THE SEMIDIAN RHYTHM IN FLOWERING RESPONSE OF PHARBITIS-NIL IN RELATION TO DARK PERIOD TIME MEASUREMENT AND TO A CIRCADIAN-RHYTHM
THE SEMIDIAN RHYTHM IN FLOWERING RESPONSE OF PHARBITIS-NIL IN RELATION TO DARK PERIOD TIME MEASUREMENT AND TO A CIRCADIAN-RHYTHM
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DOI：
10.1111/j.1399-3054.1988.tb00599.x
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发表时间：
1988-06-01
影响因子：
6.4
通讯作者：
EVANS, LT
中科院分区：
文献类型：
--
作者：
HEIDE, OM;KING, RW;EVANS, LT
在27度的温度下，将白腹草（Pharbitis nil Choisy, cv Violet）幼苗暴露在单一的诱导暗期。C，在2-3 h的黑暗中，短暂的红光中断(R)可以促进开花，但在8-9 h的黑暗中，对开花的抑制作用越来越大。当远红光（FR）在黑暗前2小时（FR -2小时）或FR -15小时中断之前的光照周期时，这种对R中断的节律性反应可以提前bb10 1小时，而FR -8小时或FR -22小时则会延迟节律。R中断节律的这些变化与开花所需的暗期长度的相等变化是平行的。短暂的FR中断黑暗显示出类似的节奏，也被FR -2小时提前，并被FR -8小时延迟。因此，我们得出结论，我们之前描述的光中的半周期节奏至少持续到黑暗的前12小时，表现在R中断节奏中，并决定了临界夜长。我们还发现了一个对开花有显著影响的昼夜节律，但一些证据表明，昼夜节律和半昼夜节律对开花有独立的加性影响，而不表现出相位相互作用。
When seedlings of Pharbitis nil Choisy, cv Violet, are exposed to a single inductive dark period at 27.degree. C, brief interruptions with red light (R) can be promotive after 2-3 h of darkness but increasingly inhibitory to flowering up to the 8-9th h of darkness. This rhythmic response to R interruptions can be advanced in phase by > 1 h when the preceding light period is interrupted with far-red (FR) 2 h before darkness (FR -2 h) or with FR -15 h, whereas FR -8 h or FR -22 h retard the rhythm. These shifts in the R interruption rhythm are paralleled by equal shifts in the length of the dark period required for flowering. Brief FR interruptions of darkness displayed a similar rhythm which was also advanced by FR -2 h and retarded by FR -8 h. We conclude therefore that the semidian rhythm in the light, which we have previously described, continues through at least the first 12 h of darkness, is manifested in the R interruption rhythm, and determines the critical night length. A circadian rhythm with a marked effect on flowering was also identified, but several lines of evidence suggest that the circadian and semidian rhythms have independent additive effects on flowering and do not appear to show phase interaction.