Photocontrol of petiole elongation in light-grown strawberry plants Article Received: 26 January 1976 Accepted: 31 March 1976 DOI:
10.1007/BF00389978 Cite this article as: Vince-Prue, D., Guttridge, C.G. & Buck, M.W. Planta (1976) 131: 109. doi:10.1007/BF00389978 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. Abbreviations and Symbols FR
high irradiance response
phytochrome in the red light absorbing form
phytochrome in the far-red light absorbing form
photosynthetically active radiation
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