Abstract:The phloem exudate prepared from the cotyledons of Ipomoea tricolor strain Heavenly Blue seedlings that have been exposed to a single 16 h dark period induced flowering in cultured apices excised from non-induced seedlings. When the phloem exudate was dialyzed and separated to 3 fractions such as low ( 1,000), middle (1,000 10,000), and high ( 10,000) molecular weight, both low and high molecular weight fractions had flower-inducing activities, but not middle fraction. The low molecular weight fraction was fur… Show more
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