مقالههای Ahad Yamchi
توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقالههای نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده میشوند.
۱Differential response of parent and advanced mutant lines of wheat (Triticumaestivum L. cv. Tabasi) genotypes in antioxidant activity to salinity stress atseedling stage
اطلاعات انتشار: دومین همایش یافته های نوین در محیط زیست و اکوسیستم های کشاورزی، سال ۱۳۹۴
تعداد صفحات: ۲۸
Effect of sodium chloride salinity was studied in advanced mutant lines T–65–7–1 and T–67–60 (tolerant) and their wild type Tabasi (moderately tolerant) wheat genotypes under control and level of salinity (EC 6 ds m–1) at seedling stage. Salinity treatment decreased the contents of chlorophyll (CHL), carotenoids (CAR), ?–Tocopherol (TOC) as well as enzyme activities including catalase (CAT), superoxide dismutase(SOD), ascorbic acid (AA), ascorbate peroxidase (APOX), and glutathione reductase (GR), whereas increased the contents of superoxide ion (O2–), hydrogen peroxide (H2O2), thiobarbituric acid reactive material (TBARM) (measuring of lipid peroxidation) in wild type Tabasi cultivar. Salinity tolerant mutant line T–67–60 showed more enzymatic activities (CAT, SOD, ASA, APOX, GR) as well as CHL, CAR and TOC contents than T–65–7–1 mutant line and Tabasi cultivar. Interestingly, the contents of O2 –, H2O2 and TBARM in T–67–60 line showed less increased than T– 65–7–1 line and Tabasi cultivar by salinity treatment. Base on these results the tolerance of T–67–60 mutant line to salinity, justified by intensified enzyme activitiesto control oxidative damage via quench ROS levels<\div>
۲Evaluation of genetic diversity among Iranian pomegranate (Punica granatum L.) cultivars, using ISSR and RAPD markers
اطلاعات انتشار: تاكسونومي و بيوسيستماتيك، سال ۱۳۹۰
تعداد صفحات: ۱۰
Considering the high level of morphological diversity in Iranian pomegranate cultivars, comparison of genetic variation among 24 pomegranate cultivars was evaluated using random amplified polymorphic DNA (RAPD) and inter simple sequence repeat (ISSR) markers. RAPD primers amplified 131 DNA fragments among which 29 were polymorphic (22.14%) and ISSR markers produced 173 amplification products, out of which 64 were polymorphic (37%). Mean PIC (polymorphic information content) was 0.128 for RAPD and 0.163 for ISSR. The results suggested that the ISSR markers produced much better reproducible bands and were more efficient in grouping cultivars. Pairwise similarity index values ranged from 0.353 to 1.0 (RAPD), 0.291 to 0.930 (ISSR) and mean similarity index values of 0.604 and 0.674 for RAPD and ISSR, respectively. The analysis of molecular variance (AMOVA) for RAPD and ISSR data showed no significant differences among the geographical regions and juice acidity of the used cultivars (P>0.05) indicated that genetic and geographic distances were not correlated
اطلاعات انتشار: Journal of Plant Molecular Breeding، سوم،شماره۲، ۲۰۱۵، سال ۰
تعداد صفحات: ۱۲
Under osmotic stresses, proline accumulation is an important response of plants to these conditions. Proline is a compatible osmolyte which affects many cellular and molecular aspects of plant in both normal and stressful situations. Proline is shown to be involved in plant development in normal condition and in conferring resistance to plant under biotic and abiotic stresses. Therefore, many surveys have already been designed to unveil its mechanisms and signaling pathway, so that it might be an insight into resolving growing challenge of agriculture, drought and soil salinity. Δ1–pyrroline–5–carboxylate synthetase (P5CS), one of two main enzymes in proline biosynthesis pathway from glutamate precursor, has been demonstrated to play significant role in proline accumulation in plants under water stresses. Regarding the role of P5CS under osmotic stress, there are controversial observations in various plants, hence making it still unknown, whether P5CS is rate–limiting enzyme in the pathway or not. Obviously, transgene P5CS is proved to give higher resistance to transgenic plants under drought and salinity, by elevating proline content. In this literature, proline and its identified various functions in plants, characteristics of P5CS enzyme, signals, inducers and inhibitors of P5CS gene, expression pattern of P5CS under differential conditions in studied plant species are discussed. Finally, we have reviewed generated transgenic plants overexpressing P5CS and consequences of these transformations.
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