黄秋葵苗期的盐胁迫反应及耐盐阈值分析

摘要

[Objective] To study the response of orka to saline stress and salt tolerance threshold at seeding stage.[Method] Pot experiments were carried out to study the effects of coastal saline alkali soil on growth of okra,salt tolerance index and salt tolerance threshold in the seedling stage of okra were determined through correlation analysis and regression analysis.[Resuh] Plant height,stem diameter,leaf numbers,root length aboveground and underground dry weight were effected,which plant height and stem diameter remarkably decreased,but the impact of leaf numbers was minimal.When salt concentration was higher than 0.4％,with the soil salt cocentration increasing,the dry mass of orka remarkably declined.The dry mass of aboveground was determined as salt tolerance index of orka,the salt tolerance threshold was 0.491％.[Connclusion] Okra has strong salt tolerance,which is suitable for planting in hght and moderate saline alkali area.%[目的]对黄秋葵苗期的盐胁迫反应及耐盐阈值进行分析.[方法]采用盆栽试验,分析不同盐分质量分数的滨海原土对黄秋葵幼苗生长发育的影响,通过相关性分析和回归分析,确定黄秋葵幼苗期耐盐鉴定指标和耐盐阈值.[结果]盐胁迫下幼苗株高、茎粗、叶片数、根长、地上和地下干物质量均受到影响,其中株高和茎粗明显下降,而叶片数所受影响最小;从土壤盐分质量分数为0.4％开始,随着盐胁迫的增加,黄秋葵幼苗的干物质量大幅下降;确定了黄秋葵苗期耐盐鉴定指标为地上干物质重,耐盐阈值为0.491％.[结论]黄秋葵耐盐性较强,适宜在轻、中度盐碱区种植.