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Articles by Farkhondeh REZANEJAD
Total Records ( 2 ) for Farkhondeh REZANEJAD
  Farkhondeh Rezanejad
  The growth and differentiation of the angiosperms embryo and suspensor occur in a series of interdependent stages and follow a specific pattern. Within the nucellus, a single cell differentiates into a megasporocyte (megaspore mother cell), which gives rise to megagametophyte. In this study, buds and pods were collected in different developmental stages and examined. Ovules are sites of megasporogenesis and megagametogenesis and following fertilization, develop into seeds. Ovules of Spartium junceum are bitegmic and anatropous. The steps of embryo development comprise globular, heart and cotyledonary embryo. In the stage of cotyledonary embryo, the shoot apex, cotyledons, hypocotyle, protoderm and the root apex are obvious. Suspensor is 4-5 ranked and obvious during globular, transition and early heart embryo stages. At late heart embryo stage, it is elongated and eventually degenerated. During embryo development, nucellus and endosperm contents decrease.
  Farkhondeh REZANEJAD
  Phenolic compounds function as stress indicators because they accumulate to high levels in many plant tissues in response to a wide range of biotic and abiotic signals. These compounds are involved in pollen development, pollination, pollen germination, and pollen tube growth. The mature pollen grains of Spartium junceum L., Lagerstroemia indica L., Thuja orientalis L., and Petunia hybrida L. collected from control (less polluted) and polluted areas [mainly SO2, NO2, CO, hydrocarbons (HC), and airborne particulate material (APM)]. The ethanolic aquatic extracts of pollen grains were prepared. The extracts were analysed by high pressure liquid chromatography (HPLC). HPLC analysis demonstrated that air pollution induces flavonoids accumulation to significantly higher levels in the polluted pollen of Spartium junceum, Lagerstroemia indica, and Thuja orientalis than in the controls. In Petunia hybrida the flavonoids level increased more slightly in the pollen grains exposed to air pollutants compared to controls.
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