Showing 116 results for Type of Study: Extentional
Keivan Karimi, Mahdi Arzanlou, Fariba Mirabi,
Volume 4, Issue 1 (3-2015)
Abstract
Karimi K., Arzanlou M. & Mirabi F. 2015. Barley scald disease. Plant Pathology Science 4(1):1-12.
Barley is one of the world`s most widely consumed cereal. Rhynchosporium commune, the causal agent of barley leaf scald, is one of the most deleterious pathogens of barley which can cause up to 40% yield loss, under favorable conditions. Primary infection takes place by spores produced on infected plant debris. The secondary infection can be repeated by spore dispersal by rain and wind. Although the teleomorphic stage is unknown, high levels of genetic diversity have been observed within and between populations of this pathogen, attributed to some mechanisms such as gene flow, parasexual cycle and asexual recombination. The management of this disease is mainly achieved through cultural and chemical measures of control and use of resistant cultivars. In this paper, different aspects of pathogen symptoms, taxonomy and biology of pathogen, and management of disease are discussed.
Rasool Rezaei,
Volume 4, Issue 1 (3-2015)
Abstract
Rezaei R. 2015. Pathogenicity and virulence factors of plant pathogenic bacteria. Plant Pathology Science 4(1):23-33.
Plant pathogenic bacteria have evolved specialized strategies to infect their hosts. In this regard, the key virulence factors are effector proteins, cell wall degrading enzymes, toxins, extracellular polysaccharides and phytohormones. The interactions between plant pathogenic bacteria and their hosts have resulted in an evolutionary system between host defense responses and pathogen virulence factors. Pathogenic bacteria are continually under pressure to diversify their mechanisms to prevent host defenses and optimize nutrient availability. In turn, these virulence mechanisms have shaped the evolution of plant innate immunity. In this paper, the pathogenicity and virulence factors of plant pathogenic bacteria are discussed.
mehdi Sadravi, Farzaneh Talaei,
Volume 4, Issue 1 (3-2015)
Abstract
Sadravi M. and Talaei F. 2015. Methods of mass production of inoculum of endomycorrhizal fungi. Plant Pathology Science 4(1):13-22.
Endomycorrhizae or arbuscular mycorrhizal fungi, play an important role in the life of field crops, flower and fruit gardens and vegetables. They increase nutrient uptake and yield of plants and resistance to soil-borne pathogens of plants as well. As these beneficial fungi, are obligate root symbiotic, mass production of their inoculum is only possible on the living tissue of root. The first method for this purpose was pot culturing, then the hydroponic, aeroponic and root organ culture have been devised. Methods and factors affecting the mass production of these beneficial fungi are described and discussed here.
Ali Baradar, Roohallah Saberi Riseh, Ebrahim Sedaghati, Abdolreza Akhgar,
Volume 4, Issue 1 (3-2015)
Abstract
Baradar A., Saberi Riseh R., Sedaghati E. & Akhgar A. 2015. Mycorrhiza helper bacteria.
Plant
Pathology Science 4(1):46-53.
Mycorrhizal fungi increase water and nutrient elements absorption to the plant and plant provide carbohydrates for the fungus and this is beneficial for both parties . Many plants need to these fungi for absorption some mineral elements and resistance to environmental stresses such as drought, soil contamination to heavy metals such as lead, zinc and cadmium. Some soil borne bacteria have been identified as third part of the mycorrhiza, which cause improving the performance of this symbiotic relationship, and have been named as mycorrhiza helper bacteria.
Zeinab Sharafi , Mehdi Sadravi,
Volume 4, Issue 1 (3-2015)
Abstract
Sharafi Z. & Sadravi M. 2015. Ten seed borne pathogenic fungi. Plant Pathology Science 4(1):34-45.
Most crops are propagated by seed. A large number of pathogenic fungi can transmitted by seed and cause epidemy of destructive plant diseases. Treatment of seeds has been shown to prevent plant disease epidemics caused by seedborne fungal pathogens. In this paper, morphological characteristics of ten pathogenic fungi belong to the genera, Alternaria, Aspergillus and Bipolaris, which can decay or reduce the germination of seeds or cause the brown leaf spot disease of cereals, has been described.
Farideh Farahbakhsh, Amir Massah,
Volume 4, Issue 2 (9-2015)
Abstract
Farahbakhsh F. & Massah A. 2015. Genetic of resistance to plant diseases. Plant Pathology Science 4(2):64-73.
