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[目的]研究铅胁迫对灰绿藜和小藜2种植物种子萌发和幼苗生长的影响。[方法]以灰绿藜和小藜2种藜科植物为研究对象,初步研究了不同浓度铅胁迫对其种子萌发、幼苗生长的影响以及相应铅质量浓度对叶片SOD、POD、CAT水平的影响。[结果]2种藜种子的发芽势随着铅浓度的增加呈现先增加后下降的趋势,小藜和灰绿藜种子的发芽势分别在25和50 mg/L铅溶液浓度下达到最大;而发芽率、发芽指数和活力指数随着处理浓度的升高而降低,同时芽长和根长也逐渐降低。灰绿藜和小藜叶片SOD、POD、CAT的活性随着铅处理浓度的增加整体呈先上升后下降的趋势,灰绿藜和小藜幼苗SOD及POD活性分别在200、100 mg/kg铅浓度下达到最高,而CAT的活性则在100 mg/kg铅浓度时达到最大。[结论]2种藜对铅胁迫具有较强的耐受性,可作为土壤铅污染富集植物的备选物种。
[Objective] The research aimed to study the effects of lead stress on seed germination and seedling growth of two plants of Chenopodium glaucum and Chenopodium album. [Method] With two kinds of Chenopodiaceae plants, Chenopodium glaucum and Chenopodium glaucum as the research objects, the effects of different concentrations of lead on the seed germination and seedling growth and the effects of the corresponding Pb concentration on SOD, POD and CAT were studied . [Result] The germination potentials of two kinds of quinoa seeds tended to increase at first and then decrease with the increase of lead concentration. The germination potential of seeds of Quinoa and Chenopodium glaucum reached the maximum under the Pb and Pb concentrations of 25 and 50 mg / L, respectively. Germination rate, germination index and vigor index decreased with the increase of treatment concentration, and the bud length and root length also decreased gradually. The activities of SOD, POD and CAT in the leaves of Chenopodium glaucum and Chenopodium glaucum increased firstly and then decreased with the increasing of the Pb treatment. The activities of SOD and POD in the leaves of Chenopodium glaucum and Chenopodium album were 200,100 mg / kg Concentration reached the highest, while CAT activity reached the maximum at 100 mg / kg lead concentration. [Conclusion] The two kinds of pigweed had strong tolerance to lead stress and could be used as the alternative species for plant enrichment by Pb pollution in soil.