ISSN:
1573-9058
Keywords:
diurnal variation
;
photoinhibition
;
photosystem 2 reaction centres
;
state transition
;
trans-thylakoid membrane proton gradient
;
Triticum aestivum
;
xanthophyll cycle
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Non-photochemical quenching of chlorophyll fluorescence (qN) and its three components (qNf, qNm, and qNs) in the flag leaves of wheat grown in the field were studied by a fluorometer PAM-2000 on clear days. The diurnal variation patterns of qN in just fully extended (JFEL) and aging leaves (AL) were similar, but qNm declined markedly in JFEL while it remained at a relatively high level in AL under strong sunlight at noon. Furthermore, at midday qNf was higher than qNs in JFEL, but much lower in AL. The results show the relative contributions of different mechanisms in preventing the photosynthetic apparatus from photodamage change during leaf development.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1007012709125
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