Details

Autor(en) / Beteiligte

• Liu, Chang
• Yu, Tao
• Gao, Zhanwu
• Yu, Dafu
• Lin, Jixiang

Titel

Physiologically adaptive strategies of oat seedlings to the three main salts in the soils of the Songnen Plains grasslands

Ist Teil von

• Sheng tai xue bao, 2016, Vol.36 (21)

Erscheinungsjahr

2016

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• To identify the coping mechanisms and the adaptive strategies of oat seedlings exposed to NaC l,NaH CO_3,and Na_2CO_3,the main salts in the soils of the salt-alkali grasslands of the Songnen Plains of China,growth rates and physiological indices of oat seedlings were measured in plants grown in soils with different concentrations( 48-144 mmol /L) of the three salts. The result demonstrated that although oat seedling survival rates were unaffected by NaC l stress,the tiller number,plant height,and shoot and root dry weights decreased with increasing salt concentration,in the order of Na_2CO_3 NaH CO_3 NaC l. In addition,higher concentrations of Na+accumulated in the shoots and roots of oat seedlings under Na_2CO_3 stress and NaH CO_3 stress than in seedlings under NaC l stress. Reductions in concentrations of K+were alsogreater under both Na_2CO_3 stress and NaH CO_3 stress than under NaC l stress,especially in the roots. Large amounts of Cland proline were found to accumulate in oat seedlings,most likely as a strategy for maintaining osmotic and ionic homeostasis under NaC l stress,whereas substantially higher accumulations of proline and organic acid were observed to balance cation deficiency under Na_2CO_3 and NaH CO_3 stresses. These results indicated that the stress effects on oat seedlings of Na_2CO_3 and NaH CO_3 exposure were greater than that of NaC l exposure,with Na_2CO_3 stress having the strongest detrimental effect. In addition,oat seedlings responded to different levels of salt stress through the adoption of various physiological mechanisms.