Title: The physiological mechanisms underlying how eremophyte Reaumuria soongorica responses to severe NaCl stress
Abstract:In this study,we investigated the effects of 150 mmol·L-1 NaCl on the growth,salt secretion,and the Na+ distribution pattern of Reaumuria soongorica.The results showed that 150 mmol·L-1 NaCl has a pos...In this study,we investigated the effects of 150 mmol·L-1 NaCl on the growth,salt secretion,and the Na+ distribution pattern of Reaumuria soongorica.The results showed that 150 mmol·L-1 NaCl has a positive effect on the growth of R.soongorica,the fresh weight and dry weight indicated significant enhancement by 14% and 18%,respectively.However,any significant changes of the tissue water content were not observed in R.soongorica treated with 150 mmol·L-1 NaCl for 7 days.When exposed to high concentration NaCl condition,the net Na+ uptake rate in root significantly increased for 44 times as that of control;correspondingly,the Na+ secretion and accumulation in shoots of R.soongorica exhibited significant enhancement which was 25 times and 2.1 time than that of control,respectively.Further analysis showed that the percentage of Na+ secretion increased from 4.3% in the control to 35%,and the percentage of Na+ accumulation in shoots also was 43%.These findings suggest that,under saline environment,R.soongorica is able to absorb large quantity Na+,most of which where Na+ were secreted through salt gland or accumulated in shoots,thus to alleviate the toxic effects of Na+ and maintain water status in plant,which contribute to stimulate the growth of plant.Read More
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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Cited By Count: 4
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