A procedure for the establishment of Glomus mosseae in dual culture with Ri T-DNA-transformed carrot roots

Mycorrhiza ◽  
1997 ◽  
Vol 7 (2) ◽  
pp. 57-61 ◽  
Author(s):  
David D. Douds Jr.
Keyword(s):  
Glomus Mosseae ◽  
Dual Culture ◽  
Transformed Carrot Roots

Some studies relating to "independent" growth of vesicular–arbuscular endophytes

1988 ◽  
Vol 66 (12) ◽  
pp. 2533-2540 ◽  
Author(s):  
Barbara Mosse
Keyword(s):  
Bacterial Contamination ◽  
Dual Culture ◽  
Mycorrhizal Infection ◽  
Fungal Development ◽  
Extramatrical Mycelium ◽  
Vesicular Arbuscular ◽  
Transformed Carrot Roots ◽  
Nutrient Conditions

In dual culture with Ri T-DNA transformed carrot roots nutrient conditions were sought that would totally suppress mycorrhizal infection while stimulating "independent" growth of vesicular–arbuscular endophytes. In this system fungal development in the agar was comparable in extent with that normally occurring only after mycorrhizal infection has become well established; it differed qualitatively from that characteristic of germinating spores and extramatrical mycelium in such cultures. There was profuse development of arbuscule-like branches, many anastomoses, and increased branching of extension hyphae. Biomass increased up to fivefold when the mycelium was detached in situ from the inoculum (root pieces or spores). Growth from explants was little more than residual and was hampered by extensive bacterial contamination at the desired pH, near neutrality. The rationale of this approach to the culture of vesicular–arbuscular endophytes is discussed.

An Attempt at Biological Control of Blossom Blight of Rose Caused by Botrytis cinerea Using some Local Trichoderma spp. Strains

2020 ◽  
Vol 55 (1) ◽  
pp. 27-34
Author(s):  
G. Zadehdabagh ◽  
K. Karimi ◽  
M. Rezabaigi ◽  
F. Ajamgard
Keyword(s):  
Botrytis Cinerea ◽  
Mycelial Growth ◽  
Limiting Factor ◽  
Dual Culture ◽  
Trichoderma Spp ◽  
Khuzestan Province ◽  
Inhibitory Potential ◽  
Cut Rose

The northern of Khuzestan province in Iran is mainly considered as one of the major areas of miniature rose production. Blossom blight caused by Botrytis cinerea has recently become a serious limiting factor in rose production in pre and post-harvest. In current study, an attempt was made to evaluate the inhibitory potential of some local Trichoderma spp. strains against B. cinerea under in vitro and in vivo conditions. The in vitro results showed that all Trichoderma spp. strains were significantly able to reduce the mycelial growth of the pathogen in dual culture, volatile and non-volatile compounds tests compared with control, with superiority of T. atroviride Tsafi than others. Under in vivo condition, the selected strain of T. atroviride Tsafi had much better performance than T. harzianum IRAN 523C in reduction of disease severity compared with the untreated control. Overall, the findings of this study showed that the application of Trichoderma-based biocontrol agents such as T. atroviride Tsafi can be effective to protect cut rose flowers against blossom blight.

scholarly journals Trichoderma asperellum T76-14 Released Volatile Organic Compounds against Postharvest Fruit Rot in Muskmelons (Cucumis melo) Caused by Fusarium incarnatum

2021 ◽  
Vol 7 (1) ◽  
pp. 46
Author(s):  
Warin Intana ◽  
Suchawadee Kheawleng ◽  
Anurag Sunpapao
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Cucumis Melo ◽  
Fungal Growth ◽  
Fruit Rot ◽  
Postharvest Disease ◽  
Dual Culture ◽  
Trichoderma Asperellum ◽  
Volatile Organic

