Hokkaido University · 농업·생명과학
Chikae Tatsumi 교수의 연구실은 산림 생태계에서 근본적인 역할을 하는 균류-식물 상호작용, 특히 균근균과 식물 간의 공생 관계가 토양 탄소 저장 및 영양소 순환에 미치는 영향을 중심으로 연구합니다. 주로 엑토마이코르라이자(ectomycorrhizal, ECM) 및 아르부스큘라 마이코르라이자(AM) 균류의 생태적 역할과 도시화, 산림 분할 등 환경 변화가 이 상호작용에 미치는 영향을 다룹니다. 특히 도시화가 균근균의 식물 뿌리 침투율과 토양 미생물망의 연결성에 악영향을 미치는지를 중심으로 실험적·관측적 접근을 결합한 연구를 수행하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Mycorrhizal fungi have considerable effects on soil carbon (C) storage, as they control the decomposition of soil organic matter (SOM), by modifying the amount of soil nitrogen (N) available for free-living microbes. Through their access to organic N, ectomycorrhizal (ECM) fungi compete with free-living soil microbes; this competition is thought to slow down SOM decomposition. However, arbuscular mycorrhizal (AM) fungi cannot decompose SOM, and therefore must wait for N to first be processed by
Temperate forests are threatened by urbanization and fragmentation, with over 20% (118,300 km<sup>2</sup>) of U.S. forest land projected to be subsumed by urban land development. We leveraged a unique, well-characterized urban-to-rural and forest edge-to-interior gradient to identify the combined impact of these two land use changes-urbanization and forest edge creation-on the soil microbial community in native remnant forests. We found evidence of mutualism breakdown between trees and their fun
Thermolysin is remarkably activated and stabilized by neutral salts with varying degrees depending on salt species, and particular surface residues are thought to be especially important in its activity and stability [Inouye, K. (1992) J. Biochem. 112, 335-340; Inouye, K. et al. (1998) Biochim. Biophys. Acta 1388, 209-214]. In this study, we examined the mutational effects of the surface residues of thermolysin. Gln128 and Gln225 were selected as the residues to be mutated because they are locat
Nitrogen (N) is an essential plant nutrient, and plants can take up N from several sources, including via mycorrhizal fungal associations. The N uptake patterns of understory plants may vary beneath different types of overstory trees, especially through the difference in their type of mycorrhizal association (arbuscular mycorrhizal, AM; or ectomycorrhizal, ECM), because soil mycorrhizal community and N availability differ beneath AM (non-ECM) and ECM overstory trees (e.g., relatively low nitrate
Abstract Temperate forests are particularly threatened by urbanization and fragmentation, with over 20% (120lJ000 km 2 ) of recently urbanized land in the U.S. subsuming natural forests. We leveraged a unique, well-characterized urban-to-rural and forest edge-to-interior gradient to identify the combined impact of these two land use changes - urbanization and forest fragmentation - on soil microbial community in native, remnant forests. We found evidence of mutualism breakdown between trees and
Native tree species are frequently unable to effectively grow in non-native tree cultivation scenarios. In the Loess Plateau, China, it is difficult to find native oak (Quercus liaotungensis) seedlings in non-native black locust forests. Black locust is an arbuscular mycorrhizal (AM) tree, but oak is an ectomycorrhizal (ECM) tree. Plants highly depend on their symbiotic mycorrhizal fungi to take up water, nitrogen (N) and other nutrients. We hypothesized that black locust forests would not provi
