Mechanism of salt tolerance in Chinese wild rye (Aneurolepidium chinense (Trin.) Kitag.), 1: The possibility of participation of osmotic adjustment
2007
Lianfeng(Obihiro Univ. of Agriculture and Veterinary Medicine, Hokkaido (Japan)) | Yamamoto, S.
Chinese wild rye (Aneurolepidium chinense (Trin.) Kitag.) is widely distributed in Inner Mongolia of China, and is highly tolerant to salt. Therefore, this grass seems to be very useful for the recovery of saline desert. This study was conducted to clarify whether osmotic adjustment in this grass results in the salt tolerance, by comparing with perennial ryegrass (moderately salt tolerant) and meadow fescue (salt sensitive). Osmotic pressure in the roots of the three grasses increased twice in a similar manner by treatment with NaCl. The increase in the osmotic pressure of the three grasses was mainly due to increases in Na and Cl. On the other hand, K concentration decreased approximately by 30 and 60% by the treatment in Chinese wild rye and other two grasses, respectively. Osmotic pressure in the shoot of Chinese wild rye did not change by the treatment, while those of other two grasses increased by 30-50%. The results obtained suggest that osmotic pressure is not associated with the salt tolerance of Chinese wild rye. It was also shown that K decreases to a small extent in Chinese wild rye by the salt.
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