CAJ | 학술논문

为探究土壤水分对烟草孢囊线虫(Heterodera glycines)侵染的影响及其机制,2014年6—9月采用3种不同水分处理的盆栽试验,定期取样测定土壤和根系中线虫数量及根系和叶片中烟碱含量.结果表明,常规浇水处理下烟草孢囊线虫明显发生3代,繁殖系数(Rf=Pf/Pi)高达2.7;烟草根系中烟碱含量均低于1.00%.8月过度浇水处理下孢囊线虫第3代发生不明显且向后推迟,Rf为0.5;根系中最高烟碱含量(1.92%)发生在过度浇水15 d后.7—8月过度浇水处理下孢囊线虫第3代发生不明显,且第2代和第3代均向后推迟,Rf仅为0.1;根系中最高烟碱含量(3.22%)发生在过度浇水35 d后.常规浇水处理下,烟草叶片中烟碱含量总体呈上升趋势,而过度浇水处理下叶片中烟碱含量下降.过度浇水明显抑制烟草孢囊线虫的侵染,且与烟草根系中烟碱的大量积累可能存在相关性.
위탐구토양수분대연초포낭선충(Heterodera glycines)침염적영향급기궤제,2014년6—9월채용3충불동수분처리적분재시험,정기취양측정토양화근계중선충수량급근계화협편중연감함량.결과표명,상규요수처리하연초포낭선충명현발생3대,번식계수(Rf=Pf/Pi)고체2.7;연초근계중연감함량균저우1.00%.8월과도요수처리하포낭선충제3대발생불명현차향후추지,Rf위0.5;근계중최고연감함량(1.92%)발생재과도요수15 d후.7—8월과도요수처리하포낭선충제3대발생불명현,차제2대화제3대균향후추지,Rf부위0.1;근계중최고연감함량(3.22%)발생재과도요수35 d후.상규요수처리하,연초협편중연감함량총체정상승추세,이과도요수처리하협편중연감함량하강.과도요수명현억제연초포낭선충적침염,차여연초근계중연감적대량적루가능존재상관성.
In order to explore the effect of soil water content on the infection of tobacco cyst nematode (Heterodera glycines) and the possible mechanism, pot experiments with three water treatments were carried out from June to September of 2014, the number of different-staged nematodes in soil and root and the nicotine content of tobacco leaf and root were determined. The results showed that, under normal water treatment, cyst nematode obviously occurred 3 generations, with a high reproduction factor (Rf=Pf/Pi) of 2.7, and the nicotine content in tobacco roots was lower than 1.00%. In the overwatering treatment in August, the third generation of cyst nematode barely occurred and was retarded, with the Rf of 0.5, and nicotine content in tobacco roots reached the maximum (1.92%) 15 d after the overwatering treatment. In the overwatering treatment in July and August, the third generation of cyst nematode barely occurred and both the second generation and the third one were retarded, with a small Rf of 0.1, and the maximum nicotine content (3.22%) in tobacco roots was reached 35 d after the overwatering treatment. The nicotine content of tobacco leaf showed an overall rising trend under normal water treatment and decreased in both overwatering treatments. Overwatering obviously inhibited the infection of tobacco cyst nematode, which was somehow correlated with the accumulation of nicotine in tobacco roots.