With studying the function and co evolution of the plant resistance genes with virulence genes in the pathogens, the knowledge of molecular genetics is in progress and creates a new opportunity to produce durable resistance against plant diseases. This article explains the new findings about the different varieties of genetic resistance, performance and evolution of resistance genes involved in detecting, signaling and responding to plant pathogens.
Samaneh Fuladvand , Seyedeh Atefeh Hosseini ,
Volume 4, Issue 2 (9-2015)
Abstract
Fuladvand S. & Hosseini S.A. 2015. Fungi and fungal-like organisms vectors of plant viruses. Plant Pathology Science 4(2):53-63.
The fungi Olpidium brassica and O. boronovanus , and two fungal-like species, Polymyxa beta and P. graminis, are known as important vectors of plant viruses. All of these microorganisms are obligate parasite of root and transmit the viruses belong to at least 12 genera and four families of plant viruses. In this paper, these vectors and their life cycle, transmitted viruses, methods of the acquiring and transmission of them are described.
Zahra Tanha Maafi, Ramin Heidari,
Volume 4, Issue 2 (9-2015)
Abstract
Tanha Maafi Z. & Heidari R. 2015. Review on incidence of soybean cyst nematode in Iran. Plant Pathology Science 4(2):1-16.
Soybean cyst nematode, Heterodera glycines, is widespread in major soybean producing countries and is considered as the most suppressed agent of soybean yield in the world. This nematode was reported from northern Iran in 1999 for the first time. Presently SCN is widely distributed in Golestan and Mazandaran provinces and infestation rate is a remarkable showing broad range of infestation. In most fields, the population density is above the damage threshold level reported for this nematode in the literatures. The HG Type 0 (race 3) has been defined as the dominant type in the region and Katoul (DPX) is the only resistant cultivar to this type of SCN in Iran. Importance of soybean cyst nematode, distribution and severity of infection, nematode morphology, symptoms, race/Hg Type, life cycle, reaction of Iranian cultivars against the dominant SCN Hg Type in Iran, and its management, based on the researches conducted in Iran and in the world are presented in this paper.
Kaivan Karimi, Asadollah Babai-Ahari, Mahdi Arzanlou,
Volume 4, Issue 2 (9-2015)
Abstract
Karimi K., Babai-Ahari A. & Arzanlou M. 2015. Strawberry anthracnose disease. Plant Pathology Science 4(2):26-40.
Anthracnose disease is one of the most destructive diseases of strawberry which caused by Colletotrichum acutatum, C. gloeosporioides and C. fragariae. C. acutatum and C. gloeosporioides species complexes possess wider host range. According to the latest multi-gene phylogenetic evaluation, different strains of the causal agent of strawberry anthracnose disease which have been collected from different regions of the world, belong to these two species and are divided into several clusters, related to cryptic species. Despite infecting various parts of the plant, C. acutatum is mostly responsible for fruit rot and in comparison with two other species, causes crown rot and is more prevalent and destructive. Dispersal of pathogen inoculums mainly takes place by rain splash and sprinkler irrigation as well as by movement of human beings and animals. Integrated management of this disease is mainly achieved through cultural, chemical, biological and the use of resistant cultivars. Giving the importance of strawberry anthracnose disease in terms of damage rate and its recent incidence in many strawberry growing areas in Iran, different aspects of the disease, including diagnosis of the causal agent, biology and efficient management methods are discussed in the present review.
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Najmeh Gharacheh , Mehdi Sadravi,
Volume 4, Issue 2 (9-2015)
Abstract
Gharacheh N. & Sadravi M. 2015. Five important fungal diseases of pulse crops in Iran. Plant Pathology Science 4(2):17-25.
Bean, pea, lentil, vetch and broad bean grains are rich in protein. Kohgiluyeh and Boyer-Ahmad (a province in the southwest Iran) is one of the cultivation area of the pulses. In this province, five important fungal diseases included Fusarium wilt, Fusarium root rot, Ascochyta blight, Alternaria blight, and charcoal rot, are common on these plants. Symptoms of these diseases, key morphological characteristics of the pathogens and their distribution areas in Iran and the world is described.
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Cobra Moslemkhani, Javad Mozafari,
Volume 5, Issue 1 (2-2016)
Abstract
Moslemkhani K. & Mozafari J. 2016. Management of bacterial wilt disease of potato by health assay of seed tubers. Plant Pathology Science 5(1): 62-75.
