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Salt-tolerant reed plants contain lower Na plus and higher K plus than salt-sensitive reed plants

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Takahashi R., Nishio T., Ichizen N., Takano T.

Acta Physiologiae Plantarum

2007

tom 29

nr 5

Reed plants (Phragmites australis Trinius) grow not only in fresh and brackish water areas but also in arid and high salinity regions. Reed plants obtained from a riverside (Utsunomiya) were damaged by 257 mM NaCl, whereas desert plants (Nanpi) were not. When the plants were grown under salt stress, the shoots of the Utsunomiya plants contained high levels of sodium and low levels of potassium, whereas the upper part of the Nanpi plants contained low levels of sodium and high levels of potassium. One month salt stress did not affect potassium contents in either Utsunomiya or Nanpi plants, but it did dramatically increase sodium contents only in the Utsunomiya plants. The ratio of K⁺ to Na⁺ was maintained at a high level in the upper parts of the Nanpi plants, whereas the ratio markedly decreased in the Utsunomiya plants in the presence of NaCl. Accumulation of Na⁺ in the roots and Na⁺ efflux from the roots were greater in the Nanpi plants than in the Utsunomiya plants. These results suggest that the salt tolerance mechanisms of Nanpi reed plants include an improved ability to take up K⁺ to prevent an influx of Na⁺ and an improved ability to exclude Na⁺ from the roots.

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Concept of hybrid embankment

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Fukue M., Lechowicz Z., Takahashi R., Uehara K.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

2015

tom 47

nr 2

Concept of hybrid embankment. An innovative technique which is similar to a natural process, i.e., biogeochemical (carbonate) diagenesis, is proposed to construct a hybrid embankment. In this study, the hybrid embankment is defined as a soil embankment which has a microbially induced framework structure of sand sheets and columns in the soft soil matrix. The sand materials are cemented with magnesium-calcite or dolomite, induced by ureolytic microbes. To design and construct hybrid embankments, fundamental problems, such as feasibility in terms of stability, geoenvironmental engineering practices, etc., are examined and discussed. It was shown that the hybrid embankment can be environmentally friendly and also can contribute solving technical and financial problems encountered in actual practice.

Ograniczanie wyników

1 Acta Physiologiae Plantarum

1 Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

2 Takahashi R.

1 Fukue M.

1 Ichizen N.

1 Lechowicz Z.

1 Nishio T.

1 Takano T.

1 Uehara K.

1 2015

1 2007

Wyniki wyszukiwania

Salt-tolerant reed plants contain lower Na plus and higher K plus than salt-sensitive reed plants

Concept of hybrid embankment