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The Effects of Chronic Gamma Irradiation on the Growth of Kalanchoe cv. "Brilliant Star"

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Kalanchoe seedlings were exposed to 330 r/20 hrs/day from a Co60 source. Samples were harvested weekly. No new leaves were produced after initial exposure to irradiation. Mitosis in the apical meristem appears to have been suppressed. However, the axillary meristem and the cambium continue their activity. This results in a much broadened stem tip with enlarged cells, supported by a stout internode in which cell size has remained relatively normal but cell number has increased. After about 26 days of exposure, meristematic activity in the shoot apex region appears to resume. This results in the formation of growth centers which … continued below

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Stein, O. L. & Sparrow, A. H. February 1, 1963.

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Kalanchoe seedlings were exposed to 330 r/20 hrs/day from a Co60 source. Samples were harvested weekly. No new leaves were produced after initial exposure to irradiation. Mitosis in the apical meristem appears to have been suppressed. However, the axillary meristem and the cambium continue their activity. This results in a much broadened stem tip with enlarged cells, supported by a stout internode in which cell size has remained relatively normal but cell number has increased. After about 26 days of exposure, meristematic activity in the shoot apex region appears to resume. This results in the formation of growth centers which can give rise to leaves or malformed structures. The original phyllotaxy is not recovered. It is suggested that this resumption of growth may be an instance of adaptation to irradiation.

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Digitized from microopaque cards (2).

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  • February 1, 1963

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  • Feb. 5, 2022, 9:41 a.m.

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  • Sept. 27, 2022, 5:05 a.m.

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Thumbnail image of item number 1 in: 'The Effects of Chronic Gamma Irradiation on the Growth of Kalanchoe cv. "Brilliant Star"'.
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Stein, O. L. & Sparrow, A. H. The Effects of Chronic Gamma Irradiation on the Growth of Kalanchoe cv. "Brilliant Star", report, February 1, 1963; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc1250508/: accessed March 19, 2025), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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