不同盐碱胁迫对棉花种子萌发的影响

摘要

为探讨不同盐碱胁迫下棉花种子的耐盐性.选取6个棉花品种新陆早45号(X 45)、新陆早61号(X 61)、中棉73号(Z 73)、中棉92号(Z 92)、鲁棉研24号(L 24)和鲁棉研28号(L 28)为研究对象,设置 NaCl、Na2SO4和 Na2CO3+NaHCO33种胁迫类型,分析不同盐碱类型及浓度对棉花种子萌发的影响.在 NaCl、Na2SO4和 Na2CO3+NaHCO33种盐碱胁迫中,总体上各品种发芽系数、日均发芽率、相对发芽指数、相对发芽势和相对发芽率随着盐分浓度増大皆呈下降趋势.相同浓度中性盐,Na2SO4胁迫比 NaCl胁迫更严重,在 Na2SO4浓度为300 mmol/L时各品种均未萌发.在碱性盐处理 pH=8.60时促进 L 28萌发,当 pH=9.03时产生抑制作用,所有品种在 pH=10.47时不再萌发.结果表明NaCl 和 Na2SO4盐胁迫时优势品种为 L 24和Z 92号,Na2CO3+NaHCO3型碱胁迫优势品种为 L 24和 X 45号.%In order to study the salt tolerance of cotton seeds under different salt and alkali stress.Six varieties of cotton(X 45,X 61,Z 73,Z 92,L 24 and L 28)were selected as the object of study,and three stress types of NaCl,Na2SO4and Na2CO3+NaHCO3were set up.The effects of different salt types and concentration treatments on cotton seed germination were analyzed.Under these three stresses, germination factor,daily germination rate,relative germination index,relative germination potential and relative germination rate of each cultivar decreased with the increase of salt concentration.The same concentration of neutral salt,Na2SO4stress more serious than NaCl stress,When the concentra-tion of Na2SO4was 300 mmol/L,all seeds were not germinated.In the Na2CO3+NaHCO3solution pH=8.60 to promote the germination of L 28,when the pH=9.03 inhibited,at pH=10.47 all varieties no germination.The results showed that the dominant varieties were L 24 and Z 92,which were composed of NaCl and Na2SO4,and the dominant varieties of Na2CO3+NaHCO3were L 24 and X 45.