Study on radiosensitivity and range selection of stimulant X-ray doses in four tomato (Lycopersicon esculentum Mill) varieties
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Abstract
Lignon, INCA 9-1, Tropical Mallac-10 and Campbell 28 were
exposed to X-rays source (0-800 Gy) to determine the
radiosensitivity and interval of stimulant doses for these
varieties. The X-rays source used was a superficial therapy
source with a work regime of 55 KV and 30 mA for a dose
power of 11.47 Gy/min. The percentage of seed germination
was evaluated after seven days and root length, seedling
height and stem diameter after 15 days. Seedling survival was
determined after 15 days too; regression equations between
the applied X-rays doses and radiosensitivity parameter
evaluated were established, determining 50 % reduction
seedling height doses and the mean lethal dose. Results
showed intervals of doses by regions for each variable and
variety studied with higher differences in the radiostimulation,
transition and radioinhibition regions. Doses between 5-75 Gy
had a radiostimulant effect on seedling height while those
between 5-25 Gy on root length. Doses between 5-25 Gy were
recommended for productive practice.
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