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Sphaerotheca fuliginea on Zinnia elegans. a-c Symptoms of powdery mildew on leaves and stem of the plant showing white mycelium to tissue necrosis.
Source publication
Five powdery mildew fungi: Phyllactinia guttata, Podosphaera xanthii, Erysiphe quercicola, Odium sp. and Sphaerotheca fuliginea on Populus sp., Ageratum conyzoides, Quercus sp., Aegle marmelos and Zinnia elegans respectively, have been collected from Himachal Pradesh, India during a phytopathological survey from September – December, 2013. Detailed...
Citations
... The field evaluations of genotypes were conducted at the research farm of Eternal University, Baru Sahib, Himachal Pradesh, India, spanning three consecutive growing seasons (2020-21, 2021-2022, and 2022-23). The Baru Sahib PM disease nursery research farm in situated in a north Indian hilly state, Himachal Pradesh, and is known for climatic conditions favorable for the natural infection, growth, and the development of PM [82]. ...
... The fungal morphology i.e. anamorphic and telomorphic characters were identical to those observed on initially diseased leaves. The symptoms produced by P. xanthii on A. conyzoides were also in agreement with those of Mukhtar et al. (2013), Gautam (2015) and Mukhtar and van Peer, (2017). ...
... To the best of our knowledge, scanning of literature revealed that this is the first ever report of telomorphic stage of powdery mildew fungus, P. xanthii on A. conyzoides from India and elsewhere. Earlier anamorph of P. xanthii was only recorded from Himachal Pradesh, India (Gautam 2015). The anamorphic stage of P. xanthii on A. conyzoides had also been reported by Mukhtar et al. (2013) from Lahore, Pakistan and Mukhtar and van Peer (2017) from Fuzhou, China. ...
... It is estimated that about 100 species of powdery mildews belonging to genera Arthrocladiella, Blumeria, Erysiphe, Farmanomyces, Leveillula, Microsphaera, Oidopsis, Oidium, Phyllactinia, Pleochaeta, Podosphaera, Sphaerotheca, Uncinula and Uncinuliella (Jamaluddin et al. 2004;Paul andThakur 2006, Hosagoudar andAgarwal 2009) are reported so far from Himachal Pradesh. This paper is in continuation with our previous studies on some powdery mildews from Himachal Pradesh, India (Gautam 2014(Gautam , 2015. During the routine mycological surveys in the district Mandi of Himachal Pradesh, some powdery mildew were found infecting different species of higher plants viz.: Pseudoidium cryptolepidis on Cryptolepis buchanani, Erysiphe trifoliorum on Trifolium repentis, Podosphaera xanthii Coreopsis lanceolata and Podosphaera euphorbiae-hirtae on Euphorbiae-hirta. ...
... During the routine mycological surveys in the district Mandi of Himachal Pradesh, some powdery mildew were found infecting different species of higher plants viz.: Pseudoidium cryptolepidis on Cryptolepis buchanani, Erysiphe trifoliorum on Trifolium repentis, Podosphaera xanthii Coreopsis lanceolata and Podosphaera euphorbiae-hirtae on Euphorbiae-hirta. The literature consulted (Bilgrami et al. 1991;Jamaluddin et al. 2004;Paul and Thakur 2006;Hosagoudar and Agarwal 2009;Braun and Cook 2012;Gautam 2014Gautam , 2015, revealed that no record of these fungi were from Himachal Pradesh. These are illustrated and described here in this study. ...
Gautam AK, Avasthi S. 2017. Short Communication: Some additions to powdery mildews (Erysiphales: Fungi) of Northwestern Himalayas. Nusantara Bioscience 9: 52-56. During the regular mycological collections, between October to December 2015 in NorthWest Himalayas of Himachal Pradesh, four powdery mildews parasitic on higher plants were gathered. After study they were found to be Pseudoidium cryptolepidis on Cryptolepis buchanani, Erysiphe trifoliorum on Trifolium repentis, Podosphaera xanthii on Coreopsis lanceolata and Podosphaera euphorbiae-hirtae on Euphorbia hirta. All the powdery mildew fungi are additions to Himachal Pradesh as well as northwest Himalayas.
Powdery mildew (PM), caused by the fungal pathogen Blumeria graminis f. sp. tritici (Bgt), significantly threatens global bread wheat production. Although the use of resistant cultivars is an effective strategy for managing PM, currently available wheat cultivars lack sufficient levels of resistance. To tackle this challenge, we conducted a comprehensive genome-wide association study (GWAS) using a diverse panel of 286 bread wheat genotypes. Over three consecutive years (2020–2021, 2021–2022, and 2022–2023), these genotypes were extensively evaluated for PM severity under field conditions following inoculation with virulent Bgt isolates. The panel was previously genotyped using the Illumina 90K Infinium iSelect assay to obtain genome-wide single-nucleotide polymorphism (SNP) marker coverage. By applying FarmCPU, a multilocus mixed model, we identified a total of 113 marker–trait associations (MTAs) located on chromosomes 1A, 1B, 2B, 3A, 3B, 4A, 4B, 5A, 5B, 6B, 7A, and 7B at a significance level of p ≤ 0.001. Notably, four novel MTAs on chromosome 6B were consistently detected in 2020–2021 and 2021–2022. Furthermore, within the confidence intervals of the identified SNPs, we identified 96 candidate genes belonging to different proteins including 12 disease resistance/host–pathogen interaction-related protein families. Among these, protein kinases, leucine-rich repeats, and zinc finger proteins were of particular interest due to their potential roles in PM resistance. These identified loci can serve as targets for breeding programs aimed at developing disease-resistant wheat cultivars.
Unscrupulous human activities have imposed some serious problems on earth right from global warming to environmental pollution. A high time has reached to take some serious actions against these devastating activities in order to save our planet from any further deterioration. A quantum of research has already been done to figure out some simple and cost effective measures to tackle these problems. In order to achieve these goals, many techniques are being employed among which use of microbial agents and their products is gaining widespread popularity. Microorganisms are both beneficial and hazardous to flora and fauna in different aspects, so it entirely depends upon us to discriminate between them and thereby to figure out the beneficial strains. Among the various beneficial microbial agents, the bacterium Pseudomonas fluorescens is showing some promising role. In last few decades, plenty of work has been done on application of the bacterium in various sectors viz., sewage water treatment, bioremediation, biofilters construction, treatment of petroleum wastes and many more. The use of this bacterium is not limited only towards combating environmental pollution but it has shown a potential role in the agriculture sector as well. It has been widely used for the preparation of bio-fertilizers as many strains of P. fluorescens have tremendous ability of dissolving the phosphate in the soil which is generally present in complex form and is not readily available to the plant. In addition to it, the bacterium has been used even for the production of bio-herbicide and bio-pesticides for controlling weeds and phytopathogens which makes it a successful PGPR overall. Application of the bacterium as a biocontrol agent enables to reduce the annual global consumption of various hazardous chemicals which generally impose some serious threats to environment as well as to human health. Overall it may be stated that P. fluorescens have got multifarious applications and this chapter will briefly deal with certain such invention discovered in the recent decade.
