Occurrence of Pythium Rot of Chinese Cabbage in Egypt and its Biocontrol Measures

El-Mohamedy, R. S. R.; El-Mougy, Nehal S.

doi:10.2478/v10045-009-0050-0

Cited by 4 publications

(3 citation statements)

References 39 publications

(37 reference statements)

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“…There are several reports of Trichoderma and Pseudomonas mediated growth promotion and development of seedlings of several vegetable crops, namely tomato, lettuce, cabbage, and chilli (Rabeendran et al 2000;Bal & Altintas 2006;Joshi et al 2010;Ordookhani et al 2010;Tanwar et al 2010). Apart from improving nutritional status and growth of various vegetable crops, there are several reports of their use as biocontrol agent against a wide range of soil borne fungal pathogens of crucifers (Cheah et al 2000;Rabeendran et al 2005;El-Mohamedy & El-Mougy 2009;El-Mohamedy 2012).…”

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confidence: 99%

Interactive effect of AM fungi with Trichoderma viride and Pseudomonas fluorescens on growth and yield of broccoli

Tanwar¹,

Aggarwal²,

Kaushish³

et al. 2013

Plant Prot. Sci.

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Tanwar Most of the vegetable crops are known to depend upon arbuscular mycorrhizal fungal (AM) symbiosis for growth and development, since AM fungi provide nutrients and water in exchange for photosynthates. The influences of AM fungi (glomus intraradices (G) and Acaulospora laevis (A)) with Trichoderma viride (T) and Pseudomonas fluorescens (P) alone and in combinations on growth, mycorrhization, chlorophyll content, nutrient uptakes, and yield of broccoli plants were studied in pot culture under glasshouse conditions. The obtained results demonstrated that the single inoculation of broccoli plants with T. viride significantly increased the above ground fresh weight, root length, chlorophyll b, head diameter, root phosphorus, and shoot nitrogen in comparison to uninoculated control plants. On the other hand, consortium of G+A+T+P significantly increased plant height, above ground dry weight, root fresh weight, chlorophyll a, head fresh weight, and root nitrogen content. Similarly, G+T showed maximum leaf area, and P alone showed maximum uptake of shoot phosphorus. Whereas when P was supplied along with T, early flowering was recorded. AM fungal colonisation was negligible and only root tips were found infected in G or A treated plants which confirms low dependency of broccoli on AM fungi.

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confidence: 99%

Interactive effect of AM fungi with Trichoderma viride and Pseudomonas fluorescens on growth and yield of broccoli

Tanwar¹,

Aggarwal²,

Kaushish³

et al. 2013

Plant Prot. Sci.

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“…ciceris or R. solani linear outgrowth has inhibited by chitosan, hydroquinone, and salicylic acid (Wade and Lamondia, 1994;Sarwar et al, 2005;Veladi et al, 2013). Chitosan has been consistent several of antimicrobial actions towards several plant pathogens (Benhamou, 2004;Badawy et al, 2005;El-Mohamedy et al, 2013). Chitosan also can permeabilize the Neurospora crassa fungus' plasma membrane and it leads to inhibition of cells growth (Palma-Guerrero et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

Plant defense activation and down-regulation root rot and wilt in chickpea diseases by some abiotic substances

Zian,

El-Blasy,

El-Gendy

et al. 2023

E3S Web of Conf.

