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You don’t want to sleep. Enjoy your slavery. But spare me please. Let me do my functions. Yes, this is what plant want to say.

nighttree

Plants are aware of day and night. Just like we do, they have circadian rhythms tuned to the cycle of light and darkness. It tells them which time of year it is and which time of day it is. It is important for them to find the time of day and year for flowering purpose and to find out how quickly they can consume starch during night which they produced during the day. That depend of length of the night for them.[1] [2].

 “Artificial light at night can impact directly on plants. In addition to conversion of sunlight into energy via photosynthesis (to which the relatively low light levels experienced by plants under artificial light at night probably make a very minor contribution), plants respond to their natural light environment through photoreceptors, the best understood of which are the phytochrome family. Phytochrome has several

physiological roles and is used by plants to receive information concerning time of year (day length) and shading by other plants and to trigger responses in terms of germination, vegetative

development and phenology and growth form, particularly allocation to reproductive and vegetative growth

. Phytochrome exists in two interchangeable forms, Pr, which preferentially absorbs light in the red portion of the spectrum, and Pfr, which preferentially absorbs in the far-red. The ratio between red and far-redwavelengths of light in particular is thus detected by phytochrome and is used by plants to infer

information about their environment. Hence red lights are used in horticulture to control flowering and shoot elongation. Even low levels of light typical of street lighting, and/or brief periods of exposure during the hours of darkness, are often sufficient to produce a response”[3]

If tree or plant in your vicinity is not flowering properly, reason could be the recently installed halogen or led street light.

nighttree2

Some potential impacts of artificial night-time light on a grassland ecosystem. (a) Top-down trophic effects may occur if aggregation, population growth or greater foraging efficiency of consumers leads to higher resource exploitation, and potential cascading effects to lower trophic levels. (b) Bottom-up trophic effects may occur if light-induced changes in the physiology, abundance or composition of primary producers (plants) alter the provisioning of resources to higher trophic levels. (c) Non-trophic effects may occur if other links between species—such as pollination or competition within a trophic level—are modified by artificial light.

nighttree3

“The mesocosm experiment provides evidence for a potential ‘bottom-up’ mechanism by which artificial night-time light at levels typical around human settlements can both directly affect growth form and reproductive effort in plants, and indirectly affect herbivore density. Flowering in L. pedunculatus plants in artificial grassland communities peaked in early July 2013 and fell in late July and August, partly due to a period of dry weather. Unsurprisingly, the presence of herbivores suppressed the density of flower heads throughout the year, but in both the presence and absence of herbivores flowering was also suppressed by monochromatic amber light at night at a peak wavelength similar to LPS street lighting and to a slightly lesser extent by white LED lighting. Previous studies have shown that L. pedunculatus is a long-day plant, and individuals of northern European origin failed to produce flowers when introduced to lower latitudes in northern New Zealand where summer days are not sufficiently long. However, links between spectra, intensity and physiological triggers can be complex and in this experiment low intensity light appears to inhibit, rather than induce flowering.”

(a,b) Counts of flower heads of the leguminous plant L. pedunculatus in experimental grassland mesocosms in summer 2013, in the presence and absence of herbivores. Black shows controls (unlit at night), blue shows white light treatment and orange lines show amber light treatment (mean ± s.e.). (c) Three-minute timed counts of pea aphids A. pisum in mesocosms in 2013, colours as above. Asterisks represent significant differences between the light treatment and control—for L. pedunculatus inflorescence counts were consistently lower under both light types during the flowering season, across all survey dates and independent of the presence of herbivores. For A. pisum, counts were significantly lower under amber lights only during mid-August. At this time, A. pisum was found almost exclusively on L. pedunclatus flowers, which were rare in the lit treatments.

 

It’s all karma. Don’t be surprised by increasing numbers of IVF centers. We decrease flowering capacity of plants by showing our arrogance over nature, not respecting nature’s cycle, we get what we sow.


Reference


[1] http://ec.europa.eu/environment/integration/research/newsalert/pdf/artificial_light_at_night_impact_on_plants_and_ecology_455na2_en.pdf

[2] https://www.youtube.com/watch?v=H0JPYijaA64

[3] http://rstb.royalsocietypublishing.org/content/370/1667/20140131

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