低钾胁迫对饲用燕麦生长和生理生化特性的 影响

打开文本图片集

中图分类号：S544.9 文献标识码：A 文章编号：1007-0435（2025）05-1425-09

Abstract：To investigate the effects of potassium deficiency on the growth and physiological-biochemical characteristics ofdiferent oat varieties，this study focused on 16oat varieties.Two potassium concentrations，normal potassium （2mmol⋅L-1KCl） and low potassium （0.01mmol⋅L-1KCl） ，were applied. After 21 days of treatments at the seedling stage，agronomic traits and physiological-biochemical indices were analyzed to screen for oat varieties resistant to low potassium stress.The results showed that，compared to normal potassium conditions，underlow potassum stress，the plant height of six oat varieties significantly decreased，the root length of four varieties significantly decreased，and the above-ground biomassof two varieties significantly decreased.In contrast，the above-ground biomass of nine oat varieties significantly increased. The activities of peroxidase， superoxide dismutase，catalase，and the contentof malondialdehyde significantly increased in most ofoat variet ies，while root vitality showed a significant increase.Additionally，potassium content in the above-ground part of the plants significantly decreased.Grey relational analysis of agronomic traits and physiological-biochemical indices revealed that‘Forage Plus’‘SO-1’ and‘Baler 2’were relatively more resistant to low potasium stress，while‘Haymaker’‘Longyan No. 5′ and ‘Adremo’ were sensitive to low potassium. Key words：Oat;Low potassium stress;Tolerance;Physiological and biochemical; Variety screening;Grey relational analysis

燕麦（AvenasatiuaL.）是禾本科燕麦属一年生草本植物，是重要的粮饲兼用作物，具有耐瘠薄、耐盐碱、耐干旱、耐严寒等突出抗逆特性，适应性强，可大范围推广种植[1]。（剩余12271字）