1) The document discusses factors that affect the phosphorus absorbing efficiency of different duckweed genotypes, including light intensity, temperature, pH, and phosphorus concentration.
2) An experiment was conducted comparing three duckweed genotypes: Lemna aequinoctialis, Spirodela oligorrhiza, and Spirodela polyrrhiza. S. oligorrhiza had the highest phosphorus uptake rate despite a slower growth rate.
3) The results indicate that Spirodela genotypes are better suited than Lemna for removing phosphorus from wastewater, especially in conditions with higher phosphorus concentrations, making them a good candidate for wastewater treatment.
1. Cai Shumei 蔡 树 美 Phosphorus Absorbing Efficiency Discrepancy of Duckweed under Different Influence Factors Dept. of Bioscience & Biotechnology Yangzhou University
5. Phosphate Absorption Mechanism of plants’ Phosphorus Absorption Membrane Transport protein Ion channel Carrier Diffusion Active transport Ion channel Ion channel Ion channel Carrier Ion channel Carrier Ion channel Carrier Carrier Ion channel Carrier Membrane Transport protein Carrier Membrane Transport protein Ion channel Carrier Membrane Transport protein M O I H + -ATPase H + ATP+H 2 O ADP+Pi OH - + ADP H 2 O Phosphate Carrier OH - H 2 PO 4 - HPO 4 2- PO 4 3 - H 2 PO 4 - Ion channel Carrier Membrane Transport protein
11. Tab.1 Phosphorus absorbency comparison of different duckweed genotypes The English capital letter and lowercase expressed the mean difference is significant at the .01 and .05 level in the treats. Genotypes Biomass increase （ g ） Total Pi uptake （ mg ） Pi uptake rate (mgPi/gFW) L. aequinoctialis 3.197±0.327aA 3.382±0.010aA 1.066±0.112aA S. oligorrhiza 1.684±0.037bB 3.312±0.003bB 1.967±0.045bB S. polyrrhiza 1.663±0.063bB 3.336±0.005cC 2.008±0.077bB
12. Fig.1 The relationship between pi uptake rate and its concentration in solution （ a: L. aequinoctialis ， b: S. oligorrhiza ， c: S. polyrrhiza ） a b c
13. Tab.2 Kinetic parameters of Pi uptake by different genotypes of duckweed **: the siginificant were at 1% level. Genotypes Kinetic Equation R 2 K m (μmol/L) V max (μmol/gFW•hr) L. aequinoctialis S. oligorrhiza S. polyrrhiza I=5C/ (1.25+C) I=7.698C/ (2.186+C) I=9.606C/ (2.695+C) 0.971 ** 0.966** 0.987** 1.250 2.186 2.695 5.000 7.698 9.606
14. Fig. 2 Ultrastructure of chloroplasts in mesophyllic cells of different duckweed genotypes a b c （ a: L. aequinoctialis×18500 ， b: S. oligorrhiza ×26500 ， c: S. polyrrhiza ×26500 ）
15. Fig. 3 ACP activities of different duckweed genotypes
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