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[目的]探究烯效唑对不同耐旱性甘薯苗期根系生理生化特性的影响。[方法]通过温室水培方式,采用PEG-6000模拟连续干旱法,研究了外源烯效唑对不同耐旱性甘薯苗期根系的生理生化特性影响。[结果]与正常供水处理相比,干旱显著降低了济薯21和济黑1的根长、根表面积、根平均直径和根体积,但济黑1的根长、根表面积和根平均直径降幅较大,根体积的降幅较小;2个品种的SOD、POD、APX活性和MDA含量均增高,根系活力均降低,但济薯21的SOD、POD和APX活性增幅较大,MDA增幅较小,根系活力降幅较小;2个品种苗期根系的IAA、GAs和ZR含量显著降低,ABA含量显著增加,但济薯21苗期根系的IAA、GAs和ZR含量降幅较小,ABA含量增幅也较小。在干旱处理中,烯效唑对济黑1的根长、根表面积增幅较大,对其根体积的增幅较小;烯效唑对济黑1的SOD、POD、APX活性和根系活力增幅较大,MDA含量降幅也较大;烯效唑对济黑1苗期根系的IAA、ZR和ABA含量增幅均高于济薯21。[结论]耐旱性强的济薯21主要通过提高干旱胁迫下的抗氧化酶活性和维持较高的IAA、ZR和ABA含量,以提高细胞质膜完整性和植株根系活力;烯效唑对干旱条件下干旱敏感型济黑1的调控效果更明显。
[Objective] The research aimed to investigate the effects of Uniconazole on the physiological and biochemical characteristics of different drought-tolerant sweet potato seedling roots. [Method] The effects of exogenous uniconazole on the physiological and biochemical characteristics of different drought-tolerant sweet potato seedling roots were studied by means of greenhouse hydroponics and PEG-6000 simulated continuous drought. [Result] Compared with normal water supply, drought significantly reduced the root length, root surface area, root mean diameter and root volume of Jishu 21 and Jinan 1, but the root length, root surface area and root mean diameter of Ji’uai 1 decreased The activities of SOD, POD, APX and MDA in the two cultivars increased and the root activities decreased, but the activity of SOD, POD and APX in Jishu 21 increased more and MDA increased less , While the root activity decreased slightly. The contents of IAA, GAs and ZR in roots of two cultivars decreased significantly and ABA content increased significantly. However, the content of IAA, GAs and ZR in root of Jishu 21 decreased less, and the increase of ABA content Smaller. In the arid treatment, the effect of uniconazole on root length and root surface area of Jihei 1 was larger, and the increase of its root volume was less. The effect of uniconazole on the activities of SOD, POD, APX and root vigor of Ji’nan 1 was more significant Large and MDA content decreased significantly. The content of IAA, ZR and ABA of uniconazole in roots of Ji’ge 1 was higher than that of Jishu 21. [Conclusion] The high-drought-tolerant Jishu 21 could enhance the plasma membrane integrity and plant root activity by increasing the antioxidant enzyme activities and maintaining the high contents of IAA, ZR and ABA under drought stress. The effects of uniconazole on drought Under the conditions of drought-sensitive Jinan black 1 regulation effect is more obvious.