盐碱胁迫对高羊茅种子萌发和幼苗生长的影响

Effects of mixed saline-alkali stress on seed germination and seedling growth of Festuca arundinacea

摘要:

【目的】 研究不同浓度和不同比例的盐碱溶液对高羊茅种子萌发和幼苗生长的影响。【方法】 以高羊茅（Festuca arundinacea）为试验材料，选取中性盐（NaCl、Na2 SO4 ）和碱性盐（NaHCO3 、Na2 CO3 ） 按照NaCl∶Na2 SO4 ∶NaHCO3 ∶Na2 CO3 的顺序设5个组合：A （1∶1∶0∶0）、B （1∶2∶1∶0）、C （1∶9∶9∶1）、D （1∶1∶1∶1）、E （9∶1∶1∶9），其混合盐碱处理液总浓度均为100、200 mmol/L，测定和分析高羊茅种子发芽和幼苗生长指标。【结果】 随着中性盐溶液浓度升高，高羊茅幼苗苗长、叶片总长、叶总表面积先上升后下降，根长、根系总长度、根总表面积、根尖数下降；随着混合盐碱溶液浓度的升高，高羊茅发芽率、发芽势、发芽指数、相对发芽率、相对发芽势、相对发芽指数、苗长、叶片总长、叶总表面积、根长、根系总长度、根总表面积、根尖数均出现下降，同时相对盐害率升高。200 mmol/L的C、D、E溶液完全抑制高羊茅种子萌发。【结论】 5种不同比例盐碱混合对高羊茅种子萌发和幼苗生长均有不同程度的抑制作用， 其胁迫程度由低到高为：A

Abstract:

【Objective】 To study the effects of saline-alkali solution with different concentrations and propor tions on the seed germination and seedling growth of Festuca arundinacea，【Method】 The experiment used Festuca arundinacea as the experimental material，andneutral salts （NaCl，Na2SO4） and alkaline salts （NaHCO3 ，Na2 CO3 ） are mixed according to a certain molar ratio. According to the order of NaCl∶Na2 SO4 ∶NaHCO3 ∶Na2 CO3 ，they are di vided into five combinations：A（1∶1∶0∶0），B （1∶2∶1∶0），C （1∶9∶9∶1），D （1∶1∶1∶1），and E （9∶1∶1∶9）. The total concentration of the mixed salt alkali treatment solution is set at 100 and 200 mmol/L. By measuring and analyzing the seed germination and seedling growth indicators of Festuca arundinacea.【Result】 It was found that with the in crease of the mixed saline-alkali concentration，the germination rate，germination potential，germination index，rela tive germination rate，relative germination potential，relative germination index，seedling length，total leaf length，total leaf surface area，root length，total root length，total root surface area，and lateral root number of Festuca arundinacea decreased. At the same time，the relative salt damage rate increased. 200 mmol/L solution of C，D，E completely in hibited the germination of Festuca arundinacea seeds.【Conclusion】Five different proportions of mixed saline-alkali have different degrees of inhibition on the seed germination and seedling growth of Festuca arundinacea，and the de gree of stress is from low to high：A