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Journal of Plant Biology

, Volume 47, Issue 4, pp 314–321 | Cite as

Alterations in the photosynthetic pigments and antioxidant machineries of red pepper (Capsicum annuum L.) seedlings from gamma-irradiated seeds

  • Jin-Hong Kim
  • Myung-Hwa Baek
  • Byung Yeoup Chung
  • Seung Gon Wi
  • Jae-Sung Kim
Article

Abstract

To characterize the stimulatory effects of low-dose gamma radiation on early plant growth, we investigated alterations in the photosynthesis and antioxidant capacity of red pepper (Capsicum annuum L.) seedlings produced from gamma-irradiated seeds. For two cultivars (Yeomyung and Joheung), three irradiation groups (2, 4, and 8 Gy, but not 16 Gy) showed enhanced development, although Fv/Fm, the maximum photochemical efficiency of Photosystem II (PSII), did not differ significantly among any of the four groups. In contrast, values for 1/Fo — 1/Fm, i.e., a measure of functional PSII content, decreased in the irradiated groups of ‘Yeomyung’ but increased in those of ‘Joheung’. Pigment analyses and enzyme activity assays revealed that irradiation altered the compositions of photosynthetic pigments (chlorophylls and carotenoids) as well as the activities of antioxidant enzymes (superoxide dismutase and glutathione reductase). However, these shifts were not directly related to the increase in early growth, although they were cultivar-and developmental stage-dependent In addition, the effects of irradiation on the enzymatic activities measured here were at opposition between the two cultivars.

Keywords

antioxidant enzyme carotenoid chlorphyll a fluorescence low-dose radiation photosynthesis 

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Copyright information

© The Botanical Society of Korea 2004

Authors and Affiliations

  • Jin-Hong Kim
    • 1
  • Myung-Hwa Baek
    • 1
  • Byung Yeoup Chung
    • 1
  • Seung Gon Wi
    • 1
  • Jae-Sung Kim
    • 1
  1. 1.Division of Radiation Application ResearchKorea Atomic Energy Research InstituteDaejeonKorea

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