内蒙古地区沙生野生蔬菜沙葱耐旱生理特性研究

Study on Physiological Characteristics of Drought Tolerance in Sandy Wild Vegetable Allium mongolicum from Inner Mongolia

全球土壤沙漠化严重,沙漠化土壤治理对于全球经济的可持续性发展具有重要的战略意义。沙葱是一种重要的沙生野生蔬菜,其耐旱研究对阐明植物耐旱机制具有重要意义。该试验以沙葱为材料,采用不同土壤含水量和不同浓度PEG-6000对沙葱进行干旱胁迫处理。研究了相对含水量、细胞膜透性、丙二醛、游离脯氨酸含量及过氧化物酶活性的变化规律。结果表明:土壤干旱和PEG胁迫下,丙二醛和游离脯氨酸含量变化趋势存在差异:随土壤含水量缓慢下降,细胞膜透性增加,丙二醛和游离脯氨酸含量呈上升趋势;PEG胁迫下,丙二醛含量则呈现"先升后降"的变化趋势,游离脯氨酸呈现"升→降→升→降"的变化趋势。过氧化物酶活性呈"先升后降再升"的趋势。该研究结果将为沙葱耐旱能力的阐明提供依据。

Desertification in the world is very serious.Governing soil desertification has important strategic significance for the sustainable development of the global economy.Allium mongolicum Regel is an important sandy wild vegetable,and studying its drought tolerance mechanism is of great significance in elucidating plant drought tolerance mechanism.Under drought stress,the osmotic balance of plant cells is destroyed and related physiological indexes change.Using different soil water content and different PEG-6000 concentrations to simulated drought,A.mongolicum was selected as the material,physiological indexes related to drought tolerance were measured,and the physiological mechanisms of drought tolerance were studied.The free proline content,malondialdehyde content,relative water content,plant cell membrane permeability as well as POD activity of A.mongolicumunder drought stress were measured.The results showed that with droughts increasing,free proline and MDA contents increased overall,while with PEG increasing,MDA contents increased initially and then decreased,free proline increased firstly,then decreased,increased again,decreased lastly.Relative water content decline gradually,membrane permeability increased,while the POD activity increased initially and then decreased.The results will lay the foundation for clarifying the physiological mechanism of drought tolerance in A.mongolicumunder drought stress.