铁营养逆境对辣椒根系形态及生理特性的影响
徐明睿 , 王晓娟 , 杨亚莉 , 马越飞 , 刘万茂 , 孙颖
农业科学研究(中英文) ›› 2026, Vol. 47 ›› Issue (01) : 74 -82.
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
为了研究不同浓度铁胁迫对辣椒(Capsicum annuum)幼苗叶片及根系表型变化和生理特性的影响,以纯系辣椒品种CA#8为材料,进行生理试验。使用霍格兰营养液培养,共设置4 种铁浓度梯度处理:对照组(CK,25 μmol·L-1 EDTA-Fe2+)、缺铁胁迫组(D,0 μmol·L-1 EDTA-Fe2+)、低铁胁迫组(L,5 μmol·L-1 EDTA-Fe2+)和高铁胁迫组(H,150 μmol·L-1 EDTA-Fe2+)。结果表明:在不同浓度铁胁迫处理后,辣椒幼苗的叶片和根系表型均发生变化。缺铁和低铁胁迫下,叶片呈现黄绿色,高铁胁迫下,叶片褶皱变白;各胁迫组幼苗根系的根总数、根总长和根总面积均减少。此外,缺铁处理后根际酸化程度最高,根系铁还原酶活性明显增强;各胁迫组根系的超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性随着处理时间的推移均呈先上升后下降的趋势。在前期的转录组数据中筛选出与铁转运相关的关键响应基因,如CaFRO2、CaIRT1、CaYSL7。在低铁胁迫下,CaFRO2、CaIRT1、CaYSL7均为上调基因,通过实时荧光定量(qRT-PCR)验证上述基因表达数据的准确性。因此,在铁营养逆境下,辣椒幼苗的根系形态学发生变化,并通过生理分子机制的调控来适应铁胁迫并增强对铁胁迫的耐受性。
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.
| [1] |
郭佩瑶,刘美玲,曾玉华.设施土壤连作障碍及其防控措施研究进展[J].西北园艺(果树),2023(1):1-5. |
| [2] |
郭红伟,郭世荣,刘来, |
| [3] |
|
| [4] |
佚名.辣椒小麦套种促增收[J].农村新技术,2023(8):51. |
| [5] |
黄恒毅.闽南沿海地区大棚“水稻—辣椒”轮作模式及效益分析[J].辣椒杂志,2023,21(4):20-24. |
| [6] |
张俊霞,刘晓鹏,向极钎.植物抗氧化系统对逆境胁迫的动态响应[J].湖北民族学院学报(自然科学版),2015,33(4):435-439. |
| [7] |
张妮娜,上官周平,陈娟.植物应答缺铁胁迫的分子生理机制及其调控[J].植物营养与肥料学报,2018,24(5):1365-1377. |
| [8] |
王晓立,韩浩章,纪思雨.植物黄化原因及对光合特性的影响综述[J].安徽农学通报(上半月刊),2011,17(17):51-52. |
| [9] |
姚明华,尹延旭,王飞, |
| [10] |
吴永红,周书栋,李雪峰, |
| [11] |
李丽娅.铁(Ⅲ)螯合物还原酶在植物铁代谢中的作用研究[D].哈尔滨:哈尔滨师范大学,2011. |
| [12] |
付豪,任云,陈泽雄, |
| [13] |
刘鑫,李扬眉,贾梦晗, |
| [14] |
胡亚.缺铁胁迫下苹果砧木垂丝海棠幼苗的生理特性和转录组学分析[D].兰州:甘肃农业大学,2018. |
| [15] |
金昕.杜梨对缺铁胁迫的生理及分子响应机制研究[D].南京:南京农业大学,2017. |
| [16] |
王金龙,王薇薇,万平, |
| [17] |
闫国超,樊小平,谭礼, |
| [18] |
杨生龙.水稻早衰叶ES2和温敏型白绿叶WGL5基因克隆与功能分析[D].沈阳:沈阳农业大学,2021. |
| [19] |
|
| [20] |
李玥,赖勇林,王军, |
| [21] |
曾秀成,王文明,罗敏娜, |
| [22] |
乔海涛,杨洪强,申为宝, |
| [23] |
殷文娟,吴玉霞,何天明, |
| [24] |
胡盛沪,黎晓峰,兰柳艳, |
| [25] |
|
| [26] |
刘娅惠,徐瑾,雷蕾, |
| [27] |
|
| [28] |
刘元峰,李素贞,郭晋杰, |
| [29] |
刘丽丽,孔谨,许雪峰, |
宁夏重点研发计划项目(引才专项)(2021BEB04079)
宁夏自然科学基金项目(2022AAC03089)
/
| 〈 |
|
〉 |