八种豆科树种根瘤的形态与结构研究

对8种豆科树种根瘤的形态和结构进行观察，结果显示:根瘤形态多样，分有限根瘤和无限根瘤两类，根瘤形状、大小与根瘤类型之间有一定的相关性。豆科树种根瘤具有豆科植物根瘤的基本结构，即从外向内依次为皮层、维管束和含菌细胞区，但在皮层中发现有特殊的根瘤形成层细胞，可能与根瘤增粗及根瘤维管束的分化形成有关。豆科树种根瘤中维管束粗而发达，并具有木本植物根的中柱结构，包括有典型的环纹导管、筛管、纤维细胞等。

The research on the morphology and structure of root nodules in eight legume species

The morphology and structure of root nodules in 8 legume species were observed. The result showed the root nodule of 8 legume species were in various shapes, and they were divided into finite nodule and infinite nodule. The shape and size of nodule were correlated with nodule types. Legume species had the same nodule structure to the legume crops, which was cortex, vascular bundle and bacteriocyte area. But some special nodule cambial cells were found in cortex, which was related to the nodule cassation and differentiation of vascular bundle to some extend. The vascular bundle of legume species were well developed and there was stele structure including ringed vessel , sieve tube and fiber cell in the nodule under investigation.