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Reasons for inefficacy of DIF on French marigold (Tagetes patula, 'Bonanza yellow'): Analysis of hypocotyls elongation in the light and dark periods

Shimizu , H. ; Tsushima , Y. ; Komatsu , K.

Journal of Science and High Technology in Agriculture, 2008, Vol.(1), pp.26-30

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  • Título:
    Reasons for inefficacy of DIF on French marigold (Tagetes patula, 'Bonanza yellow'): Analysis of hypocotyls elongation in the light and dark periods
  • Autor: Shimizu , H. ; Tsushima , Y. ; Komatsu , K.
  • Assuntos: Tagetes ; Hypocotyls ; Image Analysis ; Image Processing ; Air Temperature ; Tagetes ; Hypocotyle ; Analyse D'Image ; Traitement D'Images ; Temperature De L'Air ; Tagetes ; Hipocotilos ; Analisis De Imagenes ; Tratamiento De Imagenes ; Temperatura Del Aire
  • É parte de: Journal of Science and High Technology in Agriculture, 2008, Vol.(1), pp.26-30
  • Notas: Summaries (En, Ja) ; 1 tab. 3 fig. 8 ref.
  • Descrição: Hypocotyl elongation of French marigold (Tagetes patula, 'Bonanza Yellow') under three DIF (difference between day and night temperature) conditions (day temperature (DT): 25 deg C/night temperature (NT): 15 deg C, 20/20, 15/25) was analyzed using image processing. Experiments were conducted in growth chambers with a photosynthetic photon flux (PPF) of 150 micro mol/s/square m on the canopy level and a 12 h photoperiod provided by fluorescent lamps. Images of ten plants were acquired every 10 minutes for 7 days and stored for later evaluation. The stored images were analyzed using software developed in-house and applied sub-pixel estimation to an area-based pattern-matching algorithm. Hypocotyl elongation over 7 days under three DIF conditions (25/15, 20/20, 15/25) ranged from 5.7 to 6.1 mm. There were no significant differences among the conditions, clearly indicating that DIF was not effective for enhancing marigold culture. ANOVA test on hypocotyl elongation during the light period of the second and third day demonstrated a significant difference. However, in the dark period, ANOVA test did not show a significant difference under DIF treatments. Then multiple comparison tests were performed on hypocotyl elongation during the light period, and that under the -10 DIF condition was significantly lower than that during the light period under other DIF conditions. However, since elongation during the dark period of -10 DIF was relatively higher, the daily elongation under the -10 DIF condition was similar to that under the other DIF conditions. It was clearly shown that the cause of not reacting to DIF was almost constant elongation through a single day under 0 and +10 DIF conditions, while under the -10 DIF condition, elongation was decreased during the light period but increased during the dark. Therefore, the daily elongation was almost the same under all DIF conditions. ; Summaries (En, Ja) ; 1 tab. 3 fig. 8 ref.
  • Idioma: Japonês

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