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| Effects of Nitrogen and Phosphorus Sources on Chlorophyll Fluorescence Characteristics and Growth of Green Alga Cy lindrotheca sp. |
| LIANG Ying,SUN Ming-hui,TIAN Chuan-yuan,CAO Chun-hui |
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Abstract The effects of 3 nitrogen sources (sodium nitrate , ammonium chloride and urea ) and 3 phosphorus sources (sodium dihydrogen phosphate , sodium glycerophosphate and disodium adenosine triphosphate) on chlorophyll fluorescence characteristics and growth in green alga Cylindrotheca sp .B200 were studied by aerated indoor batch culture method and chlorophyll fluorescence analysis .The results showed that the maximal values of Fv/Fm (the maximum photochemical efficiency of PS Ⅱ) were observed in urea treatment from the 1st day to the 4th day and in sodium nitrate treatment from the 7th day to the 9th day ,respectively .For the parameters Pm (the maximum efficiency of photosynthesis ) and qP (the photochemical quenching) ,the maximal values were recorded in sodium nitrate treatment from the 3rd day to the 9th day and the minimal values were recorded in urea treatment during the entire experimental period .The maximal values of α (the initial slope of the rapid light curve) were detected in sodium nitrate treatment from the 1st day to the 7th day ,while those of Ik (the half saturation of light intensity ) were recorded in sodium nitrate treatment from the 4th day to the 9th day .At the end of experiment ,there were higher final cell density and dry weight in sodium nitrate treatment than those in other treatments .The minimal chlorophyll contents were shown in ammonium chloride treatment while the higher values were found in sodium nitrate and urea treatments ,without significant difference in the two treatments .For phosphorus sources , the maximal values of Fv/Fm were observed in sodium dihydrogen phosphate treatment w hile the minimal values in disodium adenosine triphosphate treatment from the 5th day to the 9th day .The parameters qP and α were found significantly higher under sodium dihydrogen phosphate treatment than those in other treatments from the 3rd day to the 9th day .The maximal and minimal Pm and Ik values were recorded in sodium dihydrogen phosphate and disodium adenosine triphosphate treatments from the 6th day to the 9thday ,respectively .At the end of experiment ,the final cell density ,dry weight and chlorophyll content were significantly higher in the sodium dihydrogen phosphate treatment than those in other two treatments .
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Received: 25 May 2014
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