农业科学研究2026，Vol.47Issue(1)：74-82,9.DOI:10.13907/j.cnki.nykxyj.20250427.001
铁营养逆境对辣椒根系形态及生理特性的影响
Effects of iron nutritional stress on the morphological and physiological characteristics of pepper roots
摘要
Abstract
To examine how iron availability affects leaf and root phenotypes and root physiological traits in pepper,this study used the inbred line CA#8 grown hydroponically in Hoagland nutrient solution under four iron regimes:control(CK,25 μmol·L-1 EDTA-Fe2+),iron deprivation(D,0 μmol·L-1 EDTA-Fe2+),low iron(L,5 μmol·L-1 EDTA-Fe2+),and high iron(H,150 μmol·L-1 EDTA-Fe2+).Iron stress at different concentrations induced pronounced changes in seedling leaves and roots.Under iron deficiency and low iron,leaves became yellowgreen(chlorotic),whereas under high iron they became wrinkled and whitened.Across all stress treatments,total root number,total length,and total surface area were significantly reduced.Iron deprivation caused the strongest rhizosphere acidification and markedly increased root ferricchelate reductase activity.In all stress groups,root activities of superoxide dismutase(SOD),peroxidase(POD),and catalase(CAT)increased initially and then decreased with prolonged treatment.From prior transcriptome data,we screened key iron transportrelated responsive genes(CaFRO2,CaIRT1,and CaYSL7).These genes were upregulated under low iron stress,and their expression patterns were validated by quantitative realtime PCR(qRTPCR).Overall,iron nutritional stress reshapes root morphology,and pepper seedlings adapt via physiological and molecular regulation to enhance tolerance to iron stress.关键词
辣椒/铁胁迫/根型/转录组Key words
Capsicum annuum/iron stress/root morphology/transcriptome分类
农业科技引用本文复制引用
徐明睿,王晓娟,杨亚莉,马越飞,刘万茂,孙颖..铁营养逆境对辣椒根系形态及生理特性的影响[J].农业科学研究,2026,47(1):74-82,9.基金项目
宁夏重点研发计划项目(引才专项)(2021BEB04079) （引才专项）
宁夏自然科学基金项目(2022AAC03089) （2022AAC03089）