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Rhizoctonia solani in addition to Fusarium oxysporum f. sp. ciceris have been recorded the most closely related fungi to root rotted as well as wilted chickpea plants assembled from various locations in Ismailia Governorate, Egypt. In the pathogenicity tests, all isolates were capable of infecting chickpea plants cv. Giza 2 and caused signs of root rot in addition to wilt diseases to variable degrees. The isolate of Rhizoctonia solani number 4 with accession No. (OR074128) and F. oxysporum isolate number 3 with accession No. (OR074126 ) were the more virulent ones. In the present study, abiotic substances viz hydroquinone, salicylic acid, benzoic acid, and chitosan were evaluated compared with Topsin M-70® fungicide for controlling these diseases under in vitro in addition to in vivo conditions. The application of abiotic substances demonstrated fungicidal action was inhibited the mycelia outgrowth of the two examined fungi by varying degrees. Chitosan was the greatest efficacy accompanied by hydroquinone and salicylic acid. In the pots and field experiments, all treatments significantly decreased root rot in addition to wilt diseases incidence consequently raised the number of survival plants. The highest protection from the infection of both the tested pathogenic fungi occurred under chitosan treatment followed by hydroquinone and salicylic acid. showed the best increase over the control, hydroquinone came next followed by salicylic acid. In physiological aspects, the activities of defense-related enzymes, exactly (peroxidase “PO”, polyphenol oxidase “PPO”, total phenol content “TPC”) and photosynthetic pigments enhanced in all abiotic substances applications as contrasted with untreated inoculated plants in addition to untreated uninoculated plants.

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“…Most plants are colonized by fungi, protists, and other microbes that may contribute to the ecological distributions of LAB in the phyllosphere. For example, many fungi can live in the phyllosphere of cabbages as pathogens (81,82), and the phyllosphere yeast Rhodotorula is known to cause defects in fermented vegetable products (83,84). Future work should determine the contributions of these other microbes in the phyllosphere and fermentation microbiome assembly process.…”

Section: Discussionmentioning

confidence: 99%

Establishment Limitation Constrains the Abundance of Lactic Acid Bacteria in the Napa Cabbage Phyllosphere

Miller

Kearns

Niccum

et al. 2019

Appl Environ Microbiol

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Patterns of phyllosphere diversity have become increasingly clear with high-throughput sequencing surveys, but the processes that control phyllosphere diversity are still emerging. Through a combination of lab and field experiments using Napa cabbage and lactic acid bacteria (LAB), we examined how dispersal and establishment processes shape the ecological distributions of phyllosphere bacteria. We first determined the abundance and diversity of LAB on Napa cabbage grown at three sites using both culture-based approaches and 16S rRNA gene amplicon sequencing. Across all sites, LAB made up less than 0.9% of the total bacterial community abundance. To assess whether LAB were low in abundance in the Napa cabbage phyllosphere due to a limited abundance in local species pools (source limitation), we quantified LAB in leaf and soil samples across 51 vegetable farms and gardens throughout the northeastern United States. Across all sites, LAB comprised less than 3.2% of the soil bacterial communities and less than 1.6% of phyllosphere bacterial communities. To assess whether LAB are unable to grow in the phyllosphere even if they dispersed at high rates (establishment limitation), we used a gnotobiotic Napa cabbage system in the lab with experimental communities mimicking various dispersal rates of LAB. Even at high dispersal rates, LAB became rare or completely undetectable in experimental communities, suggesting that they are also establishment limited. Collectively, our data demonstrate that the low abundance of LAB in phyllosphere communities may be explained by establishment limitation. IMPORTANCE The quality and safety of vegetable fermentations are dependent on the activities of LAB naturally present in the phyllosphere. Despite their critical role in determining the success of fermentation, the processes that determine the abundance and diversity of LAB in vegetables used for fermentation are poorly characterized. Our work demonstrates that the limited ability of LAB to grow in the cabbage phyllosphere environment may constrain their abundance on cabbage leaves. These results suggest that commercial fermentation of Napa cabbage proceeds despite low and variable abundances of LAB across different growing regions. Propagule limitation may also explain ecological distributions of other rare members of phyllosphere microbes.

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Occurrence of Pythium Rot of Chinese Cabbage in Egypt and its Biocontrol Measures

Cited by 4 publications

References 39 publications

Interactive effect of AM fungi with Trichoderma viride and Pseudomonas fluorescens on growth and yield of broccoli

Interactive effect of AM fungi with Trichoderma viride and Pseudomonas fluorescens on growth and yield of broccoli

Plant defense activation and down-regulation root rot and wilt in chickpea diseases by some abiotic substances

Establishment Limitation Constrains the Abundance of Lactic Acid Bacteria in the Napa Cabbage Phyllosphere

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