Chang Li-Fang, Fei Jiao, Wang You-Shao, Ma Xiao-Yu, Zhao Yan, Cheng Hao
South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China.
College of Life Science and Agroforestry, Qiqihaer University, Qiqihaer 161006, China.
Plants (Basel). 2023 Nov 7;12(22):3786. doi: 10.3390/plants12223786.
Mangrove plants demonstrate an impressive ability to tolerate environmental pollutants, but excessive levels of cadmium (Cd) can impede their growth. Few studies have focused on the effects of apoplast barriers on heavy metal tolerance in mangrove plants. To investigate the uptake and tolerance of Cd in mangrove plants, two distinct mangrove species, and , are characterized by unique apoplast barriers. The results showed that both mangrove plants exhibited the highest concentration of Cd in roots, followed by stems and leaves. The Cd concentrations in all organs of consistently exhibited lower levels than those of . In addition, displayed a reduced concentration of apparent PTS and a smaller percentage of bypass flow when compared to . The root anatomical characteristics indicated that Cd treatment significantly enhanced endodermal suberization in both and roots, and exhibited a higher degree of suberization. The transcriptomic analysis of and roots under Cd stress revealed 23 candidate genes involved in suberin biosynthesis and 8 candidate genes associated with suberin regulation. This study has confirmed that suberized apoplastic barriers play a crucial role in preventing Cd from entering mangrove roots.
红树林植物表现出令人印象深刻的耐受环境污染物的能力，但过量的镉（Cd）会阻碍其生长。很少有研究关注质外体屏障对红树林植物重金属耐受性的影响。为了研究红树林植物对镉的吸收和耐受性，两种不同的红树林物种，[物种名称1]和[物种名称2]，具有独特的质外体屏障。结果表明，两种红树林植物根部的镉浓度最高，其次是茎和叶。[物种名称1]所有器官中的镉浓度始终低于[物种名称2]。此外，与[物种名称2]相比，[物种名称1]的表观质外体运输浓度降低，旁路流百分比更小。根部解剖特征表明，镉处理显著增强了[物种名称1]和[物种名称2]根部内皮层的栓质化，且[物种名称1]表现出更高程度的栓质化。对镉胁迫下[物种名称1]和[物种名称2]根部的转录组分析揭示了23个参与栓质生物合成的候选基因和8个与栓质调节相关的候选基因。本研究证实，栓质化的质外体屏障在阻止镉进入红树林根部方面起着关键作用。
