聚乙二醇模拟干旱对甜高粱幼苗生长及抗旱性的影响

Effects of Drought Stress Simulated by PEG on the Growth and the Drought Tolerance of Sweet Sorghum Seedlings

研究了不同浓度聚乙二醇(PEG2000)溶液处理对甜高粱幼苗苗高、鲜重、叶长、脯氨酸以及丙二醛含量的影响。结果表明:不同浓度PEG2000胁迫下,随着PEG2000浓度的升高,甜高粱幼苗的鲜重、苗高和叶长均减小,浓度在20%以下,降低不明显,当浓度达到30%时,显著降低;而丙二醛和脯氨酸含量随着PEG2000浓度的升高均上升,浓度在20%以下,降低不明显,当浓度达到30%时,升高显著。表明甜高粱幼苗在20%PEG2000处理下具有较强的耐旱性,当浓度达到30%时,甜高粱幼苗抗旱性降低,生长受到抑制。

Study on the change of height,fresh weight,leaf length,proline and MDA content of the sweet sorghum seedling at the different concentration of polyethylene glycol（ PEG2000）. The results show that： with the increasing of the concentration of PEG2000,the fresh weight,seedling height and leaf length of sweet sorghum seedling decreased. Under 20% PEG2000,no significant decrease and reduce significantly when 30% PEG2000. With the increasing of the concentration of PEG2000,the content of MDA and proline were increased. PEG2000 Concentration below 20%,no significant increase and increase significantly when 30% PEG2000. The sweet sorghum seedlings have stronger drought resistance under 20% PEG2000,when the concentration is 30%,the drought resistance of sweet sorghum seedling reduce and the growth restrain.