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Effects of saline-sodic stress on organic acid in sweet sorghum.

DAI Ling-yan1, TANG Cheng-rui1, YIN Kui-de1, RUAN Yan-ye2, ZHANG Li-jun2**   

  1. (1College of Life Science and Technology, Heilongjiang Bayi Agricultural University, Daqing 163319, Heilongjiang, China; 2College of Biological Science and Technology, Shenyang Agricultural University, Shenyang 110866, China)
  • Online:2015-03-10 Published:2015-03-10

Abstract:

In order to understand the effects of salinesodic (based on the composition of Na2CO3 and NaHCO3) stress on the organic acid contents in sweet sorghum plant (Sorghum dochna (Forssk.)), the changes of organic acid contents and phosphoenolpyruvate carboxylase (PEPC) activities in above and underground parts of sorghum varieties 314B and M-81E were studied. The results showed that eight different acids (i.e., oxalic acid, tartaric acid, formic acid, pyruvic acid, malic acid, lactic acid, acetic acid, and citric acid) were detected from both of the above and underground parts, while succinic acid was only found in the roots under salinesodic stress. Meanwhile, the levels of most organic acids decreased with the increment of stress level, whereas few of them increased slightly. The PEPC activity increased at low salinesodic concentration, but decreased at high salinesodic concentration. There was no correlation between organic acid level and PEPC activity. Nevertheless, when the PEPC activity increased, the decreasing rate of organic acids changed slightly and vice versa. In terms of the levels of organic acid and PEPC activity, M-81E (stronger tolerance) suffered a weaker damage than 314B (lower tolerance) under salinesodic stress.
 

Key words: protected cultivation to promote early maturing, volatile compounds, grape, blue light, ultraviolet light, red-blue light