Functional Role of Mucilage - Border Cells: A Complex Facilitating Protozoan Effects on Plant Growth
Functional Role of Mucilage - Border Cells: A Complex Facilitating Protozoan Effects on Plant Growth
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DOI：
10.1626/pps.11.344
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发表时间：
2008-01
影响因子：
2.5
通讯作者：
S. Somasundaram;M. Bonkowski;M. Iijima
中科院分区：
文献类型：
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作者：
S. Somasundaram;M. Bonkowski;M. Iijima
摘要在根际土壤中，粘液和根边界细胞(RBC)形成一个功能实体，即粘液边界细胞复合体(MB复合体)。MB复合体的碳水化合物由根际细菌利用，根际细菌处于土壤食物网的强大放牧压力下，特别是原生动物。我们研究了MB复合体对原生动物对植物生长的影响。首先，对属于不同生态型和亚种的16个水稻品种形成的MB复合体进行了量化。这些品种随后被用来研究原生动物对植物生长的影响。在完全水合胶浆和红细胞方面，最高和最低的MB复合体生产者之间的差异分别为3.1倍和5.3倍。粳稻的粘液产量与红细胞数呈显著正相关(R2=0.92)。原生动物的存在通常会增加地上部的生物量、侧根生长和植株的氮素吸收。此外，在原生动物存在的情况下，旱地品种的生长促进作用显著高于低地品种。MB复合体与阿米巴促进侧根生长之间的显著正相关表明，MB复合体促进了原生动物对植物生长的影响，这是MB复合体新的功能作用的第一个证据。
Abstract In rhizosphere soil, mucilage and root border cells (RBCs) form a functional entity, the mucilage border-cell complex (MB complex). Carbohydrates of the MB complex are utilized by rhizosphere bacteria, which are under strong grazing pressure of the soil food web, in particular protozoa. We investigated the role of the MB complex for protozoan effects on plant growth. First, the MB complex formed by 16 rice cultivars belonging to different ecotypes and subspecies were quantified. These cultivars were subsequently used to investigate protozoan effects on plant growth. The differences between the highest and lowest MB complex producers were 3.1 and 5.3 times for fully hydrated mucilage and RBCs, respectively. Mucilage production and RBCs showed a significant positive regression (R2 = 0.92) in Japonica. Presence of protozoa generally enhanced shoot biomass, lateral root growth and plant nitrogen uptake. Further, upland cultivars showed significantly higher growth enhancement than lowland cultivars in presence of protozoa. A significant positive regression between MB complex and increased lateral root growth by amoeba revealed that the MB complex facilitated protozoan effects on plant growth, which is the first evidence for a new functional role of the MB complex.