North American Fruit Explorers mailing list at ibiblio

["Kristina & Bruce" <herenorthere@lycos.com>]

If I remember correctly from plant physiology class years ago, plants start 
closing their pores mid-afternoon, long before they lose usable sunlight.  I 
think that is under standard field conditions, not just when unusually water 
stressed.  Maybe things are different for plants growing in cloud forests or 
other unusually humid environments, but plants everywhere else battle the 
drying power of sun and air, no matter how moist the root zone.  They do 
awfully well - I've always been amazed so many plants tolerate the sun and 
arid air of deserts, as long as there's moisture in the soil.  Bruce Wittchen


>   Date: Fri, 03 Aug 2001 20:36:08 -0400
>   From: Ginda Fisher <ginda@concentric.net>
>Subject: Re: re: aronia
>
>I'm sure most plants are sensitive to humidity.  Many plants close their
>pores in response to water stress, which reduces the air flow and the
>amount of photosynthesis they can do.  Many plants will keep on chugging
>so long as the roots can provide enough water, but I wouldn't be
>surprised if some plants from damp climes just aren't designed to pull
>water up fast enough to keep the leaves from being water stressed in the
>desert.
>
>Also, if you are high, the plants are exposed to more ultraviolet
>light.  Some plants like that, but others get "sunburned" and don't
>thrive.
>
>Ginda
>



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