Current Importance and Potential Use of Low Doses of Gamma Radiation in Forest Species
نویسنده
چکیده
It is well known that ionizing radiation is currently a very important way to create genetic variability that is not exists in nature or that is not available to the breeder (Ahloowalia & Maluszynski, 2001; Lemus et al., 2002). Therefore, there are many papers aimed to determine the best radiation dose to applied in plant breeding work. As a result it has been defined intervals gamma radiation useful for many cultivated species, though the determination of the radiosensitivity of tissues by exposure to different intensities of radiation (De la Fe et al., 1996; Castillo et al., 1997; Fuchs et al., 2002; Lemus et al., 2002; Fuentes et al., 2004; Ramírez et al., 2006). However, most studies have been conducted have been designed to evaluate the biological response to high doses of radiation, while in relatively few studies have used low doses to stimulate physiological processes (radiostimulation) although the ionizing radiation hormesis has been widely supported (Luckey, 1980). Hormesis is the excitation, or stimulation, by small doses of any agent in any sistem (Luckey, 2003). The beneficial effect of hormesis has been well documented in species of agricultural importance (Zaka et al., 2004; Kim et al., 2005). However, there is not enough information about its use in forestry. Although little is known about the basic nature of this phenomenon, Vaiserman (2010) had indicated the possible relationship between the hormesis and epigenetic effects. The application of low-dose ionizing radiation could produce in coniferous species hormetics radiostimulants effects through genetic and epigenetic changes that manifest as adaptive responses.
منابع مشابه
Modulating effects of melatonin, vitamin C and saffron alone or in combination on radiation induced cell lethality; an in vitro study with Hela cells
Introduction: Radiation countermeasures are defined as use of an agent to minimize the deleterious effects of radiation therapy by administering the compound after the radiation exposure has occurred, regardless of toxicity. In spite of extensive study in this field, yet there is no suitable radioprotector introduced. In this study two naturally occurring antioxidants were stu...
متن کاملRadioprotection by tempol: Studies on tissue antioxidant levels, hematopoietic and gastrointestinal systems, in mice whole body exposed to sub- lethal doses of gamma radiation
Background: Ionizing radiation induces the production of reactive oxygen species (ROS), which play an important causative role in cell death. Wholebody exposure of mice to gamma radiation leads to diminution of tissue antioxidant defense systems increases the peroxidative damage to membrane lipids and damages the haematopoietic and gastrointestinal systems. Tempol (TPL), a cell membranep...
متن کاملEffect of cimetidine and famotidine on survival of lethally gamma irradiated mice
Background: Currently available radioprotectors are poorly tolerated in man and the general use of aminothiols is compromised by their side effects. This study was carried out to test and compare the radioprotective potential of cimetidine and famotidine against lethally gamma irradiated NMRI mice. Materials and Methods: Adult male NMRI mice in groups of 10 were exposed to various doses of gamm...
متن کاملINF/IL-4 increases after the low doses of gamma radiation in BALB/c spleen lymphocytes
Introduction: The effects of the low dose of ionizing radiation are not thoroughly evident due to an unavoidable increase of occupational exposure and the widespread application of ionizing radiation in medical and industrial fields. The aim of this study was to investigate immune system responses following the low doses of ionizing radiation. Materia...
متن کاملاثرات پرتودهی گاما بر صفات جوانهزنی و بنیه بذر گیاه دارویی لگجی (Capparis spinosa var. parviflora)
In this study, the effect of different doses of gamma radiation was investigated on seed germination factors of Caper species. Gamma irradiation was performed using a cobalt-60 radiation with the radiation speed of 0.018 Gray/second and five doses of gamma radiation (0, 20, 40, 60 and 100 Gray) in a completely randomized design with 4 replication. The results showed that gamma radiation signifi...
متن کامل