Effect of 9,10-.ALPHA.-Ketol Linolenic Acid Treatment on Flower Bearing in Satsuma Mandarin

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  • ウンシュウミカンの着花に及ぼす９，１０－α－ケトールリノレン酸の影響
  • Effect of 9,10-α-Ketol Linolenic Acid Treatment on Flower Bearing in Satsuma Mandarin

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α-Ketol linolenic acid (KODA, or 9-hydroxy-10-oxo-12(Z),15(Z)-octadecadienoic acid) was previously isolated from Lemna paucicostata. In a previous study, it was reported that KODA promoted flowering in several kinds of plants. In the present study, the effect of KODA on flowering in one-year-old satsuma mandarin (Citrus unshiu Marc.) trees on trifoliate orange rootstocks was examined. During exposure to low autumn temperatures, which are floral inductive, satsuma mandarin trees were treated with KODA at different stages. After defoliation and transferring plants to a high temperature (25°C) room, the number of flowers was counted. With an increase in exposure to low autumn temperatures, the number of flowers after defoliation at 25°C increased both in non-treated and KODA-treated trees. On October 30, the number of flowers after defoliation at 25°C was higher in trees that had been sprayed with KODA before October 10 compared to that in non-treated trees. The increase in the number of flowers following KODA treatment was accompanied by an increase in the number of sprouting nodes. Under continuous warm-temperature (25°C), which was not floral inductive, KODA treatment had no effect on the number of flowers after defoliation at 25°C. These findings suggested that KODA treatment under floral inductive conditions could promote flower-bearing in satsuma mandarin. In addition, it was suggested that the principal cause of the increase in flower bearing by KODA treatment was the promotion of axillary bud sprouting. However, KODA treatment tended to exhibit a limited effect on flower bearing when the number of chilling hours have been insufficient.<br>

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