scholarly journals THE EFFECT OF FUNGAL ACTIVITY ON PHOTOSYNTHETIC PARAMETERS OF DIFFERENT CANNA CULTIVARS UNDER FIELD CONDITIONS

2019 ◽  
Vol 18 (3) ◽  
Author(s):  
Marek Kopacki ◽  
Mariusz Szmagara ◽  
Agnieszka Jamiołkowska ◽  
Barbara Skwaryło-Bednarz ◽  
Krystyna Rysiak ◽  
...  
Keyword(s):  
Root Rot ◽  
Photosynthetic Activity ◽  
Pathogenic Fungi ◽  
Co2 Concentration ◽  
Disease Index ◽  
Fusarium Avenaceum ◽  
Photosynthetic Parameters ◽  
Pathogenic Species ◽  
Fusarium Spp ◽  
La Boheme

Three-year studies (2014–2016) were conducted in Lublin in the south-east Poland. The objects of research were the plants of ten canna cultivars: ‘Aida’, ‘America’, ‘Botanica’, ‘Cherry Red’, ‘La Boheme’, ‘Lucifer’, ‘Picasso’, ‘Robert Kemp’, ‘President’ and ‘Wyoming’. Observations were carried out each year in October. Plants with symptoms of stem and root rot, leaves yellowing and wilt were noticed on the investigated plantations. The plants were studied with regard to photosynthetic activity and also by disease index for all cultivars and statistical analysis was carried out upon them. The effect of disease index on photosynthetic intensity and transpiration was determined after the calculation of Pearson’s correlation coefficient. Infected plants were collected for mycological analysis. The results of mycological analysis showed that canna plants were colonized by Fusarium spp., Sclerotinia spp. and Alternaria spp. Alternaria alternata, Fusarium oxysporum, Fusarium avenaceum and Sclerotinia sclerotiorum predominated among pathogenic species. The best health status and the lowest number of colonies were noticed for plants of cv. ‘Botanica’. The infection of canna leaves by pathogenic fungi has negatively affected the intensity of photosynthesis, transpiration, stomatal conductance and sub-stomatal CO2 concentration and it was largely related to the degree of infestation of specified varieties of canna. The photosynthesis process was limited especially in ‘La Boheme’, ‘Picasso’, ‘Cherry Red’ and ‘President’ cultivars, which were infected most frequently by pathogenic fungi. It was confirmed by negative Pearson’s coefficient.

scholarly journals Fungi colonizing diseased plants of chrysanthemum (Chrysanthemum x grandiflorum /Ramat./ Kitam) grown under covers in Sandomierz region

2012 ◽  
Vol 58 (2) ◽  
pp. 213-224
Author(s):  
Marek Kopacki ◽  
Anna Wagner
Keyword(s):  
Fusarium Oxysporum ◽  
Sclerotinia Sclerotiorum ◽  
Root Rot ◽  
Soil Fungi ◽  
Ornamental Plants ◽  
Pathogenic Fungi ◽  
Fusarium Avenaceum ◽  
Pathogenic Species

Chrysanthemum is one of the most important ornamental plants growing under covers in Poland but it is often infected by soil fungi. Investigations were carried out in 1999-2001 (summer and autumn) in 9 horticultural farms in Sandomierz district. Plants with symptoms of stem and root rot, leaves yellows and wilt were noticed on the investigated plantations. The results of mycological analysis showed that chrysanthemum plants were colonized by <i>Fusarium</i> spp., <i>Cylindrocarpon</i> spp., <i>Rhizoctonia</i> spp., <i>Sclerotinia</i> spp. and <i>Alternaria</i> spp. Among isolated fungi <i>Fusarium oxysporum</i>, <i>Fusarium avenaceum</i> and <i>Sclerotinia sclerotiorum</i> were predominating pathogenic species. Cv. Snowdon was colonized by pathogens most frequently, while the population of pathogenic fungi from cv. Royalys was the lowest.

scholarly journals EFFECT OF MYCORRHIZA INOCULATION OF PEPPER SEEDLINGS (Capsicum annuum L.) ON THE GROWTH AND PROTECTION AGAINST Fusarium oxysporum INFECTION

2019 ◽  
Vol 18 (1) ◽  
pp. 161-169
Author(s):  
Agnieszka Jamiołkowska ◽  
Władysław Michałek
Keyword(s):  
Fusarium Oxysporum ◽  
Root Rot ◽  
Mycorrhizal Fungi ◽  
Photosynthetic Activity ◽  
Pathogenic Fungus ◽  
Arbuscular Mycorrhizal ◽  
Sweet Pepper ◽  
Disease Index ◽  
Mycorrhizal Inoculation ◽  
And Control

