摘要
在野外对日本菟丝子(Cuscutajaponica)选择寄主的行为进行观察,结果表明,在所研究的植物群落中,日本菟丝子在不同寄主上发生缠绕的数量多少、发生吸器时间的先后和缠绕比率的大小顺序为枸树、蟛蜞菊、五爪金龙和马缨丹,而从缠绕发生至吸器发生期间日本菟丝子生长点伸长量的大小顺序则相反,且差异显著.日本菟丝子生长点在与聚氯乙烯塑料(PVC)棒接触后24h内发生明显的偏离,而在接触不同寄主后12h内则发生左旋3圈缠绕.多寄主共存的群落比单一寄主群落对日本菟丝子及其寄主的生存均有利.日本菟丝子选择寄主的行为与不同寄主N的含量关系不明显,推测这种选择行为与不同寄主次生物质的差异有关.
A field investigation on the selection behavior of Cuscuta japonica on their hosts showed that among the test plant communities,the number of coiling,the time of haustorium occurring,and the rate of coiling of C.japonica on hosts followed the order of B.papyrifera,W.chinensis,I.cairica,and L.camara; but the length of the elongation of C.japonica growing tips from coiling to haustorium occurring was with the order of L.camara,I.cairica,W.chinensis,and B.papyrifera.Furthermore,the growing tips of C.japonica coiled 3 circles in left direction on all selected hosts in 12 hrs,but grew away after contacting PVC rods within 24 hrs.The host diversity of C.japonic was beneficial to the survival of both C.japonica and its hosts.The selection behavior of C.japonica on their hosts had no correlation with the total N contents of different hosts.It could be postulated that the secondary metabolites of hosts made a contribution to the selection behavior of C.japonica on their hosts.
出处
《应用生态学报》
CAS
CSCD
北大核心
2005年第2期323-327,共5页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(30170182
30470192)
国家"十五"科技重点攻关计划资助项目(2001BA509B07).
关键词
日本菟丝子
寄生
选择行为
寄主N含量
次生物质
Cuscuta japonica, Parasitism, N content of hosts, Selection behavior, Secondary metabolites.
