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[nafex] Re: re: aronia

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
>Also, if you are high, the plants are exposed to more ultraviolet
>light.  Some plants like that, but others get "sunburned" and don't

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