Community analysis of nodule-assoicated rhizosphere for revealing a mechanism of continuous cropping promlem in legumious plants

2014 Fiscal Year Final Research Report

• Project/Area Number: 22580074
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Plant nutrition/Soil science
• Research Institution: National Agriculture and Food Research Organization
• Principal Investigator: IKEDA Seishi 独立行政法人農業・食品産業技術総合研究機構, 北海道農業研究センター大規模畑作研究領域, 主任研究員 (20396609)
• Project Period (FY): 2010-04-01 – 2015-03-31
• Keywords: 根粒 / 連作障害 / マメ科 / 土壌微生物 / 根圏 / 細菌 / 糸状菌 / 線虫

Outline of Final Research Achievements

As a hypothesis, the nodules biomass in a field was considered as a main factor for causing problems in continuous cropping of leguminous plants. After continuous cropping of three different nodulation phenotypes of soybeans (non-nodule, super-nodule, and wild type soybeans) on the same fields for three years, kidney beans were cultivated on those field as a succeeding crop. The community analysis of rhizosphere soils of these kidney beans revealed that the populations of nematode had no correlation to the nodule biomass in a preceding crop. However, the community structure of non-nodulated soybean mutant was shown to be similar to that of kidney beans which had been continuously cropping for four years. In addition, the community analysis clarified that the relative abundance of Mortierella elongate was increased in the rhizosphere of kidney beans as responding to the nodule biomass of preceding crops.

Free Research Field

植物共生科学、農業微生物学、分子微生物生態学