The length of the induction period vs. the minimum number of long-day cycles needed for floral induction in Lemna gibba G3

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The min-[24(0)] (the IP) and the min-[16(8)] (the min-LD in hr) for Lemna gibba G3 were estimated by extrapolation of the log. of the flower number vs. the culture time curves at various temperatures in the presence or absence of various chelating agents. With the control culture grown in the M-sucrose medium, both the min-[24(0)] and the min-[16(8)] decreased with the rise in temperature until a common plateau of 48 hr was reached at 26'C. At any given temperature, any metal chelator in any dosage examined equally reduced the min-[16(8)], but the min-[24(0)] was reduced differently depending on the species and dose of chelator. In all cultures with chelators, however, both the min-[24(0)] and the min-[16(8)] could not have a lower limit of less than 24 hr. Apparently the min-[24(0)] could take any values, but the min-[16(8)] needed multiples of 24 hr, starting from 24 or 48 hr in the presence or absence of chelators, Under [16(8)], but not under [24(0)], the temperature-sensitivity changed rhythmically with a 24-hr period. Presumably the min-[24(0)] is mostly determined by an hourglass-type clock, while the min-[16(8)] is determined by endogenous circadian rhythm.
日本植物生理学会の論文