Hi every one I need more information about how low temperature can affect oxidative stress parameters in fresh water fish
bet regards
Safia Habila
Interesting question Safia..
Extreme Temperature Responses, Oxidative Stress and Antioxidant Defense in Plants (DOI: 10.5772/54833)
The cellular changes induced by either high temperature or low temperature include responses those lead to the excess accumulation of toxic compounds, especially reactive oxygen species (ROS). The end result of ROS accumulation is oxidative stress]. In response to high temperature the reaction catalyzed by ribulose-1,5-bisphosphate carboxylase oxygenase (RuBisCO) can lead to the production of H2O2 as a consequence of increases in its oxygenase reactions . On the other hand, LT conditions can create an imbalance between light absorption and light use by inhibiting the activity of the Calvin–Benson cycle. Enhanced photosynthetic electron flux to O2 and over-reduction of the respiratory electron transport chain (ETC) can also result in ROS accumulation during chilling which causes oxidative stress. Plants have evolved a variety of responses to extreme temperatures those minimize damages and ensure the maintenance of cellular homeostasis. A considerable amount of works have explored that there is a direct link between ROS scavenging and plant stress tolerance under temperature extremes . Thus, the improvement of temperature stress tolerance is often related to enhanced activities of enzymes involved in antioxidant systems of plants. Plants exposed to extreme temperatures use several non-enzymatic and enzymatic antioxidants to cope with the harmful effects of oxidative stress; higher activities of antioxidant defense enzymes are correlated with higher stress tolerance. Different plant studies have revealed that enhancing antioxidant defense confers stress tolerance to either high temperature or low temperature stress .
Like annual crops, perennial crops are also sensitive to extreme temperature. Fruits and nut trees are important crop plants which often face extreme temperature stress induced damages. Every fruit tree species has a range of optimum temperatures above or below which the growth and yield markedly reduced. The mean temperatures range for optimum growth of most tropical fruits are about 24-30°C . For instance, mango (Mengifera indica) tree can tolerate high temperature up to 48°C only for a certain period of time , on the contrary it has only partial tolerance to low temperature In another study, Schaffer et al. observed that monoembryonic mango cultivars tend to be more low temperature tolerant than polyembryonic cultivars . However, several studies have shown that low temperature promote reproductive morphogenesis in mango. Dinesh and Reddy studied the responses of fruit trees to temperature and observed differential responses to temperature in different fruit species. They concluded that lychee and longan require a warm sub-tropical to tropical climate that is cool but also frost-free or with only very slight winter frosts not below -4°C, and with high summer heat, rainfall, and humidity. In longan, stressful temperatures of
The best way to study this is to simulate a cold condition on the fish environment while working with a control in a normal environment. Indicators of oxidative stress can then be measured.
Hi
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Dear Safia,
I think, Antioxidant enzyme activities may be very low, So the oxidative stress level may be high ...
I would like to thank all of you ,
After a a deep research, I found that the low temperature increase oxygen solubility leading to the increase of ROS production (Abele and Puntarulo, 2004; Vinagre et al., 2012).
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