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This article in CS

  1. Vol. 16 No. 5, p. 715-718
     
    Received: Jan 17, 1976


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doi:10.2135/cropsci1976.0011183X001600050030x

Effects of UV-B Radiation on Net Photosynthesis of Some Crop Plants1

  1. T. K. Van,
  2. L. A. Garrard and
  3. S. H. West2

Abstract

Abstract

Thirteen crop plants were subjected to an enhanced ultraviolet “B” (UV-B) radiation (280 to 320 nm) regime that simulated a 0.19 atm cm ozone level, solar angle 55° (approximately 50% ozone depletion at 30° N latitude), to determine their susceptibility to photosynthetic impairment. As evidenced by net CO2 uptake and dry weight measurements, these plants exhibited a wide range of response to enhauced levels of UV-B radiation. These species were classified either as “sensitive” (pea, Pisum sativum L.; collard, Brassica oleracea L., var. acephala; cabbage, Brassica oleracea L., var. capitata; soybean, Glycine max L.; and oat, Avena sativa L.), “moderately sensitive” (tomato, Lycopersicum esculentum L.; sorghum Sorghum bicolor L.; rye, Secale cereale L.; and rice, Oryza sativa L.), or “tolerant” (corn, Zea mays L.; digitgrass, Digitaria decumbens Stent.; pearl millet, Pennisetum americanum (L.) K. Schum.; and peanut, Arachis hypogaea L.) in respect to their sensitivity to UV-B radiation. Plants grown in growth chambers with the same UV-B enrichment but a lower irradiance of visible light (50 W.m-2) showed greater photosynthetic impairment than did greenhouse-grown plants. This was postulated to be due to photorepair under greenhouse conditions.

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