Inhibition Effects of Induced Resistance on Tobacco Resistance to Ralstonia solanacearum

doi:10.11924/j.issn.1000-6850.2014-0736

Abstract

Abstract: The objectives of this study were to investigate the inhibition effects of induced resistance on tobacco resistance to Ralstonia solanacearum. The effects of disease index, relative control effect, enzyme activities and content of water-soluble protein were studied after the tobacco leaves had been treated with salicylic acid (SA), riboflavin and oxalate acid, and inoculated with Ralstonia solanacearum the next day. The results showed that after leaf treated with the three induced-resistances, the activities of PAL, POD and PPO, the content of soluble protein were increased while CAT activities were inhibited in leaves. The three resistant inducers could induce the tobacco to produce resistance to Ralstonia solanacearum. At earlier stage (5 d), the riboflavin had the best induced resistance effects, the effective percentage was 55.71% , and there were no significant differences with SA. At mid-term (8 d), SA had the highest induced resistance effects, the effective percentage was 42.20% , and significantly higher than the other two. At later stage (11 d), SA had the best induced resistance effects; the effective percentage was 33.67%.

References

为了探明增苗节氮技术高产群体的适宜群体指标，在大田裂区试验下比较了3个氮肥水平[N₁：105 kg/hm²(节氮)、N₂：135 kg/hm²(节氮)、N₃：165 kg/hm²(常氮)]和3个抛秧密度[M₁：27万穴/hm²(常苗)、M₂：31.5万穴/hm²(增苗)、M₃：36万穴/hm²(增苗)]对‘湘早籼45号’抛秧群体质量及光合参数的影响。结果表明：在不影响产量的前提下，氮肥用量能比当前习惯施氮量减少18.2%，但进一步降低施氮量（减少36.4%）存在减产风险；氮肥、密度对作物生长率、净同化率、叶面积指数、叶面积衰减率、叶面积比率、表观转运率、光合势、粒叶比等群体指标均有一定影响，产量最高组合(N₂M₃)各项指标值位于中间范围内；N₂M₃的净光合速率、气孔导度、蒸腾速率、水分利用率也处于适中水平。综上所述：“增苗节氮”下早稻抛秧高产群体各项群体指标应该在适中范围内，实行合理搭配，以构建适宜群体来实现高产，而不是为了追求高产而盲目地增加氮肥用量，从而减少过度施用氮肥对生态环境所带来的危害。
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