Yazar "Ali, Muhammad Amjad" seçeneğine göre listele

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    Characterization of potato golden cyst nematode populations (globodera rostochiensis) in Turkey
    (Friends Science Publ, 2020) Toktay, Halil; Evlice, Emre; İmren, Mustafa; Özer, Göksel; Ali, Muhammad Amjad; Dababat, Abdelfattah
    Golden potato cyst nematode, Globodera rostochiensis (Wollenweber) Behrens, is one of the most important soilborne pathogens causing economic losses in potato. The nematode is known to occurin several countries including Turkey and has a worldwide regulatory concern. In this study, identification and genetic diversity of G. rostochiensis specimens obtained from the main potato producing areas of Turkey were determined. Twenty -five of 35 soil samples collected from the provinces of Izmir, Nevsehir and Nigde were found to contain G. rostochiensis. The variation between G. rostochiensis populations was determined when examined according to ecological and pathogenic characteristics of nematode in Turkey. The cysts of G. rostochiensis were identified by measuring the morphological characters using perennial patterns, vulval cone, vulval basin and juveniles. Phylogenetic analysis of the Large Sub Unit (LSU) region of rDNA sequences was used to assess the inter or intra phylogenetic relationships between the nematode populations. The phylogenetic analyses demonstrated that the nematode specimens from Turkey cluster with Globodera spp. and signified the presence of single species of G. rostochiensis. As a result, morphological, morphometric and molecular methods were successfully combined for identification and characterization of G. rostochiensis. The frequency of G. rostochiensis in regulatory samples frompotato -producing areas is becoming increasingly important. The morphological characterization has several complications in the detection of this quarantine nematode, using of this combination is beneficial for a reliable and quick diagnostic for these nematodes which is crucial for regulatory services and growers. The results might help to investigate different ecotypes of G. rostochiensis for comprehensive understanding about physiology, ecology , and biology of the genus Globodera for its effective management in Turkey. (C) 2020 Friends Science Publishers
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    Genetic resistance of wheat towards plant-parasitic nematodes: current status and future prospects
    (Field Crops Central Research Institute, 2021) Seid, Awol; İmren, Mustafa; Ali, Muhammad Amjad; Toumi, Fateh; Paulitz, Timothy; Dababat, Abdelfattah A.
    Plant-parasitic nematodes (PPNs) are one of the major biotic factors that cause significant yield losses in wheat-growing areas worldwide. The major PPN groups causing significant economic losses in wheat quantity and quality are cereal cyst nematodes (CCNs) and root-lesion nematodes (RLNs). Based on their wide distribution, pathogenicity, high occurrence in wheat cultivated areas, they are considered major threats to the global food supply. The economic loss caused by these destructive pathogens ranges from 10 to 100% depending on different agro-ecological conditions such as drought, heat stress, and cold stress. Multidisciplinary management practices are being implemented to manage cereal nematodes (CNs) that range from cultural to molecular strategies. Integration of wheat resistant varieties with appropriate agronomic practices is recognized as the safest and most practical, effective, and applicable management strategy. Nine resistance genes (Cre1–Cre9) to CCN are well-documented in the literature. CreR, CreV and CreZ genes are relatively recently characterized from wheat and confer resistance to CCNs. On the other hand, Rlnn1 is the only resistance gene characterized from wheat that is known to confer resistance towards RLNs. However, breeding for resistance to PPN has numerous challenges that originate from the narrow genetic diversity and difficulty in the process of transferring resistance gene(s) from the source to the target variety. A unique opportunity for wheat genetic improvement was provided due to the availability of genomic resources and the wheat worldwide germplasm collection which includes wild wheat germplasm. Moreover, the presence of several genome-wide association studies and genome editing technologies could also help for further improvement to enhance CNs resistance in wheat. This article provides the latest information regarding the progress made in the identification and characterization of resistance genes from different sources and its utility against both CCNs and RLNs, which will attract the attention of the scientific community and other relevant stakeholders. © 2021, Field Crops Central Research Institute. All rights reserved.
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    Genome and transcriptome-wide analyses of cellulose synthase gene superfamily in soybean
    (Elsevier GmbH, 2017) Nawaz, Muhammad Amjad; Rehman, Hafiz Mamoon; Baloch, Faheem Shehzad; Ijaz, Babar; Ali, Muhammad Amjad; Khan, Iqrar Ahmad; Lee, Jeong Dong
    The plant cellulose synthase gene superfamily belongs to the category of type-2 glycosyltransferases, and is involved in cellulose and hemicellulose biosynthesis. These enzymes are vital for maintaining cell-wall structural integrity throughout plant life. Here, we identified 78 putative cellulose synthases (CS) in the soybean genome. Phylogenetic analysis against 40 reference Arabidopsis CS genes clustered soybean CSs into seven major groups (CESA, CSL A, B, C, D, E and G), located on 19 chromosomes (except chromosome 18). Soybean CS expansion occurred in 66 duplication events. Additionally, we identified 95 simple sequence repeat makers related to 44 CSs. We next performed digital expression analysis using publically available datasets to understand potential CS functions in soybean. We found that CSs were highly expressed during soybean seed development, a pattern confirmed with an Affymatrix soybean IVT array and validated with RNA-seq profiles. Within CS groups, CESAs had higher relative expression than CSLs. Soybean CS models were designed based on maximum average RPKM values. Gene co-expression networks were developed to explore which CSs could work together in soybean. Finally, RT-PCR analysis confirmed the expression of 15 selected CSs during all four seed developmental stages. © 2017 Elsevier GmbH