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By Mark A. Ragan

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Extra info for A Biochemical Phylogeny of the Protists

Example text

3 The Endosymbiotic Theory in P h y l o g e n e t i c s All c h l o r o p l a s t s t h a t h a v e b e e n e x a m i n e d p o s s e s s n u m e r o u s s i m i l a r i t i e s t o e a c h o t h e r , m a k i n g it r e a s o n a b l e t h a t c h l o r o p l a s t s , o r p r o t o c h l o r o p l a s t s , a r o s e a t m o s t o n l y a few t i m e s d u r i n g e v o l u t i o n . T h e s e s i m i l a r i t i e s a r e often quite fundamental to chloroplast function, and e n c o m p a s s both biochemical and morphological characters.

S t o r c k a n d c o - w o r k e r s (see b e l o w ) h a v e f o u n d i n t e r e s t i n g p a t t e r n s in t h e D N A G C r a t i o s of a w i d e r a n g e of t r u e fungi. In c o n t r a s t , M a n d e l et ai ( 1 9 6 5 ) f o u n d t h a t t h e d i v i s i o n s w i t h i n t h e g e n u s Chlorobium ( b a s e d o n D N A G C r a t i o s ) d i d n o t c o r r e s p o n d well w i t h t h e t w o s p e c i e s t h e n r e c o g n i z e d in t h e g e n u s . O n a l a r g e r s c a l e , A s h m a r i n et ai ( 1 9 7 0 ) f o u n d c e r t a i n c o r r e l a t i o n s b e t w e e n n u t r i t i o n a l m o d e s of b a c t e r i a a n d t h e i r D N A G C ratio.

T h i s w o u l d p r e s u m a b l y h a v e r e m o v e d t h e e v o l u t i o n a r y p r e s s u r e t o w a r d d e v e l o p m e n t of a d v a n c e d t y p e s of m e t a b o l i s m by i n c r e a s i n g t h e a v a i l a b l e s u p p l y of o r g a n i c c a r b o n . I n s t e a d , e v o l u t i o n of G o l g i a n d m i c r o t u b u l a r s y s t e m s m i g h t h a v e b e e n s t r o n g l y s e l e c t e d for, a s t h e s e c o u l d b e i n v o l v e d in e n d o c y t o s i s .

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