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Photocontrol of petiole elongation in light-grown strawberry plants

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Summary

The mode of phytochrome control of elongation growth was studied in fully-green strawberry (Fragaria x Ananassa Duch.) plants. Petiole growth showed two distinct types of response to light. In one, the end-of-day response, petioles were lengthened by low-intensity far-red irradiation for 1 h immediately following the 8 h photoperiod. The response was little or no greater with prolonged exposure and less when the start of far-red was delayed. It was already evident in the first leaf to emerge after treatment began. With the development of successive leaves a second, photoperiodic, type of response appeared, in which petioles lengthened following only prolonged exposure to red, far-red, mixtures of the two, or tungsten lighting, all at low levels of intensity. As with the inhibition of flowering in previous experiments, irradiation with red light during the second half of the otherwise long dark period gave the greatest response.

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Abbreviations

FR:

far-red light

HIR:

high irradiance response

R:

red light

Pr :

phytochrome in the red light absorbing form

Pfr :

phytochrome in the far-red light absorbing form

SDP:

short-day plant

LDP:

long-day plant

PAR:

photosynthetically active radiation

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Authors and Affiliations

  1. Department of Botany, Plant Science Laboratories, University of Reading, Whiteknights, Reading, U.K.

    Daphne Vince-Prue

  2. Department of Agriculture and Horticulture, University of Bristol, Research Station, Long Ashton, BS18 9AF, Bristol, U.K.

    C. G. Guttridge

  3. Department of Agriculture and Horticulture, University of Reading, Reading, U.K.

    M. W. Buck

Authors
  1. Daphne Vince-Prue
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  2. C. G. Guttridge
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  3. M. W. Buck
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Vince-Prue, D., Guttridge, C.G. & Buck, M.W. Photocontrol of petiole elongation in light-grown strawberry plants. Planta 131, 109–114 (1976). https://doi.org/10.1007/BF00389978

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  • DOI: https://doi.org/10.1007/BF00389978

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