盐胁迫对黄花苜蓿发芽及幼苗生长的影响

Germination experiment was conducted to study the effect of salt stress on germination and seedling growth of Medicago falcata, with two cultivars of Medicago sativa (cw400 and Gongnong2) as control. Seeds were germinated at eleven salinities (0，20，40，60，80，100，120，140，160，180，200 m mol/L NaCl) and germination percentage, rate of germination, as well as seedling growth were measured to detect the differences amang three cultivarscline. The results showed that germination percentage and rate of germination decreased with increases in salinity, as well as the length of radicle and hypocotyl. Compared to cw400 and Gongnong2, M. falcata did not show superiority on germination percentage and rate of germination, but the radicle length of M. falcata exhibited good with less effect and insignificant differences between treatments. Recovery experiment revealed that seeds of the three materials can keep viable in salt solutions. The total germination reached the maximum 100% at 60 m mol/L for cw400 and M. falcate, but only that of M. falcate exceeded 90% in all treatments. The recovery germination showed no significant differences between treatments. Therefore, M. falcata is more appropriate than M. sativa to grow on the Songnen grassland.