ワケギのりん茎形成に及ぼす温度前歴の影響

概要

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Bulbing response of Allium × wakegi Araki cv. Kiharabansei No.1 to temperature prior to bulb formation was investigated. The plants exposed to 5℃ for 35 days were grown at 20℃ under photoperiods ranging from 11 to 14 hrs. The control plants were kept above 15℃ before the photoperiodic treatment. Regardless of the exposure to low temperature, the plants did not form bulbs under 11- and 12-hr photoperiods, whereas they did under a 14-hr photoperiod. Under 13- and 14-hr photoperiods, the plants exposed to low temperature had higher bulbing ratios (the maximum diameter of basal leaf sheath/the minimum neck diameter) and higher percentages of tillers with bulb scales (bladeless swollen leaves) than had the control plants. Low temperature exposure did not induce bulb formation of A. × wakegi, but shortened the critical photoperiod for bulb formation from 14 hrs to 13 hrs. When bulbs were stored between 1 and 25℃ for 50 days and grown at 20℃ under a 13-hr photoperiod, storage at or below 15℃ promoted the formation of new bulbs. Storage at 10℃ was more effective than that at 15℃ , but below 10℃, it exerted no additional effect. When bulbs were stored at 5℃ between 0 and 84 days and grown at 20℃ under a 13-hr photoperiod, the formation of new bulbs was promoted as the cold storage period was extended. The promotive effect of low temperature on bulb formation was weakened by subsequent exposure to 25-35℃.
園芸学会の論文
2003-01-15