Magnesium deficiency affects secondary lignification of the vascular system in Citrus sinensis seedlings

文献类型： 外文期刊

第一作者： Huang, Jing-Hao

作者： Huang, Jing-Hao;Xu, Jing;Ye, Xin;Li, Qiang;Chen, Li-Song;Huang, Jing-Hao;Fan, Guo-Cheng;Luo, Tu-Yan;Ren, Li-Hua;Qi, Yi-Ping;Ferrarezi, Rhuanito S.;Chen, Li-Song;Chen, Li-Song

作者机构：

关键词： Cell wall; Lignification; Root and leaf anatomy; Vascular cambium

期刊名称：TREES-STRUCTURE AND FUNCTION （ 影响因子：2.529； 五年影响因子：2.562 ）

ISSN： 0931-1890

年卷期： 2019 年 33 卷 1 期

页码：

收录情况： SCI

摘要： Key messageMg deficiency affected only the differentiation zone in Citrus sinensis roots. Phloem impairment in Mg-deficient leaves resulted in cell wall lignifications of both vascular cambium and spongy parenchyma cells. Decrease of Mg content in the roots hampered secondary lignification of endodermal and protoxylem cell walls.AbstractMagnesium (Mg) is a vital nutrient for plant photosynthesis and biochemical reactions. Mg deficiency is a widespread problem in citrus production, directly affecting yield and quality. With the objective of investigating the relationship among root and leaf anatomy, photosynthetic efficiency and mineral nutrient uptake and transport in Mg-deficient citrus, the effects of Mg deficiency in Xuegan' (Citrus sinensis) seedlings on plant biomass, leaf gas exchange and chlorophyll, nutrient contents, root and leaf anatomy and lignin biosynthesis were studied. Mg deficiency decreased root and shoot dry weight, leaf CO2 assimilation, chlorophyll and Mg, phosphorus (P), boron (B), cupper (Cu) and iron (Fe) concentration in roots, stems and leaves, and increased potassium (K) and calcium (Ca) concentration. Mg deficiency in the leaves resulted in phloem disorder that blocked phloem transport, leading to carbohydrate accumulation in chloroplasts and secondary lignifications of both vascular cambium and spongy parenchyma cell walls. In contrast, decrease of Mg content in the roots hampered lignin deposition on the protoxylem and endodermal cell walls at the root differentiation zone. Poorly lignified Casparian strip and xylem cell walls in Mg-deficient root tips might decrease xylem loading efficiency of nutrients, lowering their contents in the above ground parts, which ultimately inhibited whole plant growth.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序