Varietal differences in the adaptability to warming based on fluctuations in the flowering of Satsuma mandarin [Citrus unshiu]
2010
Ono, T., Meiji Univ., Kawasaki, Kanagawa (Japan) | Iwasaki, N.
The effect of global warming on the flowering of satsuma mandarin grown in Japan was investigated in eight cultivars. In a green house that simulated a warming condition, flowers tended to bloom early and flowering periods were prolonged in all cultivars. Increase in leafless flower in the green house caused an increase in the total number of flowers compared to those in the open-field, especially in early- or very early-maturing cultivars. The ratio of the starch concentration to total carbohydrates of the roots positively correlated with the number of leafless flowers, and negatively correlated with the number of leafy flowers. Abscisic acid (ABA) concentration in the leaf during winter correlated positively in all cultivars with the number of leafless flowers or the percentage of leafless flowers to total number of bud burst and was further emphasized by increased ABA from Oct. till Dec. or Jan. These findings suggested that global warming may increase leafless flowers, but decrease leafy flowers in satsuma mandarin grown in the main production areas in Japan, especially in early- or very early-maturing cultivars.
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