Effects of nitrogen deficiency on the gas exchange, chlorophyll fluorescence and chloroplast ultrastructure in fingered citron
The pot experiments were applied to study the effect of nitrogen (N) deficiency on the gas exchange, chlorophyll fluorescence, photosynthetic pigment contents, chloroplast ultrastructure and the activities of antioxidative enzymes in fingered citron (Citrus medica var. sarcodactylis Swingle). The re...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2009-05-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2009.03.012 |
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| Summary: | The pot experiments were applied to study the effect of nitrogen (N) deficiency on the gas exchange, chlorophyll fluorescence, photosynthetic pigment contents, chloroplast ultrastructure and the activities of antioxidative enzymes in fingered citron (Citrus medica var. sarcodactylis Swingle). The results show that N deficiency caused a significant reduction in chlorophyll (Chl), chlorophyll a (Chla) content and the ratio of Chla/chlorophyll b (Chlb), and increased the ratio of carotenoids (Car) / Chl. Under the treatment of N deficiency, the gas exchange rate, the maximum efficiency of PSII photochemistry (Fv/Fm), the effective PS II quantum yield (Φ PS Ⅱ), the photochemical quenching (qP) and the electron transport rate (ETR) were significantly declined. Meanwhile, the minimum fluorescence yield (Fo) and the nonphotochemical quenching (qN) increased with N deficiency. We also found the declines in the activities of superoxide dismutase isoenzyme (SOD), peroxidase (POD) and catalase (CAT), the increase of malondialdehyde (MDA) contents in the stressed leaves and the disordered chloroplast lamellae structure. It was indicated that N deficiency reduced primarily the photochemical pigment contents, decreased the electron transport efficiency, then induced the lipid peroxidation, which resulted in the injuries of chloroplast lamellae structure and the photosynthetic centers, and finally, induced the decline in the net photosynthetic rate. |
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| ISSN: | 1008-9209 2097-5155 |