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KMID : 0903620040450020066
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Journal of the Korean Society for Horticultural Science
2004 Volume.45 No. 2 p.66 ~ p.73
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Comparison of Sensitivity to Photoinhibition and UV-B Stress between Developing and Mature Leaves of Red Pepper (Capsicum annuum L.) Plants from Control and Gamma-Irradiated Seeds
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Kim, Jin-Hong
Baek, Myung-Hwa/Chung, Byung Yeoup/Lee, Young Bok/Kim, Jae-Sung
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Abstract
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The stress-resistance of red pepper (Capsicum annuum L. ev. Yeomyung and Joheung) plants from the seeds irradiated with low doses of gamma-radiation (2, 4, 8, and 16 Gy) was examined under the conditions of photoinhibition and UV-B stress. To induce photoinhibition, the leaves acclimated overnight with a dim light were exposed to a photon flux density (PFD) of 200 μmol·m^(-2)·s^(-1) at 25℃ for 1 h. Then, they were further exposed to the same PFD with supplementary UV-B irradiance at 25℃ for 3 h (UV-B stress). The gamma-irradiation stimulated the early growth of the plants in both cultivars at 2, 4, and 8, Gy. However, this phenomenon was not paralleled with the changes in the maximal photochemical efficiency of photosystem Ⅱ, Fv/Fm, after photoinhibition and UV-B stress. In contrast, the values of Fv/Fm decreased more in the mature leaves after photoinhibition than in the developing noes. The latter had generally higher contents of β-carotenes and total carotenoids than did the former. Based on the results obtainsed, we suggest that the elevation in the stress-resistance of the plants by gamma-irradiation could be dependent on the plant species/cultivars (or the stress conditions), and that the degree of the leaf maturation could affect the sensitivity of the leaves to photoinhibition, but might not to UV-B stress.
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