Effect of Salinity on Growth, Photosynthesis and Mineral Composition in Leguminous Plant Alhagi pseudoalhagi (Bieb.)
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概要
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Leguminous plant Alhagi pseudoalhagi wqas subjected to 0 (control), 50, 100, and 200 mM NaCl treatments during a 30 d period to examine the mechanism of tolerance to salinity. Plant dry weight, net CO_2 assimilation rate, leaf stomatal conductance, intercellular CO_2 concentration, and solute concentration in leaves, stems, and roots were determined. Total plant weight in the 50 mM treatment was 170% of that of the control after 10 d of treatment. Total plant weight was lower in the 100 and 200 mM treatments than in the control. The leaf CO_2 assimilation rate was approximately 150% of that of the control in the 50 mM treatment, but was not affected significantly by 100 mM of NaCl, while it was reduced to about 60% of that the control in the 200 mM treatment. Similarly stomatal conductance was consistent with the CO_2 assimilation rate regardless of the treatments. Intercellular CO_2 concentration was lower in the NaCl-treated plants than in the control. Changes in CO_2 assimilation rate due to salinity stress could be mainly associated with stomatal conductance and the carboxylation activity. Although the leaf Na^+ concentration increased to 900 mmol kg^<-1> dry weight in the 200 mM treatment compared to 20 mmol kg^<-1> in the control, the plants did not die and continued to grow at such a high leaf Na^+ concentration. Uptake and transportation rates of Na^+, Ca^<2+>, Mg^<2+>, and K^+, and the accumulation of N were promoted by 50 mM NaCl. Na^+ uptake rate continued to increase in response to external NaCl concentration. However, the uptake and transportation rates of Ca^<2+>, Mg^<2+>, and K^+ behaved differently under 100 and 200 mM salt stress. The results suggest that A. pseudoalhagi is markedly tolerant to salinity due mainly to its photosynthetic activity rather than to other physiological characteristics.
- 社団法人日本土壌肥料学会の論文
著者
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SANEOKA Hirofumi
Faculty of Applied Biological Science, Hiroshima University
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Saneoka Hirofumi
Department Of Environmental Dynamics And Management Graduate School Of Biosphere Science Hiroshima U
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Saneoka Hirofumi
Department Of Environmental Dynamics And Management Graduate School Of Biosphere Sciences Hiroshima
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Saneoka Hirofumi
Faculty Of Applied Biological Science Hiroshima University
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Saneoka Hirofumi
Graduate School Of Biosphere Sci. Hiroshima Univ. 1-4-4 Kagamiyama Higashi-hiroshima 739-8528 Jpn
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Premachandra G
Faculty Of Applied Biological Science Hiroshima University:(present Address)department Of Agronomy P
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FUJITA Kounosuke
Faculty of Applied Biological Science, Hiroshima University
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Kurban Halil
Graduate School for International Development and Cooperation
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Nehira Kunito
Graduate School for International Development and Cooperation
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Adilla Rahmutulla
Xinjiang Institute of Biology, Pealology and Desert Research,Academia Sinica
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Fujita K
Department Of Environmental Dynamics And Management Graduate School Of Biosphere Science Hiroshima U
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Fujita K
Graduate School Of Biosphere Science Hiroshima University
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Fujita K
Department Of Environmental Dynamics And Management Graduate School Of Biosphere Sciences Hiroshima
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Fujita Kounosuke
Faculty Of Applied Biological Science Hiroshima University
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Premachandra Gnanasiri
Department of Agronomy, Purdue University
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Premachandra Gnanasiri
Faculty Of Applied Biological Science Hiroshima University
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Kurban Halil
Graduate School For International Development And Cooperation Hiroshima University:(present Address)
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Nehira K
Hiroshima Univ. Higashi-hiroshima Jpn
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Adilla Rahmutulla
Xinjiang Institute Of Ecology & Biology
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