کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2180218 1095119 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photosynthetic acclimation and photoinhibition on exposure to high light in shade-developed leaves of Fagus crenata seedlings
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
Photosynthetic acclimation and photoinhibition on exposure to high light in shade-developed leaves of Fagus crenata seedlings
چکیده انگلیسی

The physiological response of leaves developed in low light (L) on Fagus crenata seedlings exposed to different levels of high light (H: high light, M: medium light) was studied. Measurements were conducted on potted seedlings in the F. crenata   forest understory. The seedlings with leaves developed in L were transferred to H (L–H) and M (L–M) in summer. On exposure to high light, the photochemical efficiency of dark-adapted PSII (Fv/FmFv/Fm) immediately decreased and was followed by a subsequent recovery in both L–H and L–M leaves. The mean value of Fv/FmFv/Fm in L–H leaves was lower than that in L–M leaves through experiments, indicating that the degree of photoinhibition in L–H leaves was greater than that in L–M leaves. About 1 month after transfer, 37% and 5% of leaves had fallen in L–H and L–M seedlings, respectively. This result also indicated the greater photoinhibition in L–H leaves. Moreover, the photosynthetic capacity (PNmaxPNmax) of L–H leaves decreased. In contrast, the PNmaxPNmax of L–M leaves increased, although the PNmaxPNmax was lower than that of M control leaves. An increase in the xanthophyll cycle pool (VAZ), indicating an increase of the photoprotective function, was found in both L–H and L–M leaves. Especially, the VAZ pool in L–M leaves was higher than that in M leaves by the end of experiments. L–M leaves may avoid photoinhibition effectively by the decrease in excess light with the increase of the PNmaxPNmax or VAZ pool, compared to L–H leaves. Thus, the physiological acclimation on exposure to high light depended on the degree of high light. To achieve successful photosynthetic acclimation with slight photoinhibition, the variation of light intensity before and after exposure to high light would be an important factor because of the difference in excess light.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Flora - Morphology, Distribution, Functional Ecology of Plants - Volume 201, Issue 2, 15 February 2006, Pages 120–126
نویسندگان
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