Effects of Compound Saline-Alkali Stress on Germination Period of Different Foxtail Millet Varieties and Screening of Saline-Alkali Tolerance Varieties
In order to explore the influence of compound saline-alkali stress on the germination of different foxtail millet varieties,100 foxtail millet varieties were studied.Two neutral salts(Na2SO4,NaCl)and two alkaline salts(NaHCO3,Na2CO3)were selected and mixed according to the molar ratio of 4∶1∶4∶1 and five tested varieties were randomly selected for salt-alkali tolerance concentration screening,eight treatments(0,20,40,60,80,100,120 and 150 mmol/L)were set.The germination rate of foxtail millet varieties under saline-alkali stress during germination stage and its influence on roots and buds were studied.The results showed that 80 mmol/L saline-alkali solution was the optimum concentration for screening the salt-alkali tolerance of foxtail millet during germination.The saline-alkali tolerance of 100 foxtail millet varieties at germination stage were comprehensively evaluated at 80 mmol/L saline-alkali concentration.The results showed that the differences among varieties reached significant and extremely significant levels,and the coefficient of variation of each characteristic was from small to large:relative germination rate,relative germination index,relative bud length,relative bud dry weight,relative bud fresh weight,relative germination potential,relative root length,relative root fresh weight and relative root dry weight.According to the comprehensive score value(D),100 foxtail millet varieties were divided into four grades of saline-alkali tolerance,including eight varieties with extreme saline-alkali tolerance,11 varieties with saline-alkali tolerance,62 varieties with moderate saline-alkali tolerance and 19 saline-alkali sensitive varieties.
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