NDLI: Photoinhibition in Chilling Stressed Wheat and Maize

Content Provider	Springer Nature Link
Author	Lidon, F.C. Loureiro, A.S. Vieira, D.E. Bilhó, E.A. bre, P. Costa, R.
Copyright Year	2001
Abstract	At chilling stress, the contents of photosynthetic pigments decreased significantly in maize, but in wheat the contents of chlorophyll (Chl) remained unchanged whereas the contents of total carotenoids (Car) increased. In both species the contents of α+β carotene and lutein + lutein-5,6-epoxide remained unaffected, but the de-epoxidation state involving the components of the xanthophyll cycle increased. Under chilling stress the photosynthetic electron transport also displayed a general failure in maize but in wheat only photosystem (PS) 2 coupled to the water oxidation complex was inhibited. Moreover, in stressed maize the quinone pool decreased, while the low and high potential forms of cytochrome b $_{559}$ increased. In wheat only the contents of cytochrome b $_{559LP}$ decreased. Peroxidation of acyl lipids in the chloroplast lamellae became more distinct in chilling stressed maize but could also be detected in wheat. Thus in chilling stressed maize prevails an impairment of the acceptor site of PS2 while in wheat photodamage is restricted to the electron donation pathway from water to P680 or to the oxygen evolving complex.
Starting Page	161
Ending Page	166
Page Count	6
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	39
Issue Number	2
e-ISSN	15739058
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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