a Department of Horticulture , College of Agriculture, Isfahan University of Technology , Isfahan , Iran.
b Yunnan Academy of Agricultural Sciences , Yunnan , China.
Int J Phytoremediation. 2018 Jun 7;20(7):730-738. doi: 10.1080/15226514.2017.1413338.
To test the possibility that using appropriate rootstocks could improve the tolerance of watermelon to cadmium (Cd) toxicity, a greenhouse experiment was conducted to determine growth and antioxidant activities of watermelons, either nongrafted or grafted onto summer squash and winter squash. We provided nutrient solutions having four levels (0, 50, 100, and 200 μM) of cadmium to treat the plants. Shoot and root biomass reduction were significantly lower in summer squash rootstock-grafted watermelon than winter squash rootstock-grafted and nongrafted watermelons. Cadmium induced a smaller decrease in leaf area index in grafted watermelons compared with nongrafted plants. The Cd- related reductions in chlorophyll content and efficiency of photosynthesis were more severe in nongrafted watermelons compared with dose grafted onto summer squash. Cd accumulation in shoot at the highest dose (200 µM) of CdCl was significantly lower (19.76 mg/kg) in summer squash rootstock-grafted watermelon compared with winter squash rootstock-grafted (37.58 mg/kg) and nongrafted watermelon (72.12 mg/kg). HO, MDA production and electrolyte leakage of summer squash rootstock-grafted watermelon showed less increase, which was associated with a significant increase in the activities of antioxidant. The improved crop performance of grafted watermelons was attributed to their strong capacity to inhibit Cd accumulation in the aerial parts.
为了检验使用合适的砧木是否能提高西瓜对镉毒性的耐受性，我们进行了温室实验，以确定未嫁接或嫁接到西葫芦和南瓜砧木上的西瓜的生长和抗氧化活性。我们提供了含有 4 个镉水平（0、50、100 和 200 μM）的营养液来处理植物。与南瓜砧木嫁接的西瓜的地上部和根生物量减少显著低于西葫芦砧木嫁接和未嫁接的西瓜。与未嫁接的植株相比，嫁接西瓜的叶面积指数在镉处理下的下降幅度较小。与未嫁接的西瓜相比，嫁接的西瓜的叶绿素含量和光合作用效率对 Cd 的相关降低较小。在最高剂量（200 µM）的 CdCl 处理下，嫁接在西葫芦砧木上的西瓜地上部的 Cd 积累量（19.76 mg/kg）显著低于嫁接在南瓜砧木上的西瓜（37.58 mg/kg）和未嫁接的西瓜（72.12 mg/kg）。与南瓜砧木嫁接的西瓜的 HO、MDA 产量和电解质渗漏的增加较少，这与抗氧化活性的显著增加有关。嫁接西瓜的作物表现改善归因于它们抑制地上部 Cd 积累的能力较强。
