Experimental evaluation of temperature dependence of flower bud development in satsuma mandarin
2006
Ogata, T.(National Inst. of Fruit Tree Science, Kuchinotsu, Nagasaki (Japan). Dept. of Citrus Research) | Takahara, T. | Muramatsu, N. | Fujisawa, H.
To improve the flowering date estimation of citrus trees using DTS (the number of days transformed to standard temperature) method, effects of temperature on the development of satsuma mandarin (Citrus unshiu Marc. cv 'Okitsu wase' and 'Otsu No.4') flower buds were investigated using potted trees under controlled temperatures from February to flowering. Some flushes at 10 deg C and 13 deg C treatments showed physiological disorder whereas flushes at 15/10 deg C treatment grew without trouble in spite of the average temperature being lower than 13 deg C, indicating that temperatures of 15 deg C or above are necessary in daytime for satsuma mandarin shoots to grow properly. The developmental rate of citrus flower buds was significantly increased as the temperature rose. The dependence of the developmental rate upon temperature could be described by a single Arrhenius equation range of 10-25 deg C until flowering. The Ea value in the Arrhenius equation, which represents the dependence of the developmental rate upon temperature, was 86.8 kJ.mol(-1) (20.8kcal.mol(-1)). This Ea value would be appropriate for estimating the flowering date of satsuma mandarin based on a developmental model derived from Arrhenius' law, regardless of location or cultivar.
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