal effectiveness for G. rosea. Both AMF increased the active external mycelium along P levels, but this increase was not related with symbiotic effectiveness. TEM was found to be closely related to root colonization and mycorrhizal effectiveness. The root colonization and TEM are mutually afected by P availability. Althoug G. intraradices produced more TEM than G. rosea along the P levels, they seemed to affect similarly the TEM for both AMF. More AMF species should be assessed in order to attest whether P levels affect the external mycelium differentially among them.

scholarly journals Biomass allocation, leaf gas exchange and nutrient uptake of hazelnut seedlings in response to Trichoderma harzianum and Glomus intraradices inoculation

2017 ◽  
Vol 63 (No. 5) ◽  
pp. 219-226 ◽  
Author(s):  
Rostamikia Younes ◽  
Kouchaksaraei Masoud Tabari ◽  
Asgharzadeh Ahmad ◽  
Rahmani Ahmad
Keyword(s):  
Gas Exchange ◽  
Nutrient Uptake ◽  
Biomass Allocation ◽  
Trichoderma Harzianum ◽  
Mycorrhizal Fungi ◽  
Glomus Intraradices ◽  
Root Colonization ◽  
Leaf Gas Exchange ◽  
Dry Mass ◽  
Physiological Characteristics

Mycorrhizal fungi form mutualistic symbioses with the roots of 80% of plants which increase growth and nutrient uptake for the host plants. This research was conducted to determine the effect of individual Glomus intraradices Schenck &amp; Smith and Trichoderma harzianum Rifai species on the root colonization, biomass allocation, physiological characteristics and nutrient uptake of hazelnut (Corylus avellana Linnaeus) seedlings in the nursery. The results showed that both G. intraradices and T. harzianum improved biomass, physiological characteristics and nutrient uptake of hazelnut seedlings as well as simultaneous root colonization. However, the growth rate for G. intraradices treatment was significantly higher than that for T. harzianum treatment. The highest leaf dry mass (2.66 g), root dry mass (3.39 g), root volume (11.31 cm<sup>3</sup>), total plant dry weight (11.20 g) were detected in seedlings inoculated with G. intraradices. Inoculation with G. intraradices and T. harzianum increased net photosynthesis (64 and 26%), stomatal conductance (66.1 and 31.4%) and water use efficiency (50 and 22%). Both G. intraradices and T. harzianum showed increased nutrient accumulation. The G. intraradices treatment resulted in the most efficient nutrient absorption with increases of 58.4% (N), 85.2% (P) and 83.2% (K) in plants. It can be deduced that although G. intraradices in comparison with T. harzianum more favourably affected the growth and leaf gas exchange as well as nutrient uptake of hazelnut seedlings, it can be suggested that the inoculation of hazelnut roots with both arbuscular mycorrhizal fungi is a proper measure to produce the healthy and strong seedlings of this species in the nursery.

Dynamics of CO2 emission from chernozems under agricultural use

2017 ◽  
Vol 4 (3) ◽  
pp. 43-49
Author(s):  
M. Miroshnychenko ◽  
O. Siabruk
Keyword(s):  
Carbon Dioxide ◽  
Agricultural Practices ◽  
Growing Season ◽  
Warm Period ◽  
Direct Seeding ◽  
Soil Tillage ◽  
Plant Residues ◽  
Hydrothermal Conditions ◽  
Organic Mineral ◽  
Mineral System

Aim. The comparison of the effect of hydrothermal conditions and various agricultural practices on the emission of CO 2 from chernozems in the Left-Bank Forest-Steppe of Ukraine. Methods. The dynamics of the intensity of carbon dioxide emissions from chernozem calcic (typical chernozem – in Ukrainian classifi cation) was studied during the growing season of 2011–2012. The observations were based on two fi eld experiments with various methods of soil till- age (6–7 years from the beginning of the experiment) and fertilization systems (21–22 years from the beginning of the experiment). Particularly, plowing at 20–22 cm, disking at 10–12 cm, cultivation at 6–8 cm and direct seeding using Great Plains drill were studied among the soil tillage methods. Mineral system (N 45 P 50 K 45 ), organic system (manure 8 t/ha) and combined organic-mineral system (manure 8 t/ha + N 45 P 50 K 45 ) were studied among fertilization systems. The intensity of CO 2 fl ux was determined using the non-stationary respiratory chambers by the alkaline absorption method, with averaging of the results during the day and the frequency of once a month. Results. During the warm period, the emission of carbon dioxide from the soil changes dynamically depending on temperature and humidity. The maximum of emission coincides with the periods of warm summer showers in June-July, the minimum values are characteristic for the late autumn period. The total emission losses of carbon in chernozems over the vegetation period ranged from 480 to 910 kg/ha and varied depending on the methods of tillage ± (4.0–6.0) % and fertilization systems ± (3.8–7.1) %. The changes in the intensity of CO 2 emission from the soil under different methods of soil tillage are associated with hydrothermal regime and the depth of crop residues location. The biggest difference is observed im- mediately after tillage, but in the spring period the differences are only 12–25 %, and after drying of the top layer of soil become even less. Direct seeding technology provides the greatest emission of CO 2 from chernozem, which is fa- cilitated by better water regime and more complete mineralization of plant residues on the soil surface. Annual losses of carbon are the least under disking of soil at 10–12 cm. The changes in the intensity of CO 2 emission from the soil under different fertilization systems are associated with the involvement of the additional organic matter from plant residues and manure to the microbiological decomposition. The greatest emission was observed under the organic- mineral fertilization system, which increased the loss of carbon by 7–8 % in comparison with the mineral system in the unfavorable hydrothermal year and by 11–15 % in the more favorable year. These differences are observed mainly during the fi rst half of the growing season when there is a clear tendency to increase the intensity of soil respiration. Conclusions. The hydrothermal conditions of the warm period of the year are decisive in the formation of the CO 2 emission fl ow from chernozems. Due to the improvement of agricultural practices, emissions might be reduced but not more that by 15 % of natural factor contribution.

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