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根瘤 (根瘤菌vs宿主plant (get N (in soil (NO3-(硝酸鹽), NH4+(銨鹽)), plant can't…
根瘤
根瘤菌vs宿主plant
relation
互利共生
get N
plant can't absorb&use N2
in soil
NO3-(硝酸鹽)
NH4+(銨鹽)
plant body
provide
有機養分.O2
根瘤菌
conduct固氮作用in plant cell
氮氣－(還原)→銨鹽
plant absorb&use
definition
根瘤菌
kind of 固氮細菌
根瘤菌侵入豆科plant皮層cell
cell內大量繁殖
form
bulging根瘤
improve皮層cell&周鞘cell conduct cell division
reaction formula
N2－
固氮酶
→NH3－dissolve in H2O→NH4+