紫穗槐幼苗根系形态对NaCl盐胁迫的响应

目的]探究紫穗槐幼苗根系形态对NaCl盐胁迫的适应特征,为盐渍化地区植被优化及恢复提供理论依据。方法]以1 a生紫穗槐幼苗为试材,分析紫穗槐幼苗株高、基径和根长、表面积、体积、根尖数等重要的根系形态特征指标。结果]随着盐浓度的增加,紫穗槐幼苗株高、基径和总根、中根各构型指标均呈现先升高后下降的趋势;盐浓度为0.3%时,除细根体积外,各指标达到最大值,且均表现显著促进作用(p0.05);盐浓度达到0.9%时,各指标受到了显著抑制(p0.05)。结论]当盐浓度为0.3%时,对紫穗槐根系生长有促进作用;当盐浓度达到0.9%时,其生长明显受到抑制。

Responses of Root Morphology of Amorpha Fruticosa to NaCl Saline Stress

Objective] The adaption of Amorpha fruticosa through root morphological responses to saline stress was explored, in order to provide support for vegetation optimization and restoration in saline areas.Methods] we used the annual Amorpha fruticosa seedlings as test materials, and analyzed plant height, basal diameter and the root morphological characteristics such as root length, surface area, volume, and number of root tips of Amorpha fruticosa seedlings under saline stress.Results] As the salt concentration increases, the plant height, basal diameter, and total root and middle root configuration indexes of Amorpha fruticosa increased first and then decreased. When the saline concentration was 0.3%, except for the fine root volume, all other indexes reached the maximum value, and all showed significant promotion effects (p<0.05). When the saline concentration was 0.9%, all indicators were significantly inhibited (p<0.05).Conclusion] When the saline concentration was 0.3%, the root growth of Amorpha fruticosa was significantly promoted; when the concentration was higher than 0.5%, the root system showed different degrees of growth declining; when the saline concentration reached 0.9%, its growth was significantly inhibited.