| Physiological responses of rapeseed(Brassica napus) to drought and phosphorus deficiency Ⅱ: Chlorophyll content and chlorophyll fluorescence parameters |
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| DOI：10.7606/j.issn.1000-7601.2013.02.31 |
| Key Words: rapeseed (Brassica napus) drought stress phosphorus deficiency chlorophyll content chlorophyll fluorescence parameter |
| Author Name | Affiliation | | YU LiPing | Oil Crops Research Institute, Chinese Academy of Agricultural Sciences / Key Laboratory of Oil Crop Biology of the Ministry of Agriculture / Key Laboratory of Crop Physiological Ecology and Cultivation of the Ministry of Agriculture, Wuhan, Hubei 430062, China | | ZHANG ChunLei | Oil Crops Research Institute, Chinese Academy of Agricultural Sciences / Key Laboratory of Oil Crop Biology of the Ministry of Agriculture / Key Laboratory of Crop Physiological Ecology and Cultivation of the Ministry of Agriculture, Wuhan, Hubei 430062, China | | MA Ni | Oil Crops Research Institute, Chinese Academy of Agricultural Sciences / Key Laboratory of Oil Crop Biology of the Ministry of Agriculture / Key Laboratory of Crop Physiological Ecology and Cultivation of the Ministry of Agriculture, Wuhan, Hubei 430062, China | | LI Jun | Oil Crops Research Institute, Chinese Academy of Agricultural Sciences / Key Laboratory of Oil Crop Biology of the Ministry of Agriculture / Key Laboratory of Crop Physiological Ecology and Cultivation of the Ministry of Agriculture, Wuhan, Hubei 430062, China | | LI Guangming | Oil Crops Research Institute, Chinese Academy of Agricultural Sciences / Key Laboratory of Oil Crop Biology of the Ministry of Agriculture / Key Laboratory of Crop Physiological Ecology and Cultivation of the Ministry of Agriculture, Wuhan, Hubei 430062, China |
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| Abstract: |
| The chlorophyll content and chlorophyll fluorescence parameters were measured to explore the effects of drought and phosphorus deficiency on characteristics of chlorophyll parameters in leaves of rapeseed during different growing stages. The results showed that, under drought and phosphorus deficiency during the stem elongation and flowering stage, the content of chlorophyll, maximum fluorescence(Fm), PSⅡmaximum quantum yield(Fv/Fm), PSⅡ actual quantum yield(ΦPSⅡ), photochemical quenching coefficient(qP) and apparent photosynthetic electron transport rate(ETR) were obviously
decreased, while the initial fluorescence(Fo) and non-photochemical quenching coefficient (NPQ) were obviously increased. But these parameters did not obviously change during the seedling stage. Therefore, under drought and phosphorus deficiency during the stem elongation and flowering stage, the PSⅡ reaction center in leaves of rapeseed was damaged and the process of photosynthetic electron transport was restrained. Furthermore, the change extent of these parameters that was caused by phosphorus deficiency was greater than that was caused by drought stress during the stem elongation stage, but it was opposite during the flowering stage. The period during which the maximal effect of photoinhibition was caused by phosphorus deficiency was the stem elongation stage, but that by drought stress was the flowering stage. |
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