%0 Journal Article
%T Effects of Ca2+ on acid tolerance of Medicago sativa and Rhizobium meliloti<br>钙离子对紫花苜蓿及苜蓿根瘤菌耐酸能力的影响
%A ZHANG Qin
%A ZHANG Lei
%A WEI Shi-qing
%A LI Yan-bin
%A ZHANG Chao
%A <br>张琴
%A 张磊
%A 魏世清
%A 李艳宾
%A 张超
%J 应用生态学报
%D 2007
%I 
%X Soil acidity is an important environmental factor hampering the effective symbiotic nitrogen fixation of Rhizobium meliloti and its host plant Medicag sativa. The study on the effects of Ca2 + on the acid tolerance of M. sativa and R. meliloti showed that applying 5 and 10 mmol . L(-1) of Ca2+ could promote the growth of R. meliloti and advance its log growth phase. Under neutral pH condition, applying Ca2+ didn't have any significant effects on root hair deformation, while under low pH condition, Ca2+ demonstrated positive functions. The higher the Ca2+ concentration, the more significantly it affected, indicating that Ca2+ might play an important role in the recognition between R. meliloti and its host plant. Applying Ca2+ under low pH made the nodulation ahead of time and the nodulation rate enhanced. Definite concentration of Ca2+ could increase the number of nodules in the same period, which was more obvious at anaphase stage or under lower pH condition.
%K Medicago sativa
%K Rhizobium meliloti
%K acid tolerance
%K nodulation
%K root hair deformation<br>紫花苜蓿
%K 苜蓿根瘤菌
%K 耐酸
%K 结瘤
%K 根毛变形
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=1D09BBDB9345D533&yid=A732AF04DDA03BB3&vid=13553B2D12F347E8&iid=B31275AF3241DB2D&sid=328E221C70C13B92&eid=83BD01456E8187CE&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=0&reference_num=19