| 生物土壤与生态 |
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| Study on Characters of Ions Secretion from Reaumuria trigyna |
XUE Yan, WANG Ying-chun
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| College of Life Science, Inner Mongolia University, Hohhot 010021, China |
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Abstract Reaumuria trigyna Maxim, a rare remnant derived from the Mediterranean Sea, is peculiarly endemic to Alax-Erdos Desert of China. The structure of salt gland and secretion characteristics of salt excretion from Reaumuria trigyna, and their relationship with salt distribution in the soil of field environment were studied. The halophyte Reaumuria trigyna, with salt-gland-ferous multi-cells, can secrete salt. The ion composition in Reaumuria trigyna plant and its secretion is consistent to that in habitat soil, all have ions of Na+, K+, Ca2+, Mg2+, SO2-4 and Cl , but different in ion content. Cations as Na+ or Na+ and Ca2+, and anions as Cl or SO2-4 are dominant in soil solutions; K+ is dominant in the roots, stems and leaves of plant, the contents of the six ions follow the order: roots<stems<leaves. In the secretion of Reaumuria trigyna the content of Na+ and Cl- is the highest, followed by SO2-4. The excreting rate of salt gland was higher in the morning than that in the afternoon and higher in daytime than that at night. Such high selectivity of salt gland secreting salt is the self-adjustment mechanism of Reaumuria trigyna to adapt to the wild habitat, maintaining the proper salt and nutrient contents.
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Received: 08 May 2007
Published: 20 May 2008
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2008, Vol. 28 
