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Drought and excess UV-B irradiation differentially alter the antioxidant system in cucumber leaves

100%

Kubis J., Rybus-Zajac M.

Acta Biologica Cracoviensia. Series Botanica

2008

tom 50

nr 2

35-41

The combined effects of enhanced UV-B radiation and soil drought on antioxidant enzyme activity were investigated in cucumber leaves. One-month-old cucumber plants (Cucumis sativus cv. Dar) were exposed to UV-B irradiation and water deficit alone or combined. Physiological measurements were made in seedlings kept under stress conditions for nine days and then two more days with stresses withdrawn. Generally a decrease in relative water content and an increase in dry weight content were recorded. The more significant changes were observed under drought than under UV-B radiation and or combined UV-B and drought. Both stresses stimulated antioxidant enzyme activity. Superoxide dismutase activity increased earlier (day 2) than guaiacol peroxidase and glutathione reductase activity (days 5 and 7). Elevation of enzyme activities was higher under drought than under UV-B. Combined UV-B and drought functioned synergistically: one of the stresses reduced the effects caused by simultaneous application of the other.

Ograniczanie wyników

1 Acta Biologica Cracoviensia. Series Botanica

1 Kubis J.

1 Rybus-Zajac M.

1 2008

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Drought and excess UV-B irradiation differentially alter the antioxidant system in cucumber leaves