权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Functional role of mucilage-root border cells complex in the interface between plant root and soil

粘液根边界细胞复合物在植物根与土壤界面中的功能作用

基本信息

批准号：
15380014
负责人：
IIJIMA Morio
金额：
$ 6.98万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15380014/
关键词：
Root border cells Protozoa International research collaboration Plant root cap Soil mechanical impedance Mucilage exudation United Kingdom Germany 土壌の機械的抵抗国際情報交換成長圧脱落細胞トウモロコシ

项目摘要

In rhizosphere soil, mucilage and root border cells form a functional entity, the mucilage-border cells complex (MB complex). Firstly, the longevity of the released border cells into real soil was analyzed. Many of the border cells present in the rhizosphere soil for relatively longer duration at least more than 10 days. The longevity would depend on the origin of border cells; i.e., root cap layers when the cells are sloughed off. The cells from the inner layer would stay longer in soil due to its younger stage of the cell maturity. The MB complex is utilized by rhizosphere bacteria, which in turn are under strong grazing pressure of the soil food web, in particular protozoa. Next, we investigated the role of MB complex on the protozoan positive effects for plant growth. Weight of fully hydrated MB complex of 27 rice cultivars was firstly quantified. Secondly, 16 cultivars with different levels of MB complex production were selected for root border cells (RBC) enumeration. The weight of MB complex varied among the cultivars and some of the higher MB complex producing cultivars also produced higher number of RBC. Generally speaking, presence of protozoa enhanced lateral root growth and carbon ＆ nitrogen uptake. Further, upland cultivars responded well to amoebal effects as compared with the lowland cultivars. Positive correlation between MB complex production and increased lateral root growth by amoeba revealed that MB complex have a functional role of facilitating a symbiotic relationship with amoeba, which is the first evidence of the new role of MB complex.

在根际土壤中，粘液和根边缘细胞形成一个功能实体，即粘液边缘细胞复合体（MB复合体）。首先，分析了释放到真实的土壤中的边缘细胞的寿命。许多边缘细胞在根际土壤中存在的时间相对较长，至少超过10天。寿命将取决于边缘细胞的起源;即，细胞脱落时形成根冠层。内层的细胞由于其成熟阶段较年轻，在土壤中停留的时间较长。MB复合物被根际细菌利用，而根际细菌又受到土壤食物网（特别是原生动物）的强大放牧压力。接下来，我们研究了MB复合物对原生动物对植物生长的积极影响的作用。首次定量测定了27个水稻品种全水合MB复合物的重量。其次，选择16个MB复合物产生水平不同的品种进行根边缘细胞（RBC）计数。MB复合物的重量因品种而异，一些MB复合物产量较高的品种也产生较高的RBC数量。一般来说，原生动物的存在促进了侧根的生长和碳氮的吸收。此外，与低地品种相比，高地品种对变形虫的影响反应良好。MB复合物的产生与阿米巴侧根生长的增加呈正相关，揭示了MB复合物具有促进与阿米巴共生关系的功能作用，这是MB复合物新作用的第一个证据。