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- 저자 : CALVO-POLANCO, MÓ (검색결과 1 건)
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LEE, SEONG HEE,CALVO-POLANCO, MÓ,NICA,CHUNG, GAP CHAE,ZWIAZEK, JANUSZ J. Blackwell Publishing Ltd 2010 Plant, cell and environment Vol.33 No.5
<P>ABSTRACT</P><P>Effects of ectomycorrhizal (ECM) fungus <I>Suillus tomentosus</I> on water transport properties were studied in jack pine (<I>Pinus banksiana</I>) seedlings. The hydraulic conductivity of root cortical cells (<I>L</I><SUB>pc</SUB>) and of the whole root system (<I>L</I><SUB>pr</SUB>) in ECM plants was higher by twofold to fourfold compared with the non-ECM seedlings. HgCl<SUB>2</SUB> had a greater inhibitory effect on <I>L</I><SUB>pc</SUB> in ECM compared with non-ECM seedlings, suggesting that the mercury-sensitive, aquaporin (AQP)-mediated water transport was largely responsible for the differences in <I>L</I><SUB>pc</SUB> between the two groups of plants. <I>L</I><SUB>pc</SUB> was rapidly and drastically reduced by the 50 m<SMALL>M</SMALL> NaCl treatment. However, in ECM plants, the initial decline in <I>L</I><SUB>pc</SUB> was followed by a quick recovery to the pre-treatment level, while the reduction of <I>L</I><SUB>pc</SUB> in non-ECM seedlings progressed over time. Treatments with fluoride reduced <I>L</I><SUB>pc</SUB> by about twofold in non-ECM seedlings and caused smaller reductions of <I>L</I><SUB>pc</SUB> in ECM plants. When either 2 m<SMALL>M</SMALL> KF or 2 m<SMALL>M</SMALL> NaF were added to the 50 m<SMALL>M</SMALL> NaCl treatment solution, the inhibitory effect of NaCl on <I>L</I><SUB>pc</SUB> was rapidly reversed in both groups of plants. The results suggest that AQP-mediated water transport may be linked to the enhancement of salt stress resistance reported for ECM plants.</P>
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