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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。
Globally desertification is so serious that soil desertification control is of strategic importance to the sustainable development of the global economy. Scallion is an important sandy wild vegetable, and its drought tolerance research is of great significance to elucidate the mechanism of plant drought tolerance. In this experiment, Allium mongolicum was used as material to treat the Allium sativum by drought stress with different soil water content and different concentrations of PEG-6000. The changes of relative water content, cell membrane permeability, malondialdehyde, free proline content and peroxidase activity were studied. The results showed that there was a difference in the content of malondialdehyde and free proline under soil drought and PEG stress. The content of MDA and free proline increased with the decrease of soil water content and the increase of cell membrane permeability. The content of PEG Under stress, the content of malondialdehyde showed a trend of “first rising later then decreasing”, and the free proline showed a tendency of “rising, decreasing, rising and falling”. Peroxidase activity showed the trend of “rising first then decreasing then rising”. The results of this study will provide the basis for elucidating the drought tolerance of Allium mongolicum.