Department of Biotechnology, Faculty of Agricultural Science, Guangdong Ocean University, Zhanjiang, 524088, PR China; Department of Crop Science and Technology, College of Agriculture, South China Agricultural University, Guangzhou, 510642, PR China; Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture, PR China, Guangzhou, 510642, China.
Department of Crop Science and Technology, College of Agriculture, South China Agricultural University, Guangzhou, 510642, PR China; Scientific Observing and Experimental Station of Crop Cultivation in South China, Ministry of Agriculture, PR China, Guangzhou, 510642, China.
Ecotoxicol Environ Saf. 2019 Dec 15;185:109659. doi: 10.1016/j.ecoenv.2019.109659. Epub 2019 Sep 18.
Cadmium (Cd) affects crop growth and productivity by disrupting normal plant metabolism. To determinate whether ultrasonic (US) seed treatment can alleviate Cd stress in rape (Brassica napus L.), the seeds of two oilseed rape cultivars i.e., 'Youyanzao18' and 'Zaoshu104' were exposed to ultrasonic waves for 1 min at 20 KHz frequency. Seeds without US treatment were taken as control (CK). Results revealed that the germination rate of both cultivars was significantly (P < 0.05) higher in US treatment than CK only at 0 and 10 mg Cd L. The shoot and root length of both cultivars were significantly higher in US treatment than CK at all Cd treatments except the root length of Youyanzao18 at 50 mg Cd L. The fresh weight Youyanzao18 was significantly (P < 0.05) higher in US than CK except for Youyanzao18 at 25 mg Cd L. Moreover, the superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) and ascorbate peroxidase (APX) activities and the proline, glutathione (GSH), and soluble protein contents in Youyanzao18 were relatively higher in the US treatment than CK. The malondialdehyde (MDA) contents were prominently reduced in US treatment than CK. The pods per plant, seeds per pod and rapeseed yield were increased by 15.9, 11.4, and 16.4% in Youyanzao18 and 10.3, 9.5, and 11.5% in Zaoshu104, respectively in US treatment, compared to CK. Moreover, the contents of Cd in root, stem, leaf, rape pod shell, and rapeseeds were comparatively less in US treatment than CK whereas the Cd concentrations in different plant parts of both rape cultivars were recorded as: leaf ˃ root ˃ stem ˃ rape pod shell ˃ rapeseed. In sum, the US treatment improved the morphological growth and rapeseed yield whereas reduced the Cd accumulation in different plant parts of rapeseed under Cd contaminated soil.
镉（Cd）通过破坏正常的植物代谢来影响作物的生长和生产力。为了确定超声波（US）种子处理是否可以减轻油菜（Brassica napus L.）中的 Cd 胁迫，将两种油菜品种的种子，即“油研早 18”和“早熟 104”，分别在 20 KHz 频率下进行 1 分钟的超声处理。未进行 US 处理的种子作为对照（CK）。结果表明，在 0 和 10 mg Cd L 时，两种品种的发芽率均显著（P < 0.05）高于 CK 仅在 US 处理。除了在 50 mg Cd L 时，Youyanzao18 的根长外，两种品种的茎和根长均在所有 Cd 处理中均显著高于 CK。除了在 25 mg Cd L 时，Youyanzao18 的鲜重外，Youyanzao18 的鲜重均显著（P < 0.05）高于 CK。此外，在 US 处理中，Youyanzao18 的超氧化物歧化酶（SOD）、过氧化物酶（POD）、过氧化氢酶（CAT）和抗坏血酸过氧化物酶（APX）活性以及脯氨酸、谷胱甘肽（GSH）和可溶性蛋白含量相对高于 CK。丙二醛（MDA）含量在 US 处理中明显低于 CK。与 CK 相比，在 Youyanzao18 中，每株植物的荚数、每荚种子数和油菜籽产量分别增加了 15.9%、11.4%和 16.4%，在 Zaoshu104 中分别增加了 10.3%、9.5%和 11.5%。此外，在 US 处理中，与 CK 相比，根、茎、叶、油菜荚壳和油菜籽中的 Cd 含量均较低，而两种油菜品种的不同植物部位的 Cd 浓度分别为：叶 ˃ 根 ˃ 茎 ˃ 油菜荚壳 ˃ 油菜籽。总之，在 Cd 污染土壤中，US 处理改善了油菜的形态生长和油菜籽产量，同时减少了不同植物部位的 Cd 积累。
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