Re: Photoperiods & the dark cycle

From: Mark T. Bachelor (bachelor@gateway.mggs.vic.edu.au)
Date: Mon Aug 03 1998 - 23:20:26 PDT

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Date: Tue, 4 Aug 1998 16:20:26 +1000
From: "Mark T. Bachelor" <bachelor@gateway.mggs.vic.edu.au>
To: cp@opus.hpl.hp.com
Message-Id: <aabcdefg2589$foo@default>
Subject: Re: Photoperiods & the dark cycle

Greetings Chris,

there actually is a dark phase of photosynthesis and it is not respiration
(which is of cause the opposite reaction). The initial reactions in
photosynthesis require light while the second stage continues as long as
there are still reactants available, regardless of whether it is light or
dark. Once the products produced in the light reaction are exhausted the
dark reaction stops.
Therefore the rest of what you said still applies just the same. There is
no requirement for darkness unless you are inducing flowering in plants that
require a lack of light for this to happen.

Does anyone actually know which cp species require given periods of light,
or given periods of darkness to flower, or are they responding temperature
changes or prehaps the availability of water?

Regards

Mark T Bachelor
Biology Technican
Melbourne Girls Grammar School Voice: +61 (03) 9866 1676
South Yarra, Victoria, Fax: +61 (O3) 9866 5768
Australia 3141

National Science Week, STAV Family Day Co-ordinator

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