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The interaction of plant hormones and rotation around a horizontal axis on the growth and Flowering ofXanthium pensylvanicum

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Summary

Xanthium pensylvanicum plants were rotated around a horizontal axis at 0.25 rpm. The stem growth, and flowering response were studied in rotatedXanthium treated with gibberellic acid (GA3), indoleacetic acid (IAA). Leaf growth of rotatedXanthium was also studied.

In both light and dark, the length and the number of nodes in stems of rotatedXanthium were significantly less than the stationary controls. Application of 10 μg and 100 μg of GA3 increased the stem length over that of the untreated controls and furthermore, GA3 application decreased the dwarfing effect of rotation such that stems of rotatedXanthium treated with GA3 were not significantly different from stationary GA3 treated plants.

Leaf laminae that were in the late cell division and leaf expansion stage at the beginning of the rotational treatment were not significantly different in size from the controls after 21 days of rotation. However, laminae that were in the cell division and earlier stages of development during rotational treatment were significantly smaller than the controls by the 17th day of rotational treatment. As the successive younger leaves expanded, the rotated laminae were significantly smaller than stationary laminae at the progressively earlier stage.

In rotatedXanthium plants, floral enhancement did not occur when GA3 was applied just prior to rotational treatment. Foliar application of IAA to both rotated and stationary plants did not significantly affect the floral response.

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Authors and Affiliations

  1. Department of Botany and Plant Biochemistry, University of California at Los Angeles, Los Angeles, California, USA

    Takashi Hoshizaki,  Bruce H. Carpenter &  K. C. Hamner

  2. Space Biology Laboratory, Brain Research Institute UCLA Medical Center, Los Angeles 24, California, USA

    Takashi Hoshizaki

  3. Department of Biology, Long Beach State College, Long Beach, California, (USA)

    Bruce H. Carpenter

Authors
  1. Takashi Hoshizaki
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  2. Bruce H. Carpenter
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  3. K. C. Hamner
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With 2 Figures in the Text

Supported in part by a grant toK. C. Hamner from the National Science Foundation and by USAF Grant AFOSR 61-81/French.

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Hoshizaki, T., Carpenter, B.H. & Hamner, K.C. The interaction of plant hormones and rotation around a horizontal axis on the growth and Flowering ofXanthium pensylvanicum . Planta 61, 178–186 (1964). https://doi.org/10.1007/BF01879889

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  • DOI: https://doi.org/10.1007/BF01879889

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