5 results on '"Ahmadi, Mehrzad"'
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2. Phenotypic and Molecular Identification of Green Pea Powdery Mildew Pathogen from Alborz, Iran
- Author
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TAHERİ ARDESTANİ, Simin, KHODAPARAST, Aliakbar, ABBASİ MOGHADAM, Ahmad, and AHMADİ, Mehrzad
- Subjects
Fen ,Pisum sativum ,Erysiphe pisi ,rDNA ,ITS dizi analizleri ,Science ,ITS sequence analyses - Abstract
Bezelye (Pisum sativum.), dünya çapında protein, vitamin ve besin açısından zengin, önemli bir tüketilebilir sebze ürünüdür. İran'ın birçok yerinde özellikle yaz mevsiminde ve son zamanlarda örtülü seralarda yetiştirilmektedir. Külleme, yeşil bezelyenin özellikle bakla doldurma ve olgunlaşma aşamasında önemli bir hastalığıdır ve yaprakların fotosentetik alanını azaltarak ürün kaybına neden olur. Bu deney, 2021 yılında İran genetik departmanı ve ulusal bitki gen bankası, tohum ve bitki ıslah enstitüsünde yeşil bezelye koleksiyonunun rejenerasyonu altındaki bazı çeşitlerde külleme ile ilişkili mantarları belirlemek için yapılmıştır. Temmuz sonundan ağustos ayına kadar bitkiler bakla aşamasındadır. Başlangıçta yaprak üzerinde dallara, baklalara ve gövdelere doğru ilerleyen beyaz, unlu yamaların oluşumu, duyarlı erişimlerde bitkilerin en hava kısmını kapsadığı gözlendi. Erysiphe pisi, Erysiphe trifolii ve Erysiphe baeumleri'nin bezelyede hastalığa neden olduğu bildirilmiştir. Enfekte bitki örnekleri toplandı ve morfolojik çalışmalar için laboratuvara aktarıldı, ardından genomik DNA izole edildi ve dahili transkripsiyonlu ayırıcılar (ITS) bölgeleri kullanılarak amplifikasyon ve sekanslama için kullanıldı. Eşeysiz ve eşeyli evrelerin morfolojik özelliklerine ve ayrıca rDNA-ITS sekans analizlerine dayanarak, mantar Erysiphe pisi olarak tanımlandı. Bu hastalığa karşı yüksek düzeyde dirençli çeşitlerin varlığından dolayı, bu ilde dayanıklı çeşitler üretmek için daha fazla araştırma yapılması önerilir., Green pea (Pisum sativum.) is an important consumable vegetable crop worldwide rich in protein, vitamins, and nutrition. It is cultivated in many parts of Iran, particularly during the summer season, and recently under protected greenhouse. Powdery mildew is an important disease of green pea, especially during the pod fill and maturation stage and decreases the photosynthetic area of leaves which causes crop loss. This experiment was conducted in order to identify fungi associated with powdery mildews on some accessions under regeneration of green pea collection at the genetic department and national plant gene bank of Iran, seed, and plant improvement institute during the year 2021. Powdery mildew became epidemic on the plants at the pod stage from the end of July to August. The formation of white, floury patches initially on the leaf progressing towards tendrils, pods, and stems observed that on susceptible accessions covered the most aerial part of the plants. The Erysiphe pisi, Erysiphe trifolii and Erysiphe baeumleri were reported causing disease on pea. The infected plant samples were collected and transferred to the lab for morphological studies, then, the genomic DNA was isolated and used for amplification and sequencing using the internal transcribed spacers (ITS) regions. Based on morphological characteristics of asexual and sexual stages as well as rDNA-ITS sequence analyses, the fungus was identified as Erysiphe pisi. Due to the presence of accessions with high levels of resistance to this disease, further investigation is recommended to breed resistant cultivars for cultivation in this province.
- Published
- 2022
3. Identification of Fungi Associated with Different Pigeon Pea Seed Accessions from Iran
- Author
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TAHERİ ARDESTANİ, Simin, ABBASİ MOGHADAM, Ahmad, AHMADİ, Mehrzad, and TALAEİ, Zahra
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Fen ,Science ,Cajanus cajan ,Alternaria spp ,Aspergillus spp ,Fusarium spp ,Penicillium spp ,Rhizopus spp - Abstract
Leguminosae familyasının bir türü Cajanus cajan (L.) Millsp'dir. (Güvercin bezelyesi) otsu, yıllık, kendine tozlanan baklagil bitkisidir. Güvercin bezelyesi, besleyici kalitesi ve iyi bir mineral ve protein kaynağı nedeniyle esas olarak Güney Asya'nın birçok ülkesinde yetiştirilmektedir. Tohumlar, hastalıkların yayılması için birincil kaynak görevi gören bitki patojenlerinin ortak bir taşıyıcısıdır. Kirlenmiş tohumlar genellikle dışkılanmış çimlenme ve zayıf fide canlılığı yaratabilir. Kirlenmemiş tohumlardan çok daha hızlı canlılık kaybederler. Çok sayıda mikofloranın güvercin bezelye tohumlarıyla ilişkili olduğu bildirildi. Bazı güvercin bezelye katılımlarının tohum sağlığını ve kalitesini değerlendirmek için, bu deney İran'ın genetik departmanı ve ulusal bitki gen bankası, tohum ve bitki geliştirme enstitüsünde 2021 yılında yapılmıştır. Denemede güvercinden toplam 52 katılım yapılmıştır. laboratuvar testleri için bezelye koleksiyonları kullanıldı. Bu çalışma sırasında Alternaria spp., Aspergillus spp., Fusarium spp., Penicillium spp. ve Rhizopus spp.'nin farklı türleri. kontamine güvercin bezelyesinin filizlenen tohumları ve fideleri ile birlikte bulundu. Kontamine güvercin bezelye tohumları üzerinde en fazla tespit edilen tür %50 ile Rhizopus spp., en az ise Alternaria spp. ve %7.2 ile Aspergillus spp. Diğer türler Penicillium spp. ve Fusarium spp., kontamine tohumların sırasıyla %21.4 ve %14.2'sinde ölçülmüştür. Kirlenmiş güvercin bezelye tohumlarında, tohum çimlenmesinde %20 ila %100 azalma ölçülmüştür. Tohum sağlığına dikkat etmek, sürdürülebilir mahsul üretimi ve tohumların korunması için hastalığın entegre yönetimi için temel