Ralstonia solanacearum is an important phytopathogen which reduces quantity and quality of potato. Due to its wide distribution and broad host range and in soil of different regions through irrigation water or latent infected tubers. It is generally difficult to control the damage of this bacterium. It has widely distributed in most of potato growing regions of Iran and by causing wilt and brown rot disease of potato, is a serious treat for cultivation of this crop in the country. Providing and sowing the healthy and certificated seed tubers is the most effective method of controlling the disease. For a successful strategy of disease management, a clear understanding of mode of disease distribution and epidemiology of causal agent is necessary. In this paper, recent scientific findings on this disease are described and new methods of bacterium detection and health assay of seed tubers are introduced.
Mehdi Sadravi, Mahya Rahimizadeh,
Volume 5, Issue 1 (2-2016)
Abstract
Sadravi M. & Rahimizadeh M. 2016. Ten useful Penicillium species. Plant Pathology Science 5(1):1-13.
Penicillium species have saprophytic live on plants debris, in the soil and also on some plant products, fresh and juicy damaged fruits as well as the storage fruit and grains. They can characterized by studying the features of their colony, conidiophores, phialids and conidia on selective culture media. The ability of some isolates of P. aurantiogriseum, P. bilaiae, P. chrysogenum, P. citrinum, P. funiculosus, P. glabrum, P. griseofulvum, P. oxalicum, P. purpurogenum and P. simplicissimum to control plants diseases such as Fusarium and Verticillium wilt of tomato, pulse white and gray molds, brown rot and blight twig of peach, late blight and cyst of potato has been proved. They also can act as plant growth promoter. Key morphological characteristics of these ten species of Penicillium is described in this paper. Most of these species are reported from Iran, thus identification and use of the efficient isolates of them can be suggested in management of plants diseases or in enhancement of plants growth programs.
Amir Ramzani, Dr Safarali Mahdian,
Volume 5, Issue 1 (2-2016)
Abstract
Ramezani A. & Mahdian S. A. 2016. Biological control of post-harvest citrus diseases. Plant Pathology Science 5(1):14-25.
Post- harvest rot of citrus fruits is one of the most important limiting factors that reduce the life of harvested products and are one of the most important economical diseases in world’s citrus production areas. Two most important fungi that affect the citrus fruits, are green and blue molds which are produced by Penicillium digitatum and P. italicum, respectively. The disease are mainly managed by using the synthetic fungicides, but because of environmental hazards and appearance of resistant strains of the pathogen, the biological control by the use of bacterial, fungal and yeast antagonists can be suggested. The efficiency of yeasts such as Candida guilliermondii, C. saitoan, Pichia guilliermondi and Aureobasidium pullulans; the bacteria Pseudomonas fluorescens, Bacillus subtilis, Pantoea agglomerans and the fungus Muscodor albus, in controlling the green and blue molds of citrus is reported so far. In this paper, we tried to explain the method of biological control with emphasizing on the identification of useful microorganisms and their operation.
Leila Sadeghi, Salar Jamali,
Volume 5, Issue 2 (8-2016)
Abstract
Sadeghi L. & Jamali S. 2016. Molecular plants defense mechanisms against nematodes. Plant Pathology Science 5(2):90-100.
Plant parasitic nematodes can devastate a wide range of crop plants. They are obligate parasites and have evolved compatible parasitic relationship with their host plants to obtain nutrients that are necessary to support their development and reproduction. Suppression of host defense is a key step for pathogenesis in the compatible interaction. Plant defense response is activated from the moment a nematode penetrates the plant root. Stylet and secretions of esophageal glands play central roles at during invasion to host, migration inside the roots and establishment of feeding site on host cells. New findings demonstrate that secretions of esophageal glands of some nematodes as effectors deliver into the apoplast and cytoplasm of host cells to active plant defense responses in resistant host. Molecular plants defense mechanisms against nematodes described in this paper.
Faegheh Etminani, Adibeh Etminani, Behrouz Harighi,
Volume 5, Issue 2 (8-2016)
Abstract
Etminani F., Etminani A. & Harighi B. 2016. Role of endophytic bacteria in sustainable agriculture. Plant Pathology Science 5(2):71-80.
Food security is one of the most challenges in the world. This problem is more important in regions with unsuitable agricultural system conditions. Use of chemical pesticides to protect crops against plant pathogens and insects has been increasing over the last decades. Chemical fertilizers increase the yield but usually reduce soil fertility and harm to environment. Therefore, application of endophytic bacteria as alternative fertilizers can be used in sustainable agriculture without affecting environment. Endophytic bacteria use various mechanisms to enhance plant growth such as nitrogen fixation, solubilization of phosphate, production of phytohormones like auxin, cytokinin and gibberellin, production of Hydrogen cyanide and Siderophore as an antimicrobial compounds to control of soilborne disease and increasing plant resistance to abiotic disorders. Knowledge about endophytic bacteria- plant interaction can provide effective strategy to develop sustainable agriculture in order to ensure yield improvement without affecting environment.
