State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A & F University, Yangling 712100, Shaanxi, China.
State Key Laboratory of Crop Stress Biology for Arid Areas/Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A & F University, Yangling 712100, Shaanxi, China.
Ecotoxicol Environ Saf. 2021 Dec 1;225:112734. doi: 10.1016/j.ecoenv.2021.112734. Epub 2021 Sep 2.
Cadmium (Cd), a phytotoxic heavy metal accumulated in plants and fruits, has significant adverse effects on plant growth and development as well as human health. In particular, Cd pollution has become a serious agricultural issue in recent years. Apple is one of the most popular fruits consumed at the global scale. Improving apple Cd resistance via reductions in Cd absorption can benefit apple tree growth and ensure fruit safety. In this study, we determined that, under the 200 μM Cd treatment, 35S::MdIAA24 apple plants exhibited more biomass and less Cd accumulation in the tested tissues compared to wild type (WT). Furthermore, the 35S::MdIAA24 apple plants demonstrated more favorable photosynthesis characteristics, less reactive oxygen species (ROS) and a greater amount of active antioxidant enzymes under the Cd condition than WT. The expression levels of the Cd uptake genes were observed to be lower in the 35S::MdIAA24 apple plants compared with those of the WT under the Cd treatment. The results highlight the ability of the overexpression of MdIAA24 to enhance apple Cd resistance by improving antioxidant capacity and reducing Cd absorption.
镉（Cd）是一种在植物和果实中积累的植物毒性重金属，对植物的生长发育以及人类健康具有显著的不良影响。特别是，近年来，镉污染已成为一个严重的农业问题。苹果是全球范围内最受欢迎的水果之一。通过减少 Cd 吸收来提高苹果的 Cd 抗性可以促进苹果树的生长并确保果实安全。在本研究中，我们发现，在 200 μM Cd 处理下，与野生型（WT）相比，35S::MdIAA24 苹果植株在测试组织中表现出更多的生物量和更少的 Cd 积累。此外，与 WT 相比，35S::MdIAA24 苹果植株在 Cd 条件下具有更好的光合作用特性、更少的活性氧（ROS）和更多的活性抗氧化酶。在 Cd 处理下，35S::MdIAA24 苹果植株中 Cd 摄取基因的表达水平低于 WT。这些结果突出了过表达 MdIAA24 通过提高抗氧化能力和减少 Cd 吸收来增强苹果 Cd 抗性的能力。