A study was conducted to investigate the ability of arbuscular mycorrhizal fungi (AMF) in enhancing the growth and control of a root rot caused by different isolates of Fusarium oxysporum in sweet pepper seedlings. The plants were grown in plastic pots filled with sterilized horticultural soils. There were four treatments applied as follows: Fo (seedlings infected with fungus), M (seedlings inoculated with mycorrhizal fungi), Fo + M (seedlings inoculated with mycorrhiza and infected with fungus) and control. A randomized experiment was used and the growth, disease index, and photosynthetic activity of the plants were measured after 4 weeks. The investigations showed that the mycorrhizal inoculation had a protective effect on the F. oxysporum-infected pepper seedlings. The plants were characterized by a higher growth rate and a lower disease index than those growing only in the presence of the pathogenic fungus. The roots inoculated with mycorrhizal fungi were better developed than those infected only with F. oxysporum. The mycorrhiza contributed to an increase in the photosynthetic activity of the pepper seedlings.

scholarly journals Elevated CO2 concentration affects vertical distribution of photosynthetic activity in Calamagrostis arundinacea (L.) Roth

Beskydy ◽  
2017 ◽  
Vol 10 (1-2) ◽  
pp. 67-74
Author(s):  
Karel Klem ◽  
Petr Holub ◽  
Otmar Urban
Keyword(s):  
Climate Change ◽  
Vertical Profile ◽  
Photosynthetic Activity ◽  
Co2 Concentration ◽  
Grass Species ◽  
Photosynthetic Parameters ◽  
Ecosystem Responses ◽  
Experimental Glass ◽  
Grassland Ecosystems ◽  
Photosynthetic Responses

An understanding of photosynthetic responses to elevated CO2 concentration (EC) across the entire vertical canopy profile will help to achieve more proper simulation of ecosystem responses to expected climate change. Accordingly, we studied changes in vertical gradients of photosynthetic parameters in the grass species Calamagrostis arundinacea under EC at the time of anthesis. Plants were transplanted and grown for 3 years under ambient (385 ppm; AC) and elevated (700 ppm; EC) atmospheric CO2 concentrations in experimental glass domes. In general, EC reduced the variability of photosynthetic activity within the vertical profile of plants. Such changes also altered the differences between AC and EC in the vertical profile. While EC led to greater accumulation of chlorophylls, CO2 assimilation rate, and efficiency of photochemical processes in lower leaves, EC primarily reduced stomatal conductance and transpiration rate in upper leaves. These changes resulted in higher water-use efficiency in lower leaves. On the other hand, we found slightly greater down-regulation of photosynthesis under EC in lower leaves indicated as the A700/A385 ratio. Such knowledge may be important in upscaling EC effects from leaves to the canopy level and modelling impacts of expected climate change on grassland ecosystems.

scholarly journals Fungi colonizing roots of zucchini (Cucurbita pepo L. var. giromontina) plants and pathogenicity of Fusarium spp. to zucchini seedlings

2012 ◽  
Vol 64 (1) ◽  
pp. 73-78 ◽  
Author(s):  
Agnieszka Jamiołkowska ◽  
Anna Wagner ◽  
Krzysztof Sawicki
Keyword(s):  
Root Rot ◽  
Laboratory Tests ◽  
Cucurbita Pepo ◽  
Disease Index ◽  
Pathogenicity Test ◽  
Fusarium Spp ◽  
Soil Borne Fungi

Zucchini is a very valuable vegetable, easy to grow both in the field and under covers but it is often attacked by soil-borne fungi. The investigations were carried out in a farm near Lublin where three zucchini cultivars: Astra, Atena and Soraya, were grown in a tunnel and in the field in 2008-2009. Plants with stem and root rot were collected for laboratory tests. Mycological analysis showed that the predominant fungi were <i>F. culmorum</i>, <i>F. equiseti</i> and <i>F. oxysporum</i>. More <i>Fusarium</i> colonies were isolated from the roots of zucchini grown in the tunnel. In the pathogenicity test, all tested isolates of <i>F. culmorum</i>, <i>F. equiseti</i> and <i>F. oxysporum</i> proved to be pathogenic to zucchini seedlings, causing stunting, stem and root rot. The highest disease index was noticed in the combination with <i>F. culmorum</i> isolate fck61.

