Cheng Chen, Liu Jianxiu, Liu Jiahui, Gao Zhiqiang, Yang Yang, Zhu Bo, Yao Fengxian, Ye Qing
Life Sciences College, Gannan Normal University, Ganzhou 341000, China.
South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.
Plants (Basel). 2025 Apr 24;14(9):1291. doi: 10.3390/plants14091291.
The enrichment of cadmium (Cd) is an important factor threatening crop growth and food safety. However, it is unclear whether exogenous selenium (Se) can simultaneously achieve Cd reduction and promote the growth of peppers. This study used Yuefeng 750 and Hongtianhu 101 as materials and investigated the interaction effects of different Se-Cd concentrations (Cd = 2 and 5 μM; Se = 0, 0.5, and 2 μM) on the uptake and transport of Cd and Se, resistance physiology, and growth and development of pepper seedlings in a hydroponic experiment. The organ Cd content was significantly increased in pepper seedlings, inhibiting their growth and aggravating their physiological stress under Cd application. However, the growth and photosynthetic capacity of peppers were promoted after Se application under Cd stress. The superoxide anion (O), hydrogen peroxide (HO), malondialdehyde (MDA), and abscisic acid (ABA) contents and indole-3-acetic acid oxidase (IAAO) activity in the leaves showed a significantly progressive decline, while the proline (Pro), ascorbic acid (ASA), and trans zeatin riboside (ZR) contents showed a significant rising trend. Thus, the growth, development, and dry matter accumulation of peppers were enhanced by reducing Cd stress. Meanwhile, the application of exogenous Se significantly improved the accumulation of Se in seedlings. In addition, compared to Hongtianhu 101, the Yuefeng 750 cultivars had a greater Cd and Se enrichment capacity. The cultivation of Cd-excluding cultivars combined with exogenous Se addition can be used as a recommended solution to reduce Cd toxicity and achieve Cd reduction and Se enrichment in peppers under Cd pollution.
镉（Cd）的富集是威胁作物生长和食品安全的重要因素。然而，尚不清楚外源硒（Se）是否能同时实现降低镉含量并促进辣椒生长。本研究以粤丰750和红天湖101为材料，通过水培试验研究了不同硒 - 镉浓度（镉 = 2和5 μM；硒 = 0、0.5和2 μM）对辣椒幼苗镉和硒吸收转运、抗性生理以及生长发育的交互作用。施镉后辣椒幼苗器官镉含量显著增加，抑制其生长并加重其生理胁迫。然而，镉胁迫下施硒后辣椒的生长和光合能力得到促进。叶片中超氧阴离子（O）、过氧化氢（HO）、丙二醛（MDA）和脱落酸（ABA）含量以及吲哚 - 3 - 乙酸氧化酶（IAAO）活性呈显著逐渐下降趋势，而脯氨酸（Pro）、抗坏血酸（ASA）和反式玉米素核苷（ZR）含量呈显著上升趋势。因此，通过减轻镉胁迫增强了辣椒的生长、发育和干物质积累。同时，外源硒的施用显著提高了幼苗中硒的积累。此外，与红天湖101相比，粤丰750品种具有更强的镉和硒富集能力。在镉污染条件下，种植低镉积累品种并结合添加外源硒可作为减轻镉毒性、实现辣椒降镉富硒的推荐解决方案。
