An Introduction to Biological Rhythms by John D. Palmer PDF

By John D. Palmer

ISBN-10: 0125444508

ISBN-13: 9780125444507

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2 5 , 1 4 5 - 1 4 8 (1960). a r r a n g e m e n t , t h e p l a n t cell c a n b e e a s i l y e n u c l e a t e d b y c u t t i n g off t h e b a s a l tuft o f r h i z o i d s . B i o l o g i s t s — c y t o l o g i s t s i n p a r t i c u l a r — h a v e s y s t e m a t i c a l l y e x p l o i t e d t h i s p l a n t i n e x p e r i m e n t s d e s i g n e d to e l u c i d a t e t h e r o l e o f t h e n u c l e u s i n t h e life o f t h e cell. W h e n t h i s p l a n t i s p l a c e d i n a l t e r n a t i n g c y c l e s o f l i g h t a n d d a r k n e s s , it i s f o u n d to d i s play a r h y t h m in p h o t o s y n t h e s i s , o n e w h i c h will persist even in e n u c l e a t e d cells for as l o n g as 4 0 d a y s i n c o n t i n u o u s d i m i l l u m i n a t i o n (Figure 2 - 5 ) .

Konopka, and S. Benzer, Proc. Natl. Acad. Sei. A. 6 8 , 2 1 1 2 - 2 1 1 6 (1971). lengths in constant darkness: o n e h a d a p e r i o d of 19 hours a n d the o t h e r 2 8 h o u r s ( t h e w i l d - t y p e p e r i o d is 2 4 h o u r s i n c o n s t a n t d a r k n e s s ) ( F i g u r e 1-18). All t h e m u t a n t traits a p p e a r e d to i n v o l v e t h e s a m e f u n c tional gene on the X c h r o m o s o m e . D e p e n d i n g on one's interpretation of t h e c a u s e o f t h e a p p e a r a n c e o f c i r c a d i a n p e r i o d s i n c o n s t a n t c o n d i tions, the mutation can b e thought of as changing the basic frequency o f t h e c l o c k p e r i o d , or a c h a n g e i n t h e f o r m o f t h e t e m p e r a t u r e - s e n s i tivity p h a s e - r e s p o n s e rhythm.

3 h o u r s , r e s p e c t i v e l y . T h e q u e s t i o n is t h u s p o s e d as to w h e t h e r there are two clocks, in an individual plant, each of w h i c h 34 2. A Survey of Rhythms in Plants and Animals r u n s at a different r a t e , o r w h e t h e r o n e o f t h e m u l t i p l e c o u p l i n g s b e t w e e n a s i n g l e c l o c k a n d t h e m a n y r h y t h m s it d r i v e s h a s b e e n alt e r e d b y t h e artificiality o f t h e l a b o r a t o r y s e t t i n g . The Effectiveness of Chemical Manipulations A s m e n t i o n e d i n C h a p t e r 1, r h y t h m i c o r g a n i s m s h a v e b e e n s u b j e c t e d to literally h u n d r e d s o f c h e m i c a l s u b s t a n c e s i n a t t e m p t s to alter their clockworks.

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An Introduction to Biological Rhythms by John D. Palmer


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