An Introduction to Biological Rhythms by John D. Palmer

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By John D. Palmer

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T h e p h a s e o f d a i l y r h y t h m s c a n b e s e t b y l i g h t - d a r k a n d t e m p e r a t u r e c y c l e s to a n y t i m e o f t h e d a y . W h e n t h e o r g a n i s m s are t h e n placed in constant conditions, this n e w phase persists. 4 . T h e p e r i o d l e n g t h o f d a i l y r h y t h m s c a n b e l e n g t h e n e d or s h o r t ened b y subjecting organisms to light-dark alterations w h o s e comb i n e d lengths are longer or shorter than 24 hours. T h e c h a n g e thus p r o d u c e d i s o n l y i l l u s o r y , h o w e v e r , s i n c e a s s o o n as t h e s e o r g a n i s m s a r e p l a c e d i n c o n s t a n t c o n d i t i o n s , t h e p e r i o d r e v e r t s b a c k to a b o u t 2 4 hours.

U n d e r these conditions the periods of the sleepm o v e m e n t r h y t h m s c o n t r o l l e d b y t h e p r i m a r y p u l v i n i ( i n t h e leaf axil) a n d t h e s e c o n d a r y p u l v i n i (at t h e j u n c t i o n o f t h e b l a d e a n d p e t i o l e ) differ, e . g . , at a l i g h t i n t e n s i t y o f a b o u t 6 f o o t c a n d l e s , t h e t w o p e r i o d s a r e 2 8 a n d 3 0 . 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.

Center for Agricultural Publishing and Documentation, Wageningen, Netherlands. Harker, J. E. (1964). " Cambridge Univ. Press, London and New York. Menaker, M. (1969). Biological clocks. Bioscience 1 9 , 6 8 1 - 6 8 9 . , (1971). " Nat. Acad. Sei. C. Mills, J. , ed. (1973). " Plenum, New York. Palmer, J. D. (1970). Biological clocks. In "Encyclopedia of the Biological Sciences" (P. , pp. 1 0 7 - 1 0 8 , Van Nostrand-Reinhold, Princeton, New Jersey. Palmer, J. D. (1974). " Wiley (Interscience), New York.

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