scholarly journals Photosynthesis and Related Physiological Parameters Differences Affected the Isoprene Emission Rate among 10 Typical Tree Species in Subtropical Metropolises

2021 ◽  
Vol 18 (3) ◽  
pp. 954
Author(s):  
Junyao Lyu ◽  
Feng Xiong ◽  
Ningxiao Sun ◽  
Yiheng Li ◽  
Chunjiang Liu ◽  
...  
Keyword(s):  
Photosynthetic Rate ◽  
Tree Species ◽  
Urban Areas ◽  
Emission Rate ◽  
Intercellular Co2 Concentration ◽  
Co2 Concentration ◽  
Single Species ◽  
Photosynthetic Parameters ◽  
Emission Rates ◽  
Isoprene Emission

Volatile organic compound (VOCs) emission is an important cause of photochemical smog and particulate pollution in urban areas, and urban vegetation has been presented as an important source. Different tree species have different emission levels, so adjusting greening species collocation is an effective way to control biogenic VOC pollution. However, there is a lack of measurements of tree species emission in subtropical metropolises, and the factors influencing the species-specific differences need to be further clarified. This study applied an in situ method to investigate the isoprene emission rates of 10 typical tree species in subtropical metropolises. Photosynthesis and related parameters including photosynthetic rate, intercellular CO2 concentration, stomatal conductance, and transpiration rate, which can influence the emission rate of a single species, were also measured. Results showed Salix babylonica always exhibited a high emission level, whereas Elaeocarpus decipiens and Ligustrum lucidum maintained a low level throughout the year. Differences in photosynthetic rate and stomatal CO2 conductance are the key parameters related to isoprene emission among different plants. Through the establishment of emission inventory and determination of key photosynthetic parameters, the results provide a reference for the selection of urban greening species, as well as seasonal pollution control, and help to alleviate VOC pollution caused by urban forests.

scholarly journals First Report of Root Rot Caused by Fusarium avenaceum on Coptis chinensis in Chongqing, China

Plant Disease ◽  
2020 ◽  
pp. PDIS-05-20-1110
Author(s):  
P. Y. Mei ◽  
X. H. Song ◽  
Z. Y. Zhu ◽  
L. Y. Li
Keyword(s):  
Root Rot ◽  
Fusarium Avenaceum ◽  
Coptis Chinensis ◽  
First Report

scholarly journals Using Commercial Compost as Control Measures against Cucumber Root-Rot Disease

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Kamel Kamal Sabet ◽  
Magdy Mohamed Saber ◽  
Mohamed Adel-Aziz El-Naggar ◽  
Nehal Samy El-Mougy ◽  
Hatem Mohamed El-Deeb ◽  
...  
Keyword(s):  
Root Rot ◽  
Control Measure ◽  
Disease Incidence ◽  
Pathogenic Fungi ◽  
Pythium Ultimum ◽  
Control Measures ◽  
Infested Soil ◽  
Fungal Isolates ◽  
Cucumber Root

Five commercial composts were evaluated to suppress the root-rot pathogens (Fusarium solani (Mart.) App. and Wr, Pythium ultimum Trow, Rhizoctonia solani Kuhn, and Sclerotium rolfsii Sacc.) of cucumber plants under in vitro and greenhouse conditions. In vitro tests showed that all tested unautoclaved and unfiltrated composts water extracts (CWEs) had inhibitor effect against pathogenic fungi, compared to autoclaved and filtrated ones. Also, the inhibitor effects of 40 bacteria and 15 fungi isolated from composts were tested against the mycelial growth of cucumber root-rot pathogens. Twenty two bacteria and twelve fungal isolates had antagonistic effect against root-rot pathogens. The antagonistic fungal isolates were identified as 6 isolates belong to the genus Aspergillus spp., 5 isolates belong to the genus Penicillium spp. and one isolate belong to the genus Chaetomium spp. Under greenhouse conditions, the obtained results in pot experiment using artificial infested soil with cucumber root-rot pathogens showed that the compost amended soil reduced the percentage of disease incidence, pathogenic fungi population, and improved the cucumber vegetative parameters as shoot length, root length, fresh weight, and dry weight. These results suggested that composts are consequently considered as control measure against cucumber root-rot pathogens.

