Na+ and K+ concentrations in different plant parts and physiological features of Metroxylon warburgii Becc. under salt stress
2007
Ehara, H.(Mie Univ., Tsu (Japan)) | Shibata, H. | Naito, H. | Mishima, T. | Ala, P.
Nasup(+) and Ksup(+) concentrations in different plant parts and some physiological features under NaCl solution treatment were investigated to study the absorption and distribution of Nasup(+) and Ksup(+) in Metroxylon warburgii (Heim) Becc. that belongs to same genus with sago palm (M. sagu Rottb.) in the palm family. Seedlings at the 11th or 13th leaf stage were used for the treatment of 342mM (2%) NaCl in a green house under natural sun light in mid summer in central Japan. M. warburgii maintained a low Nasup(+) concentration in the leaflets of upper active leaves by storing Nasup(+) mainly in the petioles at lower leaf positions under the NaCl treatment for 36 days. The Nasup(+) concentrations in the roots were lower in the steles than in cortices, and this result suggests the existence of a mechanism to restrict the over influx of Nasup(+) from the cortex into the stele of the roots. The Ksup(+) distribution to the leaflets was not affected by the change in the Nasup(+) concentration in the roots and petioles in M. warburgii. Photosynthetic rate decreased with the NaCl treatment, which was attributed to decrease in stomatal conductance and chlorophyll content per unit leaf area.
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