Hormetic effect of Gamma rays on Pinus pseudostrobus Lindl. seed
DOI:
https://doi.org/10.12899/asr-2401Keywords:
Gamma Ray, Conifers, Photosynthetic Pigment, Hormesis.Abstract
Pinus pseudostrobus Lindl. is one of the most used conifer species in reforestation projects. However, it presents some problems with the viability of its seeds. Although the usefulness of the radiostimulant effect of gamma rays in processes such as germination and growth of forest species has been demonstrated, there is no information available on this species. For this reason, it was proposed to evaluate the "hormetic effects" of low doses (0.5, 1.5, 3.0, 5.0, and 7.5 Gy) of gamma rays (60Co Theratron 780E Unit) on germination capacity, seedling growth, and chlorophyll content in this species. The results showed that all doses (0.5, 1.5, 3.0, 5.0, and 7.5 Gy) improved germination percentage, but not seedling growth. The highest germination percentage was recorded at 61.53 percent with the 0.5 Gy dose, while the gamma doses of 1.5 and 3.0 Gy ranked second with 53.84%. The height and diameter of seedlings from 0, 0.5, 1.5, and 3.0 Gy irradiated seeds did not show significant differences. However, as the dose increases, the stress generates a decrease in growth. The photosynthetic pigment content was lower at doses of 0.5 and 1.5 Gy (Ch a= 0.35, Ch b = 0.15, Ch a+b = 0.50, Car = 0.18). This study is important because it shows that the stimulatory effects of low gamma doses on germination and seedling growth may not be the same.
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