Acta Horticulturae Sinica ›› 2022, Vol. 49 ›› Issue (5): 973-983.doi: 10.16420/j.issn.0513-353x.2021-0197

• Research Papers • Previous Articles     Next Articles

Magnesium Deficiency Altered in Iron Absorption,Subcellular Distribution,and Chemical Forms in Citrus Seedlings

JIA Yamin1, XU Hao1, HU Wenlang1, WANG Yuwen1,2, YE Xin1, CHEN Lisong1, LI Yan1, GUO Jiuxin1,2,*()   

  1. 1Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation,College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou 350002,China
    2International Magnesium Institute,College of Resources and Environment,Agriculture and Forestry University,Fuzhou 350002,China
  • Received:2021-11-23 Revised:2022-01-12 Online:2022-05-25 Published:2022-05-25
  • Contact: GUO Jiuxin


Citrus is mainly grown in acid red soil region of southern China,which has Mg deficiency and rich in Fe. The aim of this study was to reveal the effects of Mg deficiency on Fe absorption,subcellular distribution,and chemical forms in citrus seedlings. Citrus sinensis‘Xuegan’sand cultured in greenhouse was used as experimental materials,which was treated with Mg sufficiency(2 mmol · L-1 Mg2+)and Mg deficiency(0 mmol · L-1 Mg2+). After 11 months,the plant samples were collected to determine the biomass and Fe content,measure the Fe subcellular fractions and chemical forms,and calculate the Fe accumulation and distribution in different organs of citrus seedlings. Compared with Mg sufficiency treatment,the biomass of citrus plants was decreased by 40.32% under Mg deficiency treatment,which was decreased by 34.90%,39.61%,and 47.17% in leaf,stem and root,respectively. Mg deficiency treatment significantly increased Fe content in different organs,in which leaf,stem,and root increased by 25.32%,31.06%,and 53.94%,respectively. Also,Fe mainly accumulated in the root between treatments,which the proportion was more than 75%. Mg deficiency treatment significantly increased Fe content in different subcellular fractions,and it showed a general trend which was cell wall > organelle > soluble fraction between treatments,and the proportion of Fe content in the cell wall was more than 55% in branch leaves,upper leaves,lower leaves,and root tips. Moreover,Mg deficiency treatment not only significantly increased Fe content in various chemical forms in root tips,but also increased it in the phosphoric acid and oxalic acid forms and decreased it in the water-soluble form in leaf organs. However,the Fe mainly exists in the phosphoric acid and oxalic acid forms in different organs between treatments,which accounted for nearly 50%.

Key words: citrus, seedlings, Mg deficiency, biomass, Fe content, subcellular distribution, chemical forms

CLC Number: