Mechanizmy chroniace rosline przed stresem oksydacyjnym, wywolanym niekorzystnymi warunkami srodowiska

• Autorzy: Lata B
• Języki publikacji: PL

Abstrakty

EN

Like other organisms, the plants are continually exposed in their environment to a wide range of different stresses, originated from human activities (air pollutants, acid rain, xenobiotics) or having natural causes such as drought, low or high temperature, high light intensities and nutrient deficiency. A common feature of various biotic and abiotic stress factors is their potential to increase the production of reactive oxygen species (ROS) in plant tissues. ROS are also generated in plant cells during normal metabolic functions. Free radicals are highly reactive chemically and can induce extensive degradation of membrane lipids, proteins and DNA. The ability of a plant to reduce the harmful effects of free radical determines its tolerance to such a stress. To prevent such damages the plants have developed antioxidative system composed of non-enzymic antioxidants such as glutathione, vitamin C (ascorbate) and E (α-tocopherol) as well as protective enzymes (e.g. superoxide dismutase, ascorbate peroxidase, glutathione reductase ). The problem of yield decrease in crop species grown und er stress conditions has focused the attention on metabolic mechanisms and substances differentiating plant susceptibility to injuries caused by various environmental stresses.

Słowa kluczowe

PL

czynniki biotyczne; warunki srodowiska; stres oksydacyjny; czynniki abiotyczne; przeciwutleniacze; czynniki stresowe; rosliny

• Wydawca: -
• Czasopismo: Postępy Nauk Rolniczych
• Rocznik: 1998
• Tom: 45
• Numer: 6
• Opis fizyczny: s.115-132,tab.,rys.,bibliogr.

Twórcy

autor

Lata B

• Szkola Glowna Gospodarstwa Wiejskiego, ul.Nowoursynowska 166, 02-787 Warszawa

Bibliografia

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