盐胁迫和干旱胁迫对田野苦荬菜种子萌发的影响

Effects of Salt Stress and Drought Stress on the Seed Germination of Sonchus arvensis L.

该文研究了田野苦荬菜种子萌发对盐胁迫和干旱胁迫的响应。结果表明:(1)田野苦荬菜种子萌发不耐盐胁迫。在浓度为0~0.10mol/L的Na Cl溶液中,田野苦荬菜种子萌发进程受到显著抑制,最终萌发率和萌发速率显著降低,0.10mol/L浓度时仅为1.33%和0.01%/h。(2)田野苦荬菜种子萌发不耐干旱胁迫。田野苦荬菜种子只能在渗透势为0^-0.4MPa环境下萌发,且在渗透势为-0.1MPa时,最终萌发率和萌发速率显著降低到13.33%、0.12%/h。(3)盐胁迫和干旱胁迫对种子活力影响较小。Na Cl溶液浓度为0.05~0.10mol/L下各处理的复水萌发率均在70%以上;而渗透胁迫各处理下复水萌发率也均达到80%以上。因此,在栽培时应保证土壤中含有较低的盐分以及充足的水分条件。

This study was to evaluate the the effect of salt stress and drought stress on the seed germination of Sonchus arvensis L..The results showed that：（1）S.arvensis has litter tolerance for salt stress on seeds germination. S.arvensis seeds germination process was significantly inhibited,and the germination percentage and germination ratewas significantly reduced when the Na Cl solution concentration was from 0mol/L to 0.10mol/L. The germination per-centage and germination rate was only 1.33% and 0.01%/h at the Na Cl solution concentration of 0.10mol/L.（2）S.arvensis seeds germination was significantly inhibited by drought stress. S.arvensis only germinated when the solutionosmotic potential was higher more than-0.4MPa.The germination percentage and germination rate was significantlydecreased to 13.33% and 0.12%/h when the osmotic potential of-0.1MPa.（3）The un-germinate seed vigor of saltand drought stress was slightly affected.The re-germination percentage could reach more than 70% after treated byNa Cl solution at a concentration of 0.05~0.10mol/L,and also could reach more than 80% after osmotic stress treat-ments. Therefore,the cultivation of S.arvensis should ensure conditions that the soil contains less salt and plenty ofwater.