Postharvest fruit rot caused by Fusarium incarnatum is a destructive postharvest disease of muskmelon (Cucumis melo). Biocontrol by antagonistic microorganisms is considered an alternative to synthetic fungicide application. The aim of this study was to investigate the mechanisms of action involved in the biocontrol of postharvest fruit rot in muskmelons by Trichoderma species. Seven Trichoderma spp. isolates were selected for in vitro testing against F. incarnatum in potato dextrose agar (PDA) by dual culture assay. In other relevant works, Trichoderma asperellum T76-14 showed a significantly higher percentage of inhibition (81%) than other isolates. Through the sealed plate method, volatile organic compounds (VOCs) emitted from T. asperellum T76-14 proved effective at inhibiting the fungal growth of F. incarnatum by 62.5%. Solid-phase microextraction GC/MS analysis revealed several VOCs emitted from T. asperellum T76-14, whereas the dominant compound was tentatively identified as phenylethyl alcohol (PEA). We have tested commercial volatile (PEA) against in vitro growth of F. incarnatum; the result showed PEA at a concentration of 1.5 mg mL−1 suppressed fungal growth with 56% inhibition. Both VOCs and PEA caused abnormal changes in the fungal mycelia. In vivo testing showed that the lesion size of muskmelons exposed to VOCs from T. asperellum T76-14 was significantly smaller than that of the control. Muskmelons exposed to VOCs from T. asperellum T76-14 showed no fruit rot after incubation at seven days compared to fruit rot in the control. This study demonstrated the ability of T. asperellum T76-14 to produce volatile antifungal compounds, showing that it can be a major mechanism involved in and responsible for the successful inhibition of F. incarnatum and control of postharvest fruit rot in muskmelons.

Lysis and biological control of Aspergillus niger by Bacillus subtilis AF 1

1996 ◽  
Vol 42 (6) ◽  
pp. 533-538 ◽  
Author(s):  
A. R. Podile ◽  
A. P. Prakash
Keyword(s):  
Biological Control ◽  
Bacillus Subtilis ◽  
Aspergillus Niger ◽  
Fungal Growth ◽  
Dry Weight ◽  
Crown Rot ◽  
Fungal Mycelium ◽  
Infested Soil ◽  
Dual Culture ◽  
Bacterial Cells

A biocontrol rhizobacterial strain of Bacillus subtilis AF 1 grown for 6 h was coinoculated with Aspergillus niger at different time intervals and microscopic observations revealed adherence of bacterial cells to the fungal mycelium. Bacterial cells multiplied in situ and colonized the mycelial surface. Growth of AF 1 resulted in damage to the cell wall, followed by lysis. AF 1 inoculation into media containing A. niger at 0, 6, and 12 h suppressed >90% fungal growth, while in 18- and 24-h cultures fungal growth inhibition was 70 and 56%, respectively, in terms of dry weight. In dual culture the fungal growth was not accompanied by formation of spores. The mycelial preparation of A. niger as principal carbon source supported the growth of B. subtilis, as much as chitin. Extracellular protein precipitate from B. subtilis culture filtrate had a significant growth-retarding effect on A. niger. Groundnut seeds bacterized with B. subtilis showed a reduced incidence of crown rot in A. niger infested soil, suggesting a possible role of B. subtilis in biological control of A. niger.Key words: mycolytic bacteria, Bacillus subtilis, Aspergillus niger, biological control.

Surface-sterilization of Glomus mosseae sporocarps for studying endomycorrhization in vitro

Mycorrhiza ◽  
1999 ◽  
Vol 9 (2) ◽  
pp. 65-68 ◽  
Author(s):  
S. W. Budi ◽  
S. Gianinazzi ◽  
B. Blal
Keyword(s):  
Glomus Mosseae ◽  
Surface Sterilization

Transition Experiences of Indian Nurses Into Australian Mental Health System

2021 ◽  
pp. 104365962110263
Author(s):  
Bindu Joseph ◽  
Michael Olasoji ◽  
Cheryl Moss ◽  
Wendy Cross
Keyword(s):  
Mental Health ◽  
Thematic Analysis ◽  
Mental Health System ◽  
Methodological Approach ◽  
Hermeneutic Phenomenology ◽  
Dual Culture ◽  
The Past ◽  
Transition Experience ◽  
Depth Interview ◽  
Insight Into

Introduction: In the past decade, there has been an influx of migrant nurses from India to Australia. Migrant professionals have specific transition needs associated with working in Mental Health (MH). This study aimed to explore the transition experience of overseas trained nurses from India working in Australian MH settings. Method: Hermeneutic phenomenology was the methodological approach used in the study. The participants ( N = 16) were overseas trained nurses from India. Data were collected through in-depth interview and analysed using thematic analysis. Results: The findings resulted in the identification of the following themes: (1) Living in dual culture, (2) Loneliness, (3) Discrimination, and (4) Feeling incomplete. Discussion: It is evident that the transition to work in MH in Australia was a journey of mixed experiences. While certain findings of this study are comparable with experiences of migrant nurses in other settings, it provides insight into those that are working in MH.

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