Effects of combined saline and alkaline stresses on seed germination of jizi in Hunan province
[Objective]To study the effects of saline and alkaline compound stresses on seed germination and seedling of Jizi in Hunan.[Method]The experiment simulated the characteristics of salt composition in the natural state of saline and alkaline land. Two neutral salts (NaCl,Na2SO4) and two alkaline salts (NaHCO3,Na2CO3) were mixed in the ratios of 1∶1∶0∶0,1∶2∶1∶0,1∶9∶9∶1,1∶1∶1∶1,and 9∶1∶1∶9,which were labeled as A,B,C,D,and E treatments,respectively,with deionized water as control (CK).This research investigated the effects of mixed saline and alkaline stresses on their germination indexes and seedling growth of Hunan Jizi .[Result]The germination rate of Hunan jizi seeds decreased significantly (P＜0.05) with the increase of salt concentration. On the 5th day,the ger-mination rates of Hunan jizi seeds were 8.5％,16.4％,and 23.6％ lower than that of the control (97.3％) when the salt concentration was 150 mmol/L,and salt concentrations increased up to 250 mmol/L.The significant decrease (P＜0.01) of Hunan jizi seeds' germination rate indicates that the mixed stresses of salinity and alkalinity had a strong inhibitory effect on the germination of Hunan Jizi. The changes of germination potential,germination index,vigor in-dex,root length and seedling length of Hunan Jizi were all in line with the germination rate. The germination of Hu-nan Jixi seeds under neutral and alkaline compound stresses was greatly inhibited,while all germination indices of Hu-nan Jixi under neutral salt compound of 250 mmol/L were 0. With the increase of salinity,the contents of Na+,pro-line,and MDA in the leaves increased gradually,while the content of K+decreased significantly.[Conclusion]The increase in salt concentration inhibited the germination of Hunan Jizi. The results of this study provide a theoretical basis for the cultivation of Hunan Jizi in saline soil.
Echinochloa frumentaceasalt alkali compound stressgermination rategermination index
万方数据
维普