stratejidir., A species of Leguminosae family is Cajanus cajan (L.) Millsp. (Pigeon pea) is an herbaceous, annual, self-pollinated legume pulse crop. The pigeon pea is mainly cultivated in many countries of South Asia due to its nutritious quality and a good source of minerals and protein. Seeds are a common carrier of plant pathogens, which act as the primary source for the distribution of diseases. Contaminated seeds can often create defecated germination and poor seedling vigour. They lose viability much faster than non-contaminated seeds. A large number of mycoflora were reported to be associated with the pigeon pea seeds. To assess the seed health and quality of some pigeon pea accessions this experiment was conducted at the genetic department and national plant gene bank of Iran, seed, and plant improvement institute in 2021. In the experiment, a total of 52 accessions from the pigeon pea collection were used for laboratory tests. During this study different species of Alternaria spp., Aspergillus spp., Fusarium spp., Penicillium spp., and Rhizopus spp. were found along with germinating seed and seedlings of contaminated pigeon pea. The most identified species on the contaminated pigeon pea seeds were Rhizopus spp., with 50%, and the least were Alternaria spp. and Aspergillus spp., with 7.2%. The other species Penicillium spp., and Fusarium spp., were measured on 21.4% and 14.2% of the contaminated seeds respectively. On contaminated pigeon pea seeds, 20 to 100% reduction in seed germination has been measured. Paying attention to seed health is the fundamental strategy for the integrated management of the disease for durable crop production and seed conservation.
- Published
- 2022
4. Evaluation of Adaptation and Sustainabilit of Winter Oilseed Rape Mutant Lines in Cold and Mild Cold Regions of Iran by GGE Biplot Method.
- Author
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Ahmadi, Mehrzad, Omidi, Mansoor, Alizadeh, Bahram, and Bushehri, Ali Akbar Shah Nejat
- Abstract
Introduction Oilseed rape is the third most important oil crop in the world after oil palm and soybean. The world's oilseed rape production was 4.6 million tons in 2018-2019 and has the ability to compensate for the lack of edible oil in Iran (containing 40-45% oil). The production of this crop is mainly done by using two zero cultivars with a low level of glucosinolate in the feed and the absence of Erucic acid in the oil. Two types of oilseed rape are cultivated in Iran, spring and autumn. Spring type is cultivated in warm regions of the Caspian Sea coast and southern regions of the country and its autumn type is mostly cultivated in cold and mild cold regions. Materials and Methods In this study 16 rapeseed mutant lines obtained through Gama radiation of three rapeseed cultivars Talaye, Zarfam and Express with 800, 900 and 1200 gray dose rates, followed by 7 selfing generation, are compared during two years for earliness, seed and oil yield and other important agronomic traits in four regions Karaj, Kermanshah, Esfahan and Zarghan with three check varieties. The oil content of rapeseed varieties and lines were determined by NMR (nuclear magnetic resonance) at chemic laboratory of Oilseed Crops Research Department of Seed and Plant Improvement Institute. Finally, the highest yield early maturity lines were defined. Each treatment was sown in plot with four rows, four meters lenght and 30 cm between row distances. The experimental field was prepared in late summer and chemical fertilizer were given to it. The sowing experiment were planned for late week of September until the first week of October.At the end of each cropping year, the yield of each plot was harvested separately and the statistical calculations were carried out after the gathering of two years results by GGE biplot method. Results and Discussion Results of combined ANOVA showed that main effects of year and genotype, interaction of location xgenotype; year x location, and interaction of year, location and genotype had significant effects on grain yield. The genotypes showed the highest and the lowest grain yield in Kermanshah 4016 kg/ha and Zarghan 2886 kg/ha stations, respectively. Line T-900-4 produced the highest grain yield 3840 kg/ha in all locations. To study the interaction of genotypes and environments, GGE biplot method was used. Based on the polygonal graphs related to genotypes, line Z-800-6, Z-900-7, Okapi and Z-800-3 produced the highest yield in Karaj, Zarghan, Kermanshah and Esfahan, respectively. Regarding the imaginary ideal genotype graph and biplot of genotypes and environments and seed yield ranking, line Z-900-7 were identified as the best genotypes due to its higher yield and stability. Conclusion In Iran, 70% of rapeseed production is done in warm regions and only 30% in cold regions. Therefore, breeding cold-tolerant cultivars by using mutations will increase rapeseed cultivation in the cold region of Iran. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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5. Study of QTLs linked to awn length and their relationships with chloroplasts under control and saline environments in bread wheat
- Author
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Masoudi, Bahram, primary, Mardi, Mohsen, additional, Hervan, Eslam Majidi, additional, Bihamta, Mohammad Reza, additional, Naghavi, Mohammad Reza, additional, Nakhoda, Babak, additional, Bakhshi, Behnam, additional, Ahmadi, Mehrzad, additional, Tabatabaei, Mohammad Taghi, additional, and Firouzabadi, Mohamad Hossein Dehghani, additional
- Published
- 2018
- Full Text
- View/download PDF
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