NaCl盐胁迫对黍子幼苗生长的影响

Effects of the Growth of Millet Seedlings under Salt Stress

选取浓度为0.4%、0.8%、1.2%、1.6%、2.0%的氯化钠溶液分别对晋黍8号、陇糜8号、内糜5号、宁糜14号和宁糜16号黍子幼苗进行盐胁迫处理,比较5个品种的耐盐性。结果表明:不同黍子品种幼苗对盐胁迫的耐受性不同,地上部分和根系生物量都受到NaCl胁迫的影响,NaCl胁迫对宁糜16号的株高,根长及含水量的影响均不大,当盐浓度为1.6%时苗干重达到最大;晋黍8号和陇糜8号苗干重的最高值分别出现在0.8%和0.4%,其他2个品种受盐胁迫的影响较大。耐盐品种对盐胁迫耐受性较强可能是因为在无盐胁迫时本身含水量较低,适当的氯化钠浓度增加了其吸水量,而敏盐品种在无盐胁迫时含水量较高,盐胁迫时含水量没有增加,植株体内离子强度升高对植株的生长造成了胁迫。

In this study, sodium chloride solution with concentration of 0.4%, 0.8%, 1.2%, 1.6% and 2.0% were selected for the treatment of Jinmian 8, Long Mi 8, Nei Mi.5, Ning Mi 14 and Ning Mi 16 millet seedlings treated with salt stress, and the salt tolerance of five cultivars was compared. The results showed that the tolerance of different millet varieties to salt stress was different, the aboveground and root biomass were affected by NaCl stress, and the effects of sodium chloride on plant height, root length and water content of Ningyi 16 were not significant. When the salt concentration was 1.6%, the dry weight reached the maximum. And the highest dry weight of Jinmian 8 and Longmi 8 were 0.8% and 0.4%, respectively. The other two cultivars were more affected by salt stress. The tolerance of salt-tolerant cultivars to salt stress is probably due to the low water content under salt-tolerant stress; the proper salt concentration increased its water absorption. While the salt-sensitive cultivars had higher water content without salt stress and the water content was not increased under salt stress, thus the increase of ionic strength in the plant could cause stress on plant growth.