초록 close

This study was conducted to examine the effect of root-zone temperature (RZT) on growth and development of cyclamen (Cyclamen persicum cv. Metis Scarlet Red) under low air temperature regime for energy saving. Cyclamen plants with 67 unfolded leaves were exposed to RZT 12, 16, 20, or 24oC in a constant 12oC room equipped with floating hydroponic and nutrient-stagnant wick culture systems. Root-zone heating promoted growth, showing the maximum dry weight at 20oC. The number of leaves and visible buds (VB) at harvest increased as RZT increased from 12 to 20oC, but slightly decreased from 20 to 24oC. Root-zone heating promoted photosynthesis and hastened leaf unfolding and VB emergence. RZT of 20oC increased root activity as compared with that of 12oC, although there was no difference in leaf width and root length. Most favorable RZT for growth and development of cyclamen under low air temperature was 20oC. Therefore, root-zone heating improved growth and development in ‘Metis Scarlet Red’ cyclamen under low air temperature for saving heating energy.