Articles

EFFECTS OF SHADE ON PHOTOSYNTHETIC CHARACTERISTICS IN CHIEH-QUA

Article number
659_103
Pages
799 – 804
Language
English
Abstract
The effects of shade (40% shade and 60% shade) on leaf photosynthetic characteristic in Chieh-qua (Benincasa hispida Cogn.var. Chieh-qua How. cv.
Jiangxin) were studied under plastic greenhouse conditions in Guangzhou, China.
The concentration of chlorophyll a, chlorophyll b, total chlorophyll in leaves increased with increasing shade, but the ratio of chlorophyll a/b decreased.
Net photosynthetic rate, stomatal conductance, transpiration rate, and intracellular CO2 concentration, which were measured under the same light intensity, decreased gradually increasing shade.
With increasing shade, F0, Fv/Fm and Fm/F0 increased, and PSII, and decreased.
The increase of Fv/Fm indicated that photochemical turnover efficiency of photo-system II enhanced with shade.
The decrease of PSII indicated that the efficiency of PSII electron transportation decreased.
The decrease of and d indicated that photochemical quenching and non-photochemical quenching also decreased with increasing shade.

Publication
Authors
H. Liu, Q. Huang, R. Chen
Keywords
Benincasa hispida var. Chieh-qua, chlorophyll, net photosynthetic rate, Chlorophyll fluorescence, light intensity
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