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- W76513138 abstract "The i s o e n e r g e t i c a c t i o n s p e c t r a o f a p p a r e n t p h o t o s y n t h e s i s (ApS) fiir intact c.dr.i:ent-year f ~ l i a ~ e of' fi.vre tree species :.I,-,wYY G I L de te rmined from 4 0 0 710 nm by C 0 2 exchange a n a l y s i s . The b l u e (400 500 nm) peak of APS a c t i v i t y f o r t h e g r e e n b road l e a f o f a l d e r was reduced t o a p l a t e a u f o r t h e g r e e n n e e d l e l e a v e s o f D o u g l a s f i r and S i t k a s p r u c e , a s h o u l d e r f o r t h e b l u e g r e e n n e e d l e s o f Colorado s p r u c e , and a reduced s h o u l d e r f o r t h e b lue -whi t e n e e d l e s of Blue s p r u c e . These d i f f e r e n c e s were due n e i t h e r t o a d i f f e r e n t i a l s e l e c t i v e b l u e l i g h t s t i m u l a t i o n o f p h o t o r e s p i r a t i o n n o r t o t h e d i f f e r e n t i a l p r e s e n c e o f a nonp l a s t i d s c r e e n i n g p igment . The c o n i f e r s had v e r y s imi lar c a r o t e n o i d / c h l o r o p h y 1 1 r a t i o s w i t h 40 5 0 % more c a r o t e n o i d r e l a t i v e t o t h e c h l o r o p h y l l as compared t o a l d e r . Blue l i g h t a b s o r p t i o n and low e f f i c i e n c y of e n e r g y t r a n s f e r by t h e c a r o t e n o i d s p r o b a b l y a c c o u n t s f o r t h e low APS a c t i v i t y o f t h e c o n i f e r group compared t o a l d e r . R e f l e c t a n c e s p e c t r o m e t r y , s c a n n i n g e l e c t r o n microscopy, and C 0 2 exchange d a t a showed t h a t t h e b l u e c o l o u r and low APS a c t i v i t i e s o f Colorado and Blue s p r u c e r e s u l t s f rom t h e enhanced s e l e c t i v e r e f l e c t i o n o f b l u e l i g h t which i s a secondary c a r r y over1 ' e f f e c t o f t h e UV s c a t t e r i n g p r o p e r t i e s o f t h e n e e d l e bloom. From t h e s e r e s u l t s i t i s conc l u d e d t h a t t h e b a s i c p h o t o s y n t h e t i c a p p a r a t u s o f t h e s e b r o a d l e a f and c o n i f e r p l a n t s a r e t h e same." @default.
- W76513138 created "2016-06-24" @default.
- W76513138 creator A5038065626 @default.
- W76513138 date "1973-01-01" @default.
- W76513138 modified "2023-09-26" @default.
- W76513138 title "A comparative study of the photosynthetic action spectra for a deciduous and four coniferous tree species." @default.
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- W76513138 hasPublicationYear "1973" @default.
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