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Seedlings normally emerge in the early morning, why ?

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Posted by allan0410e 11 (My Page) on
Wed, Aug 13, 08 at 0:55

Seeds must germinate some time between planting and emergence, the question is are the plants programed to take advantage of as much sunlight on their first day in the world or it some thing else ?
Another question that comes to mind is how do plants "know" which way is up before the light can show them the way ?
That survival of the plant relies on getting things "right" is obvious.
If it is easier than explaining it all (because if you can answer these how and why questions I will be back for more !) please point out a web site or a subject area at the library.
I grew up on a farm and went to an Agricultural high school, but it is only now that these questions come to mind !

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RE: Seedlings normally emerge in the early morning, why ?

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The factors affecting germination are multiple and may be tied to the genetics of the particular plant species or hybrid in question. Environmental conditions do limit germination and the success of such. There are a host of how to grow plants from seed books, pamphlets, etc. Definitely check these out.
For knowing that the surface of the soil is up and that the root is pointed in the right direction check the link below.

Here is a link that might be useful: Geotropism or Gravitopism

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RE: Seedlings normally emerge in the early morning, why ?

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  • Posted by tapla z5b-6a MI (My Page) on
    Mon, Sep 1, 08 at 13:47

Circadian clocks are endogenous auto-regulatory mechanisms that influence a wide range of plant activities within 24 hour environmental cycles. (do a search on Circadian and endogenous rhythm) In most plants, the water (imbibement) potential of seeds increases with the dark portion of the cycle. Seed imbibement is associated with cellular elongation and seed radical emergence, as well as the onset of cellular division (growth) in many plants.

Al

  
 

 

 


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