Effects of Inorganic Nitrogen Availability on the Sporophytes of Acrostichum Aureum L. |
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Authors: | Pillai RS Ong B-L |
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Institution: | (1) Department of Biological Sciences, The National University of Singapore, Lower Kent Ridge Road, Singapore, 119260, Republic of Singapore |
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Abstract: | Plants grown at low irradiance were fertilized with 0, 60, and 600 g m-3 NH4NO3 once every fortnight. Plants treated with high N concentrations showed an increased growth, producing longer and broader
fronds with larger areas, and were darker green in colour. Nitrogen also increased the content of chlorophyll (Chl) and carotenoids
per leaf area unit. Different N treatments did not affect the photosynthetic efficiency of photosystem 2, as reflected by
the high values of Chl fluorescence kinetics Fv/Fm, ranging between 0.81 to 0.84, and Fv/F0 of 4.30 to 5.10. An increase in photochemical quenching (qP), accompanied by a decrease in non-photochemical quenching (qN), was observed in sporophytes fertilized with increased concentrations of NH4NO3. Nitrogen availability allowed sporophytes of Acrostichum aureum to become more established under natural condi tions.
This revised version was published online in September 2006 with corrections to the Cover Date. |
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Keywords: | chlorophyll fluorescence fern fertilization growth photosynthesis |
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