植物延缓剂对盐碱胁迫下羊柴幼苗根系形态的影响

应用盆栽控盐方法,通过模拟毛乌素沙地实际盐碱状况,研究不同质量浓度(0,150,300,450,600mg/L)植物延缓剂(以多效唑为例)对盐碱处理(全盐量0.94g/kg,处理时间3个月)下羊柴(Hedysarum laeve)根系形态特征的影响。结果表明:(1)盐碱胁迫会抑制羊柴根长的生长,降低根系与土壤结合面积及分支强度。其中,分叉数和交叉数所受的抑制作用最明显,分别较对照降低了77.54%,87.70%。(2)多效唑处理会促进羊柴根的生长,600mg/L多效唑处理后羊柴根长、根尖数、分叉数、交叉数、根表面积、根体积分别较单独施盐处理增加了87.66%,116.62%,136.11%,302.25%,57.50%,31.33%,说明多效唑可以缓解羊柴的盐害作用。(3)综合考虑6项根系形态指标,质量浓度为600mg/L的多效唑对提高羊柴耐盐性的效果最佳。

Effects of Paclobutrazol on Root Morphology of Hedysarum laeve Seedlings Under Saline-alkali Stress

The pot experiment was conducted to study the effects of paclobutrazol with different concentrations(0 mg/L,150 mg/L,300 mg/L,450 mg/L,600 mg/L) on the root morphology of Hedysarum laeve under the saline-alkali stress (0.94 g/ kg total salt content) for three months.The results showed:(1) the root lengths were reduced,combined area between roots and soil and branching intensity were decreased under the saline-alkali stress.The forks and crossings were inhibited by 77.54％ and 87.70％;(2) the application of paclobutrazol promoted the root growth,compared with single salt application,the root length,root tips,root forks,root crossings,root surface area and root volume increased by 87.66％,116.62％,136.11％,302.25％,57.50％,31.33％,respectively,under 600 mg/L paclobutrazol treatment,which revealed that paclobutrazol application could release the salt stress on Hedysarum laeve;(3) considered the above six root morphology indexes,the improving effect of 600 mg/L paclobutrazol on salt tolerance of Hedysarum laeve was the best.