Abstract

Strain Kidachi of Pharbitis nil scarcely flowered in response to poor nutrition (culture in tap water) under continuous light, although strain Violet flowered easily. In parallel to the flowering response, the chlorogenic acid (CGA) content in the cotyledons did not increase during the culture in tap water in Kidachi, although it rapidly increased in Violet. The F1 hybrids between these two strains and their F2 progeny flowered in response to poor nutrition, although F1 showed a lower and F2 a much lower flowering response than the parent Violet. These flowering responses were closely correlated with the accumulation of CGA in the cotyledons.

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