Corn Response to Separate and Joint Effects of Radiation and Salt Stress
2019
E. S. Jafarov | M. Z. Velijanova | J. R. Orujova
In the present work, by determining the content of malondialdehyde, proline and total protein, an attempt was made to find out the role of presowing irradiation of seeds in the development of corn in salt conditions. In so doing, a rather wide range was used, both of the radiation dose and the salt concentration. The effects of radiation and salt have been studied separately as well as in their combination. It was shown that pre-seed γ-irradiation of seeds in doses from 5 to 100 Gy in normal conditions contributes to a slight increase in the level of MDA. However, in the case of salt stress, NaCl in concentrations from 1 to 50 mM for unirradiated seeds, on the contrary, causes a strong increase in the content of MDA. And with the joint action of salt and radiation (radiation doses of 1–50 Gy, salt concentration 1–10 mM), the content of lipid oxidation product remains almost constant. It has been established that proline, as an antioxidant, plays an insignificant role in protecting the plant from salt stress. However, in pre-sowing at low doses, the role of proline in protecting the plant from salt stress is essential. It is shown that both higher radiation doses and higher concentrations of NaCl separately lead to a decrease in total protein content. And in the case of double stress for seeds irradiated in small doses, salt at concentrations up to 1 mM does not cause changes in the total protein content. Moreover, for seeds irradiated in large doses, a sharp decrease in the protein content is observed. It is assumed that pre-sowing irradiation of seeds in certain doses, to some extent, facilitates salt stress at low concentrations of NaCl.
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