塩類が<I>Lolium multiflorum, L. perenne</I> および<I>Festuca arundinacea</I> の成長およびイオン含有率におよぼす影響

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  • Effect of Salinity on Growth and Ion Concentration in <I>Lolium multiflorum, L. perenne</I> and <I>Festuca arundinacea</I>
  • Effect of salinity on growth and ion co

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The effect of four levels of salinity (0, 50, 100 and 150 mM NaCl) on growth, Na + accumulation and nitrogen assimilation in three grasses “Lolium multiflorum, Lolium perenne and Festuca arundinacea” was studied. We report a differential response of Lolium and Festuca species to NaCl salinity where Festuca was found to be more resistant than Lolium species. NaCl induced more reduction in dry weight and photosynthetic rate in Lolium species than F. arundinacea. The Na + and Cl- level in plants increased with the increase in salinity. Shoots of Lolium species accumulated high level of Na+ and Cl-. However, high concentration of Na+was not observed in shoots of F. arundinacea. Also, the decrease in K+/Na+ ratios were more severe in Lolium species than F. arundinacea. The total-N and NO3- -N concentration decreased drastically in Lolium species due to salinity. However, such an effect was observed only at 150 mM NaCl in F. arundinacea. The NH4+ -N concentration was increased in all species under salinity. The results indicate that Na+ exclusion probably rescued the Festuca plant from severe stress while in the Lolium species such a resistance mechanism was not established. Our results suggested that there exists potential to utilize Festuca in pasture land management in saline areas.

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