The Effect of Drought Stress and Excessive Uv-B Radiation on the Membrane Status in Cucumber Cotyledons and Leaves

Rybus-Zając, Magdalena; Korbas, Agata; Kubiś, Jan

doi:10.30825/5.ejpau.34.2017.20.4

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“…Antioxidant defense was activated at the stage of cotyledons and leaves when plants were exposed to the stress of water deficit and excessive UV-B radiation [Kubiś and Rybus-Zając 2008, Rybus-Zając and Kubiś 2010]. Our findings also suggest that the water deficit and UV-B radiation applied together generally alleviated the effect of individual stresses within the cellular membrane [Rybus-Zając et al 2017]. In this study we analyzed changes in the nitrogen metabolism of cucumber cotyledons and leaves exposed to water deficit and UV-B radiation applied individually and in combination.…”

Section: Resultsmentioning

confidence: 52%

Nitrogen Metabolism in Cucumber Cotyleons and Leaves Exposed to the Drought Stress and Excessive Uv-B Radiation

Rybus-Zając

Kubiś

2018

Acta Sci.Pol.Hortorum Cultus

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Plants absorb light energy for photosynthesis, and some amount of potentially damaging range of solar radiation, ultraviolet B. It accounts for less than 0.5% of the total solar radiation and the ambient current level of UV-B during the growth season provide 10 kJ•m-2 energy per day on the Earth's surface. In the field conditions, increased UV-B radiation is often accompanied by drought, but negative effect of combined stresses is not so deleterious as the effect of one of them alone. We studied some changes in nitrogen me deficit and UV-B radiation. The stresses generally decreased the biomass and total dry matter production. Combination of water deficit and UV-B activated a stress tolerance mechanism in cucumber seedlings. The NR activity and synthesis of UV-B absorbing compounds were induced. Protection against UV-B radiation can partially involve increased production of UV-B protective pigmentsslightly increased the SPAD value in cucumber cotyledons and leaves was observed. The deleterious effect of combined stresses was weaker than their additive or individual effects.

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Section: Resultsmentioning

confidence: 52%