Effect of far-red light pulse on induction and production of flowers in Lemna paucicostata 6746 in darkness
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A short-day duckweed. Lemna paucicostata 6746, was exposed to continuous darkness at 26℃, and the changes in the floral parameters (3) due to far-red and/or red light pulse given at various times of the dark period were studied. Parameters a (vegetative growth rate) and φ (flowering ratio) were respectively decreased and increased with a far-red light pulse given at the outset of the dark period. The decreased a and the increased φ remained almost unchanged until the 7th hour, but returned to their initial levels thereafter. The far-red light actions on a and φ were reversed by subsequent exposure to red light. Parameter P_1 (pre-flower induction period) was extended by 1 day when far-red and/or red pulse was given at about the 7th hour of the dark period. A far-red pulse given at the outset of the dark period only affected parameter P_2 (flower induction period). Although the sensitivity of P_2 to red light increased with time, its sensitivity to far-red light remained constant and at about the 7th hour was equally sensitive to far-red and red lights. Both red and far-red pulses given later than the 7th hour were increasingly ineffective on P_2. The red/far-red reversibility occurred only for the action on P_2 of the far-red pulse applied during the early dark period. Parameter P_4 (flower production period) varied rhythmically in length with a far-red pulse, the maximum shortening and extension being induced by the pulse given at about the 7th and 19th hours, respectively. The sensitivity of P_4 to red light also changed rhythmically with an inverse phase angle to the rhythmic response to far-red light, and the far-red and red light actions were reversed respectively by subsequent red and far-red lights. These findings suggested that multiple timing devices including an hourglass-type clock and a circadian clock are involved in duckweed flowering.
- 日本植物生理学会の論文
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関連論文
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- Effects of Ferrous and Phosphate Ions on Flowering in Lemna paucicostata 6746 in Diluted Hutner's Medium
- Effect of far-red light pulse on induction and production of flowers in Lemna paucicostata 6746 in darkness
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