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试验采用1/2Hoagland营养液水培,研究不同浓度K+对甜菜幼苗生长和生理生化指标的影响。结果表明,甜菜幼苗叶片、叶柄、根系和整株的干物质量均随钾素浓度提高而增加,在K+浓度为3.00 mmol/L时最高;随K+浓度提高,甜菜幼苗根系、叶柄、叶片钾含量,幼苗全氮、磷、钾积累量,叶片、叶柄含水量,叶片相对含水量以及叶片面积随之逐步升高,3.00与6.00 mmol/L K+处理无明显差异;叶片叶绿素a、叶绿素b、叶绿素a+b含量,SOD、GPX活性,根系、叶柄和叶片全N含量随之逐步下降,3.00与6.00 mmol/L K+处理无明显差异;叶片CAT活性,根系、叶柄和叶片P含量保持不变或变化无规律。在本研究条件下,3.00 mmol/L K+是甜菜幼苗生长最佳营养浓度。
The experiment used 1 / 2Hoagland nutrient solution hydroponics to study the effects of different concentrations of K + on the growth and physiological and biochemical indexes of sugar beet seedlings. The results showed that the dry matter content of sugarbeet seedling leaves, petioles, roots and whole plants increased with the increase of potassium concentration, and reached the highest at K + concentration of 3.00 mmol / L. With the increase of K + concentration, the dry matter content of sugarbeet seedling roots, , The accumulation of total N, P and K, the water content of leaves and petioles, the relative water content of leaves and the leaf area increased gradually. There was no significant difference between 3.00 and 6.00 mmol / L K + treatment. The contents of chlorophyll a, chlorophyll b, The contents of a + b, SOD and GPX, the content of total N in roots, petioles and leaves decreased with the increase of 3.00 and 6.00 mmol / L K + treatments. CAT activity, P content in roots, petioles and leaves were unchanged or No change in the law. Under the conditions of this study, 3.00 mmol / L K + is the optimum nutrient concentration for the growth of sugar beet seedlings.