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Effect of single and combined Cu, NaCl and water stresses on three Atriplex species with phytostabilization potential
South African Journal of Botany ( IF 2.7 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.sajb.2020.02.021
Fabiola Orrego , Claudia Ortíz-Calderón , Stanley Lutts , Rosanna Ginocchio

Abstract Phytostabilization of metal enriched substrates in arid and semiarid areas depends on the use of metal-tolerant or metallophyte plants in order to decrease metal mobilization and dispersion. However, the co-occurrence of other abiotic restrictions on plant growth, such as drought and salinity calls for a new perspective for plant selection. Since components of salt and drought tolerance traits of halophytes are also present in metal stress, Atriplex species, typical of dry and salty soils, emerge as good candidates for phytostabilization. But in order to confirm this potential, it is necessary to explore specific responses to increasing copper, salt and water stress. In this study, we compared the effect of single and combined copper, NaCl and PEG- induced water stresses on growth parameters of the Chilean Atriplex atacamensis, European A. halimus and Australian A. nummularia under controlled hydroponic assays. Results showed that increasing copper had severe effects on root development of all three species, with subsequent effects on their shoot biomass. Salt stress effects were mostly osmotic, with a decrease in shoot fresh weight and water content, and PEG- induced water stress had no clear effect on growth of roots and shoots. Combination of copper with NaCl and PEG further decreased plant growth, but this effect varied among Atriplex species. This shows that growth of Atriplex species responds differently to each individual stress and that stressor combination causes an overall negative effects in their growth parameters.

中文翻译:

Cu、NaCl和水胁迫对三种具有植物稳定潜力的Atriplex物种的单一和组合胁迫的影响

摘要 干旱和半干旱地区富含金属的基质的植物稳定性取决于使用耐金属或金属植物植物,以减少金属的迁移和分散。然而,同时发生的其他非生物限制对植物生长的限制,如干旱和盐度,需要对植物选择提出新的观点。由于盐生植物的耐盐和耐旱性状的成分也存在于金属胁迫中,典型的干旱和咸土壤的 Atriplex 物种成为植物稳定的良好候选者。但为了证实这种潜力,有必要探索对增加的铜、盐和水压力的具体反应。在这项研究中,我们比较了单独和组合的铜、NaCl 和 PEG 诱导的水分胁迫对智利 Atriplex atacamensis、欧洲 A. 控制水培试验下的 halimus 和澳大利亚 A. nummularia。结果表明,增加铜对所有三个物种的根发育都有严重影响,随后对它们的地上部生物量产生影响。盐胁迫作用多为渗透性,地上部鲜重和含水量降低,PEG诱导的水分胁迫对根系和地上部的生长没有明显影响。铜与 NaCl 和 PEG 的组合进一步降低了植物生长,但这种效果因 Atriplex 物种而异。这表明 Atriplex 物种的生长对每个个体压力的反应不同,并且压力源组合对其生长参数产生整体负面影响。结果表明,增加铜对所有三个物种的根发育都有严重影响,随后对它们的地上部生物量产生影响。盐胁迫作用多为渗透性,地上部鲜重和含水量降低,PEG诱导的水分胁迫对根系和地上部的生长没有明显影响。铜与 NaCl 和 PEG 的组合进一步降低了植物生长,但这种效果因 Atriplex 物种而异。这表明 Atriplex 物种的生长对每个个体压力的反应不同,并且压力源组合对其生长参数产生整体负面影响。结果表明,增加铜对所有三个物种的根发育都有严重影响,随后对它们的地上部生物量产生影响。盐胁迫作用多为渗透性,地上部鲜重和含水量降低,PEG诱导的水分胁迫对根系和地上部的生长没有明显影响。铜与 NaCl 和 PEG 的组合进一步降低了植物生长,但这种效果因 Atriplex 物种而异。这表明 Atriplex 物种的生长对每个个体压力的反应不同,并且压力源组合对其生长参数产生整体负面影响。PEG诱导的水分胁迫对根和芽的生长没有明显影响。铜与 NaCl 和 PEG 的组合进一步降低了植物生长,但这种效果因 Atriplex 物种而异。这表明 Atriplex 物种的生长对每个个体压力的反应不同,并且压力源组合对其生长参数产生整体负面影响。PEG诱导的水分胁迫对根和芽的生长没有明显影响。铜与 NaCl 和 PEG 的组合进一步降低了植物生长,但这种效果因 Atriplex 物种而异。这表明 Atriplex 物种的生长对每个个体压力的反应不同,并且压力源组合对其生长参数产生整体负面影响。
更新日期:2020-07-01
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