کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2179500 | 1095055 | 2013 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of NH4-N concentrations and gradient redox level on growth and allied biochemical parameters of Elodea nuttallii (Planch.)
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effects of NH4-N concentrations and gradient redox level on growth and allied biochemical parameters of Elodea nuttallii (Planch.) Effects of NH4-N concentrations and gradient redox level on growth and allied biochemical parameters of Elodea nuttallii (Planch.)](/preview/png/2179500.png)
چکیده انگلیسی
Aquatic plants frequently encounter multiple stresses under natural conditions. Nuttall's water weed, Elodea nuttallii (Planch.) is a submerged aquatic macrophyte which has flexible ability to use different nutrient sources from various environments. However, recently the growth of E. nuttallii has been declining in waters of Japan and in the Chesapeake Bay, a large estuary in the United States. In the present experiment, we studied growth and survival capabilities of the plant under a gradient of redox conditions; from highly oxic (+400 to +440Â mV) to extremely reduced (â180 to â120Â mV) conditions. Reduced environment was prepared by adding glucose to growth medium and nitrogen gas bubbling, while the oxic environment was brought about by atmospheric air bubbling. In comparison to the oxic environment, growth rate and carbon-nitrogen content of the plants were significantly affected negatively at hypoxic and anoxic conditions. In hypoxic and anoxic environments, indole acetic acid (IAA), tissue nitrogen and chlorophyll levels were down-regulated, whereas hydrogen peroxide (H2O2), indole acetic acid oxidase (IAAO) and peroxidase (POD) levels were up-regulated. It was also found that high NH4-N concentrations (10-40Â ppm) affect the growth rate and biochemical parameters of the plant; however, in hypoxic and anoxic treatments the effects were more severe. We conclude that E. nuttallii is poorly tolerant to hypoxia/anoxia. Moreover, oxygen stress combined with high ammonium concentration act as important factors influencing distribution and abundance of this species.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Flora - Morphology, Distribution, Functional Ecology of Plants - Volume 208, Issue 3, March 2013, Pages 211-219
Journal: Flora - Morphology, Distribution, Functional Ecology of Plants - Volume 208, Issue 3, March 2013, Pages 211-219
نویسندگان
Tanjeena Zaman, Takashi Asaeda,