Modification of the cellular heat sensitivity of cucumber by growth under supplemental ultraviolet-B radiation

Journal Article · Tue Feb 01 04:00:00 EST 1994 · Plant Physiology (Bethesda)

OSTI ID:426052

Caldwell, C R ^[1]

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1. Department of Agriculture, Beltsville, MD (United States)

The effect of ultraviolet B (UV-B) radiation on the thermal sensitivity of cucumber (Cucumis sativus L.) was studied using UV-B-sensitive cv Poinsett 76 and UV-B-resistant cv Ashley grown under control and elevated (300 mW m{sup -2}) UV-B radiation levels. Using both cotyledon and leaf discs, the ability of the tissue to reduce triphenyl tetrazolium chloride (TTC) was determined after treatment at 50{degrees}C for various times. Semilogarithmic plots of TTC reduction as a function of time at 50{degrees}were curvilinear. They were monophasic for the control cucumber and biphasic for cucumber grown in the presence of elevated UV-B. Treatment of cucumber plants at 37{degrees}C for 24 h or of tissue discs at acute UV-B levels for 1 h further modified their response to elevated temperature. These results suggest that growth of cucumber under enhanced UV-B radiation levels increased its ability to withstand elevated temperatures. 19 refs., 2 figs., 2 tabs.

• OSTI ID: 426052
• Journal Information: Plant Physiology (Bethesda), Journal Name: Plant Physiology (Bethesda) Journal Issue: 2 Vol. 104; ISSN 0032-0889; ISSN PLPHAY
• Country of Publication: United States
• Language: English

Related Subjects

56 BIOLOGY AND MEDICINE
APPLIED STUDIES
BIOLOGICAL EFFECTS
CUCUMBERS
GROWTH
HEAT
RESPONSE MODIFYING FACTORS
SENSITIVITY
ULTRAVIOLET RADIATION