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Light intensity and temperature regulate petiole elongation by controlling the content of and sensitivity to gibberellin in Cyclamen persicum

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  • Cultivation Physiology
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Abstract

This study was carried out to investigate the responses of cyclamen to gibberellic acids (GAs) and GA biosynthesis inhibitors under different temperature and light intensity during different period, and then to examine the changes in GA level and sensitivity to GA under these environmental conditions. ‘Metis Scarlet Red’ cyclamen plants with 15 fully unfolded leaves were grown under in three controlled environment chambers maintained at 16/12 (LT), 22/18 (MT), 28/24°C (HT) (day/night), respectively. In each chamber, there were growth modules which provided three photosynthetic photon fluxes (PPFs) [60 (LL), 120 (ML), 240 (HL) μmol∙m−2∙s−1] at canopy height with 16 hours (08:00–24:00) of photoperiod by fluorescent lamps. Exogenous GA3 and GA4+7 increased petiole length at all PPF and temperature treatments and the promoting effect was larger under higher PPF irrespective of temperature. But, daminozide and paclobutrazol inhibited petiole elongation rate and inhibition activity increased with decreasing PPF. GA3 nullified the inhibiting effect on petiole elongation by daminozide. However, there were significant differences in the elongation rate promoted and inhibited by GA3 and daminozide, respectively, between PPFs and temperatures. Promoting effects of GA3 on petiole elongation increased with decreasing PPF and increasing temperature.

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Authors and Affiliations

  1. Department of Horticultural Science and LED-IT Fusion Technology Research Center, Yeungnam University, Gyeongsan, 712-749, Korea

    Wook Oh

  2. Department of Plant Science, Seoul National University, Seoul, 150-721, Korea

    Ki Sun Kim

  3. Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul, 150-721, Korea

    Ki Sun Kim

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  1. Wook Oh
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  2. Ki Sun Kim
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Correspondence to Ki Sun Kim.

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Oh, W., Kim, K.S. Light intensity and temperature regulate petiole elongation by controlling the content of and sensitivity to gibberellin in Cyclamen persicum . Hortic. Environ. Biotechnol. 55, 175–182 (2014). https://doi.org/10.1007/s13580-014-0135-1

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  • DOI: https://doi.org/10.1007/s13580-014-0135-1

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