Journal of Integrative Agriculture ›› 2024, Vol. 23 ›› Issue (1): 195-204.DOI: 10.1016/j.jia.2023.08.010

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镉在甜菜夜蛾体内组织分布及对其生殖的影响

  

  • 收稿日期:2023-02-16 接受日期:2023-07-12 出版日期:2024-01-20 发布日期:2024-01-06

Tissue distribution of cadmium and its effect on reproduction in Spodoptera exigua

Honghua Su1, Menglu Wu1, Yong Yang1, Yan Deng1, Yizhong Yang1#, Qingming Sun2#   

  1. 1 College of Plant Protection, Yangzhou University, Yangzhou 225009, China

    2 Institute of Fruit Tree Research, Guangdong Academy of Agricultural Sciences/Key Laboratory of South Subtropical Fruit Biology and Genetic Resource Utilization, Ministry of Agriculture and Rural Affairs/Guangdong Provincial Key Laboratory of Tropical and Subtropical Fruit Tree Research, Guangzhou 510640, China

  • Received:2023-02-16 Accepted:2023-07-12 Online:2024-01-20 Published:2024-01-06
  • About author:Honghua Su, E-mail: susugj@126.com; #Correspondence Yizhong Yang, Tel: +86-514-87979344, E-mail: yzyang@yzu.edu.cn; Qingming Sun, Tel: +86-20-38765390, E-mail: qingmingsun@126.com
  • Supported by:
    This study was partially supported by the Open Project Program from the Key Laboratory of South Subtropical Fruit Biology and Genetic Resource Utilization (Ministry of Agriculture and Rural Affairs), China (212103).

摘要:

蔬菜田极易受到重金属污染。甜菜夜蛾是主要的蔬菜害虫,主要通过取食受到重金属的胁迫。本文研究了镉胁迫下甜菜夜蛾不同组织中镉的积累及其对母代和子代生长发育的影响。在不同浓度(0.23.251.2 mg kg-1)镉的胁迫下,甜菜夜蛾各组织中镉含量与饲料中镉浓度相关。在幼虫阶段,三种镉处理中,中肠镉累积量最高,但成虫阶段,脂肪体中的镉含量最高;此外,卵巢中镉的含量显著高于精巢。甜菜夜蛾F1代分别取食不同浓度含镉饲料,而F2代均取食不含镉的人工饲料,在51.2 mg kg-1镉处理下,甜菜夜蛾F2代的幼虫存活率、化蛹率、羽化率和繁殖力较F1代均显著下降;3.2 mg kg-1处理后的F2代的繁殖力也明显低于亲代。在3.251.2 mg kg-1的镉胁迫下,仅雌虫受胁迫的繁殖力显著低于仅雄虫受胁迫的处理;母代在幼虫期受51.2 mg kg-1镉胁迫后,F2代的繁殖力显著低于F1代,同时显著低于3.20.2 mg kg-1处理下的繁殖力。该研究可作为不同重金属胁迫下的种群增长趋势预测的依据,也可为重金属污染环境风险评价提供有效参考。

Abstract:

Vegetable fields are often contaminated by heavy metals, and Spodoptera exigua is a major vegetable pest which is stressed by heavy metals mainly by feeding.  In this study, cadmium accumulation in the tissues of Sexigua exposed to cadmium and its effects on the growth and development of the parents and the offspring were investigated.  Under the stress of different concentrations of cadmium (0.2, 3.2, and 51.2 mg kg–1), the cadmium content in each tissue of Sexigua increased in a dose-dependent manner.  At the larval stage, the highest cadmium accumulation was found in midgut in all three cadmium treatments, but at the adult stage, the highest cadmium content was found in fat body.  In addition, the cadmium content in ovaries was much higher than in testes.  When F1 Sexigua was stressed by cadmium and the F2 generation was not fed a cadmium-containing diet, the larval survival, pupation rate, emergence rate and fecundity of the F2 generation were significantly reduced in the 51.2 mg kg–1 treatment compared to the corresponding F1 generation.  Even in the F2 generation of the 3.2 mg kg–1 treatment, the fecundity was significantly lower than in the parental generation.  The fecundity of the only-female stressed treatment was significantly lower than that of the only-male stressed treatment at the 3.2 and 51.2 mg kg–1 cadmium exposure levels.  When only mothers were stressed at the larval stage, the fecundity of the F2 generation was significantly lower than that of the F1 generation in the 51.2 mg kg–1 treatment, and it was also significantly lower than in the 3.2 and 0.2 mg kg–1 treatments.  The results of our study can provide useful information for forecasting the population increase trends under different heavy metal stress conditions and for the reliable environmental risk assessment of heavy metal pollution.


Key words: heavy metal pollution ,  cadmium, Spodoptera exigua ,  tissue distribution ,  reproduction