Adaptive responses to drought of two Retama raetam subspecies from Tunisia

2021 ◽  
Author(s):  
Ricardo GIL ◽  
Dhikra ZAYOUD ◽  
Zeineb OUERGHI ◽  
Monica BOSCAIU ◽  
Oscar VICENTE ◽  
...  
Keyword(s):  
Drought Stress ◽  
Glycine Betaine ◽  
Soluble Sugars ◽  
Co2 Concentration ◽  
Photosynthetic Parameters ◽  
Adaptive Responses ◽  
Retama Raetam ◽  
Physiological Adaptations ◽  
Use Efficiency ◽  
Desert Climate

Abstract Aims The survival and ecological distribution of plants in arid habitats are mainly conditioned by water availability and physiological adaptations to withstand drought. In the present study, we have compared the physiological responses to drought of two Retama raetam (retama) subspecies from Tunisia, one of them living under the desert climate (subsp. raetam) and the other one growing on the coast (subsp. bovei). Methods To physiologically characterize the two R. raetam subspecies, and to elucidate their main mechanisms underlying their tolerance to drought stress, parameters related to seed germination, growth, photosynthesis (net photosynthetic rate, intracellular CO2 concentration, transpiration rate, stomatal conductance and water use efficiency), and accumulation of osmolytes (proline, glycine betaine and soluble sugars) were determined in four-month-old plants subjected to stress for up to one month. Important findings Drought significantly inhibited germination, growth, and all the evaluated photosynthetic parameters. Plants of R. raetam subsp. bovei were severely affected by drought after three weeks of treatment when photosynthesis rates were up to 7-fold lower than in the controls. At the same time, proline and glycine betaine significantly accumulated compared to the irrigated controls, but much less than in R. raetam subsp. raetam; in the latter subspecies, proline and glycine betaine increased to levels 24-fold and 6-fold higher, respectively, than in the corresponding controls. In summary, the population living in the desert region exhibited stronger tolerance to drought stress than that adapted to the semiarid littoral climate, suggesting that tolerance in R. raetam is dependent on accumulation of osmolytes.

scholarly journals Taxonomic composition and incidence of phytopathogenic fungi on the roots of soft spring wheat in the Kansk-Krasnoyarsk forest-steppe

2021 ◽  
Vol 2 (44) ◽  
pp. 22-22
Author(s):  
Alexander Saakian ◽  
◽  
Keyword(s):  
Spring Wheat ◽  
Root Rot ◽  
Bipolaris Sorokiniana ◽  
Triticum Aestivum L ◽  
Wheat Root ◽  
Phytopathogenic Fungi ◽  
Taxonomic Composition ◽  
Forest Steppe ◽  
Root Infection ◽  
Fusarium Spp

The taxonomic composition and incidence of phytopathogenic fungi on the roots of soft spring wheat Triticum aestivum L. of nine varieties of Siberian origin (Altayskaya 70, Altayskaya 75, Krasnoyarskaya 12, Novosibirskaya 15, Novosibirskaya 16, Novosibirskaya 29, Novosibirskaya 31, Novosibirskaya 41 and Svirel) cultivated using wheat and fallow as a predecessor, was studied in the area of Kansk-Krasnoyarsk forest-steppe. Average incidence of fungal root infection was 24%. In plants grown using wheat as a predecessor, the incidence was statistically significantly (p <0.05) higher than in plants grown using fallow as a predecessor (27.3 versus 20.6%). Statistically significant (p <0.05) differences in the prevalence of root infection were revealed between cultivars. The maximal prevalence (33.3 and 32.3%, respectively) on average for the wheat predecessor and fallow was found for the varieties Svirel and Altayskaya 75, the minimal (16.7%) for the varieties Novosibirskaya 16 and Altayskaya 70. The complex of phytopathogenic fungi on the roots is represented by Fusarium spp., Bipolaris sorokiniana and Alternaria spp. (31.4, 44.9 and 23.7% of the pathogenic complex on average for varieties and variants, respectively). The composition of pathogens statistically significantly (p <0.01) depends on the predecessor. In the plants cultivated using wheat as a predecessor, the proportion of Alternaria spp. was higher whereas proportions of Fusarium spp. and Bipolaris sorokiniana were lower. No differences in prevalence and taxonomic composition of root infection between varieties originated from Novosibirsk territory, Krasnoyarsk territory and Altay territory were found. Keywords: SPRING WHEAT, ROOT ROT, KRASNOYARSK TERRITORY, FUSARIUM SPP., BIPOLARIS SOROKINIANA, ALTERNARIA SPP

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