3种盐胁迫对桂桑优12种子萌发特性的影响

[目的]研究不同盐胁迫对桂桑优12种子萌发的影响,分析其对不同盐胁迫的耐受性,为新疆桑树引种和推广提供理论依据.[方法]以桑树品种桂桑优12种子为试材,采用0.025～0.25 mol/L的碱性混合盐(NaCl+Na2 CO3)、中性单盐(NaCl)和中性混合盐(NaCl+Na2 SO4)胁迫处理种子,测定发芽率、发芽...

Effects of Three Kinds of Salt Stress on Seed Germination Characteristics of Guisangyou Mulberry 12

【Objective】 To study the effects of three kinds of salt stress on seed germination of Guisangyou mulberry 12 and determine the tolerance of Guisangyou mulberry 12 to different salt stress,which provides theoretical basis for the introduction and popularization of mulberry in Xinjiang. 【Method】 Guisangyou mulberry 12 seeds were treated with 0.025-0.25 mol/L neutral single salt (NaCl), basic mixed salt (NaCl+Na₂CO₃) and neutral mixed salt (NaCl+Na₂SO₄) respectively. The germination rate, germination potential, germination index, vigor index, proline and malondialdehyde content were measured. Meanwhile, the salt tolerance of Guisangyou mulberry 12 seeds was comprehensively evaluated by the method of subjection function. 【Results】 With the increase of the concentration of the three salts, the germination rate, germination potential, germination index and vigor index of Guisangyou mulberry 12 seeds all decreased, while the contents of proline and malondialdehyde all increased. The regression relationship between seed germination rate and salt concentration was significant in Guisangyou mulberry 12. Under three salt stresses of alkaline mixed salt, neutral single salt and neutral mixed salt, the appropriate germination concentrations of Guisangyou mulberry 12 seeds were 0.043,1 mol/L, 0.040,8 mol/L and 0.036,4 mol/L, respectively, and the salt tolerance limits were 0.252,4 mol/L, 0.295,9 mol/L and 0.290,5 mol/L, respectively. The comprehensive evaluation values of seed germination of Guisangyou mulberry 12 on three salts tresses resistance were 3.565, 3.905 and 5.027, respectively. 【Conclusion】 The stress of three kinds of salt solution on seed germination of Mulberry mulberry 12 is the most serious alkaline mixed salt and the lightest neutral mixed salt.