Volume 30 Issue 5
Sep.  2013
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ZHANG Xin, SHEN Aihua, LIN Yongjing, WANG Qiuqin, LIN Haiping. Infection and nodulation with Casuarina equisetifolia-Frankia symbiosis[J]. Journal of Zhejiang A&F University, 2013, 30(5): 669-673. doi: 10.11833/j.issn.2095-0756.2013.05.006
Citation: ZHANG Xin, SHEN Aihua, LIN Yongjing, WANG Qiuqin, LIN Haiping. Infection and nodulation with Casuarina equisetifolia-Frankia symbiosis[J]. Journal of Zhejiang A&F University, 2013, 30(5): 669-673. doi: 10.11833/j.issn.2095-0756.2013.05.006

Infection and nodulation with Casuarina equisetifolia-Frankia symbiosis

doi: 10.11833/j.issn.2095-0756.2013.05.006
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  • Corresponding author: ZHANG Xin
  • Received Date: 2012-10-30
  • Rev Recd Date: 2013-01-14
  • Publish Date: 2013-10-20
通讯作者: 陈斌, bchen63@163.com
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Infection and nodulation with Casuarina equisetifolia-Frankia symbiosis

doi: 10.11833/j.issn.2095-0756.2013.05.006
    Corresponding author: ZHANG Xin

Abstract: Symbiotic nitrogen-fixing Frankia strains are well known to promote the growth of Casuarina trees in coastal area. The studies on their infection process are very important to utilize them as bioagents. The infection process of two symbiotic Frankia strains,isolated from the root nodules of Casuarina equisetifolia in Zhejiang Province,was studied using parallel semi-thin and ultra-thin sections that were periodically analyzed with light and electron microscopy. Results showed that Frankia penetrated root hair cells and infection proceeded intracellularly in the root cortex. This stimulated infected cells which started producing abundant irregular dense electron deposits. Frankia,packaged by deposits,infected continuously,forming infection threadsthat penetrated adjacent cortex cells and ultimately approached nodules. Chronologically, nodule development began when Frankia infected root hair cells 6 d after inoculation. At 12 d,after being activated by endogenous hormones,pericycle cells underwent vigorous mitosis giving rise to lobe primordium. At 15 d,when a portion of parenchyma cells were infected by Frankia,the primordium transformed into pre-nodules. Finally,24 d following inoculation,after forming of the apophysis from the cortex,pre-nodules developed into new nodules and finally mature nodules. Thus,Frankia infection process consisted of the following processes:Frankia infection-infection thread-formation ofinterfacial matrix-penetration of cell wall-propagation-vesicles development-spores producing;and the development process for the nodule was primordium-pre-nodule-mature nodule.[Ch,9 fig. 20 ref.]

ZHANG Xin, SHEN Aihua, LIN Yongjing, WANG Qiuqin, LIN Haiping. Infection and nodulation with Casuarina equisetifolia-Frankia symbiosis[J]. Journal of Zhejiang A&F University, 2013, 30(5): 669-673. doi: 10.11833/j.issn.2095-0756.2013.05.006
Citation: ZHANG Xin, SHEN Aihua, LIN Yongjing, WANG Qiuqin, LIN Haiping. Infection and nodulation with Casuarina equisetifolia-Frankia symbiosis[J]. Journal of Zhejiang A&F University, 2013, 30(5): 669-673. doi: 10.11833/j.issn.2095-0756.2013.05.006

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