Somayeh Mousavi, Mahdi Arzanlou,
Volume 5, Issue 2 (8-2016)
Abstract
Mousavi S. & Arzanlou M. 2016. Cercospora leaf spot disease of sugar beet. Plant Pathology Science 5(2):13-22.
Cercospora leaf spot disease is one of the most important foliar diseases of sugar beet. Over one third of the sugar beet cultivation areas of the world has been affected by this disease. Cercospora beticola is the causal agent of this disease and a high level of interspecific variation of its morphology and genetics has been reported. Disease management is mainly achieved by a combination of cultural practices, cultivation of resistant varieties and application of fungicides. Due to the economic importance of the disease in Iran, some of the different aspects of Cercospora leaf spot disease, including the introduction of disease as well as the biology of the fungus, disease cycle and the efficient measures of disease management, has been reviewed in this paper.
Maryam Khezri,
Volume 5, Issue 2 (8-2016)
Abstract
Khezri M. 2016. Biofilm formation in probiotic bacterium Bacillus subtilis. Plant Pathology Science 5(2):52-62.
Most bacteria have a common ability to form communities known as biofilm. They are varied in structure and function, but have some similarities in general properties. The main compounds of biofilms are extracellular polysaccharides. The probiotic Bacillus subtilis is a gram-positive, rod-shape, endospore-forming and soil inhabiting bacterium that has many agricultural use, such as plant growth promoting activity and biocontrol potential against many of phytopathogens. Biofilm formation is an important microbial survival strategy that enables microorganisms to stay together for long time. Biofilm can protect the bacteria against unfavorable conditions, like antibiotics, chemical pesticides and biocide components. Capability of biofilm formation in probiotic B. subtilis plays significant role in root colonization and biological control of plant pathogens.
Leila Motieeian, Mehdi Nasr Esfahani,
Volume 5, Issue 2 (8-2016)
Abstract
Motieeyan L. & Nasr-Esfahani M. 2016. Management method of sugar beet cyst nematode. Plant Pathology Science 5(2):32-41.
Sugar beet, is one of the basic source of the raw material for sugar industry in Iran. The beet cyst nematode, Heterodera schachtii Schmidt, 1871, is one of the most damaging pathogens of sugar beet. This nematode has a wide host range, including 218 plant species from 95 genus and 23 families, which include some of the important field crops, ornamental plants and weeds. Nematode management methods include avoiding of cultivation in highly infested soils, disease scape by early cultivation, crop rotation, using resistant varieties, application of bioagents, applying of organic fertilizers, animal manure, plant waste materials, compost, vermicompost and also soil solarization and chemical control are described here.
Abolfazl Narmani, Mahdi Arzanlou,
Volume 6, Issue 1 (2-2017)
Abstract
Narmani A. & Arzanlou M. 2017. Grapevine Esca disease. Plant Pathology Science 6(1): 12-21.
Esca is one of the most important and destructive diseases of grapevines worldwide, decreasing growth and yield in all stages of growth. Phaeoacremonium minimum is known as the main fungal species associated with disease, worldwide and its pathogenicity on grapevines have been documented by several studies in Iran. In the vineyards, infected plant material, soil and reproductive material are the main sources of inoculums. Pruning wounds are the main route for entrance of pathogen and infection. Seasonal and environmental factors such as stress and damage caused by freezing are effective on the symptom developed. Disease management strategies are mainly preventive with pruning and elimination of infected organs and treatment of pruning wounds with fungicides have been suggested.
Banafsheh Safaiefarahani, Reza Mostowfizadeh-Ghalamfarsa,
Volume 6, Issue 1 (2-2017)
Abstract
Safaiefarahani B. & Mostowfizadeh-Ghalamfarsa R. 2017. Phytophthora spp. interspecific hybrids and their danger for agriculture. Plant Pathology Science 6(1): 33-46.
Interspecific hybridization is an important evolutionary process contributing to adaptation and speciation. During the last decade, advances in the molecular taxonomy techniques have led to increasing the number of descriptors interspecific hybrids in the genus Phytophthora. In Phytophthora hybrids, inheriting and recombining genes from both parents may result in increased aggressiveness and broader host range compared with either parent. Some Phytophthora natural hybrids have also been reported in Iran to date. Consequently, identification, pathogenicity and host range tests of these hybrids as well as preventing the formation of new hybrids before experiencing large economic losses are recommended for management of plant diseases caused by this fungal-like organisms.
