Tai Zhenglan, Yin Xinqiang, Fang Zhigang, Shi Gaoling, Lou Laiqing, Cai Qingsheng
College of Life Sciences, Nanjing Agricultural University, 210095 Nanjing, China.
Kashghar University, 844006 Kashghar, China.
Int J Environ Res Public Health. 2017 Jul 29;14(8):852. doi: 10.3390/ijerph14080852.
Strigolactones (SLs) are classified into plant hormones, playing a key role as a mediator of plant growth in response to several abiotic stresses, including drought and salinity. However, the role of SLs in cadmium (Cd)-induced stress to plants is still unknown. The physiological responses of switchgrass () stressed in 10 μmol L Cd to exogenous synthetic SLs analog, GR24 were studied in hydroponics. The Cd stress significantly caused the adverse effects on plant growth and root morphology, inhibited photosynthesis, but boosted lipid peroxidation of Switchgrass seedlings. After treatment of 1 μmol L GR24, the above adverse effects caused by Cd stress were significantly alleviated, mainly reflects in improvement of shoot biomass, relative water content, root development, chlorophyll contents, activities of typical antioxidant enzymes, nutrient uptake. The reason for exogenous GR24 alleviating cadmium toxicity might be owing to that exogenous GR24 promoted the content of endogenous SLs, increased some essential element Fe (iron), Zn (zinc), Mn (manganese) and Cu (copper) uptake and reduced cadmium uptake, accumulation and partition in shoot of switchgrass seedlings.
独脚金内酯（SLs）被归类为植物激素，在植物响应包括干旱和盐度在内的多种非生物胁迫时作为植物生长的调节因子发挥关键作用。然而，SLs在镉（Cd）诱导的植物胁迫中的作用仍不清楚。在水培条件下研究了10 μmol/L Cd胁迫下柳枝稷对外源合成SLs类似物GR24的生理响应。Cd胁迫显著对植物生长和根系形态产生不利影响，抑制光合作用，但增强了柳枝稷幼苗的脂质过氧化。用1 μmol/L GR24处理后，Cd胁迫引起的上述不利影响得到显著缓解，主要体现在地上部生物量、相对含水量、根系发育、叶绿素含量、典型抗氧化酶活性、养分吸收的改善。外源GR24缓解镉毒性的原因可能是外源GR24促进了内源SLs的含量，增加了一些必需元素铁（Fe）、锌（Zn）、锰（Mn）和铜（Cu）的吸收，并减少了镉在柳枝稷幼苗地上部的吸收、积累和分配。
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