Mutualistic fungal endophytes produce phytohormones and organic acids that promote japonica rice plant growth under prolonged heat stress

Waqas, Muhammad; Khan, Abdul Latif; Shahzad, Raheem; Ullah, Ihsan; Khan, Abdur Rahim; Lee, In‐Jung

doi:10.1631/jzus.b1500081

Cited by 75 publications

(33 citation statements)

References 32 publications

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“…In our study, we described a much higher production for the same species. Waqas [60] described IAA production by P. formosus at 34.07 ± 3.92 µg mL −1 , a result very similar to the findings of this study, and consequently, a plant growth-promoting effect. Nevertheless, Waqas [61] analyzed the variability of IAA production as a function of the culture medium used and conversely found that P. variotii had virtually undetectable phosphatase activity.…”

Section: Discussionsupporting

confidence: 90%

Paecilomyces variotii as A Plant-Growth Promoter in Horticulture

et al. 2020

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In the present study, P. variotii, an endophytic fungus isolated from plant roots from the Cabo de Gata Natural Park (Parque Nacional Cabo de Gata—Spain), was tested to determine the effect on the growth promotion of tomato and pepper seeds and seedlings. For these purposes, germination trials in a laboratory and two experiments in a commercial nursery and greenhouse conditions were performed. The P. variotii isolate has shown a high ability to produce siderophores and IAA, but low ability to solubilize P. High values for germination percentage, seedling vigor, root and shoot length were obtained by P. variotii on tomato and pepper against control. P. variotii applications resulted in improved most of the growth parameters evaluated, for both horticultural crops, with the best results in the development of pepper seedlings. The application of a higher dose of P. variotii improved most of the morphological parameters and the Dickson quality index (DQI) value in tomato in seedlings and plants. The establishment of the endophytic fungus at the root enabled its biostimulant effects to persist after transplantation without any additional application. Few studies have analyzed this species as a biostimulant. The positive results from the tests showed its high potential. The application of this isolate can be of enormous benefit to horticultural crops for its high reproductive and establishment capacity.

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Section: Discussionsupporting

confidence: 90%

Paecilomyces variotii as A Plant-Growth Promoter in Horticulture

et al. 2020

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“…It can be used directly or indirectly as a potential biostimulant. When used directly, Paecilomyces or its metabolites increases the plant morphological parameters and crop yield [ 15 , 34 , 35 , 36 , 37 ]. The plant– Paecilomyces interaction improves plant health through different mechanisms and provides protection from phytopathogens [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

Paecilomyces and Its Importance in the Biological Control of Agricultural Pests and Diseases

Moreno-Gavíra

Huertas

Diánez

et al. 2020

Plants

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Incorporating beneficial microorganisms in crop production is the most promising strategy for maintaining agricultural productivity and reducing the use of inorganic fertilizers, herbicides, and pesticides. Numerous microorganisms have been described in the literature as biological control agents for pests and diseases, although some have not yet been commercialised due to their lack of viability or efficacy in different crops. Paecilomyces is a cosmopolitan fungus that is mainly known for its nematophagous capacity, but it has also been reported as an insect parasite and biological control agent of several fungi and phytopathogenic bacteria through different mechanisms of action. In addition, species of this genus have recently been described as biostimulants of plant growth and crop yield. This review includes all the information on the genus Paecilomyces as a biological control agent for pests and diseases. Its growth rate and high spore production rate in numerous substrates ensures the production of viable, affordable, and efficient commercial formulations for agricultural use.

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“…The latter may suggest more competition between these fungal pathogens and Xoo in healthy or asymptomatic leaves. However, nonpathogenic strains of Fusarium, Aspergillus, and Phialemoniopsis have been assessed for antagonistic activities against plant pathogens including F. oxysporum, Colletotricum gloeosporioides, and Sclerotium rolfsii (Tayung and Jha, 2010;Waqas et al, 2015;Mastan et al, 2019). Therefore, it may be worthwhile to further isolate and determine the identity and virulence of these fungal strains.…”

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confidence: 99%

Bacterial Blight Induced Shifts in Endophytic Microbiome of Rice Leaves and the Enrichment of Specific Bacterial Strains With Pathogen Antagonism

Yang

Zhang

et al. 2020

Front. Plant Sci.

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The endophytic microbiome plays an important role in plant health and pathogenesis. However, little is known about its relationship with bacterial blight (BB) of rice caused by Xanthomonas oryzae pv. oryzae (Xoo). The current study compared the community compositional structure of the endophytic microbiota in healthy and BB symptomatic leaves of rice through a metabarcoding approach, which revealed BB induced a decrease in the alpha-diversity of the fungal communities and an increase in the bacterial communities. BB-diseased rice leaves were enriched with saprophytic fungi that are capable of decomposing plant cell walls (e.g. Khuskia spp. and Leptosphaerulina spp.), while healthy rice leaves were found to be significantly more abundant with plant pathogens or mycotoxin-producing fungi (e.g. Fusarium, Magnaporthe, and Aspergillus). The endophytic bacterial communities of BB-diseased leaves were significantly enriched with Pantoea, Pseudomonas, and Curtobacterium, strains. Pantoea sp. isolates from BB leaves are identified as promising candidates for the biocontrol of BB for their ability to inhibit in vitro growth of Xoo, suppress the development of rice BB disease, and possess multiple PGP characteristics. Our study revealed BB-induced complexed changes in the endophytic fungal and bacterial communities of rice leaves and demonstrated that BB-associated enrichment of some endophytic bacterial taxa, e.g. Pantoea sp. isolates, may play important roles in suppressing the development of BB disease in rice.

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Mutualistic fungal endophytes produce phytohormones and organic acids that promote japonica rice plant growth under prolonged heat stress

Cited by 75 publications

References 32 publications

Paecilomyces variotii as A Plant-Growth Promoter in Horticulture

Paecilomyces variotii as A Plant-Growth Promoter in Horticulture

Paecilomyces and Its Importance in the Biological Control of Agricultural Pests and Diseases

Bacterial Blight Induced Shifts in Endophytic Microbiome of Rice Leaves and the Enrichment of Specific Bacterial Strains With Pathogen Antagonism

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