PGPB对红树植物木榄幼苗的接种效应
Effects of Inoculation with Plant Growth-promoting Bacteria on Bruguiera gymnorrhiza Seedlings
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摘要: 通过盆栽试验研究了植物促生菌(PGPB)对红树植物木榄幼苗的接种效应,供试菌为6种解磷菌(即B．amy, Vib,B．atr,Xan,B．Lic,P．M．)和5种固氮菌(即Au4,Phy,24S,JA4,cd),结果表明:(1)分别接种6种解磷菌株6个月后木榄幼苗的生长均得到了不同程度的促进,与对照相比,木榄苗高增加21．57％-9．54％,生物量增加27．49％ -20．32％,叶片的氮含量增加33．33％-1．35％,叶片的磷含量增加24．42％-2．04％;经差异显著性检验,B．amy 和Vib 2个菌种对木榄幼苗的促生效应比其它解磷菌株更明显;(2)分别接种5种固氮菌株6个月后木榄幼苗的生长均得到了促进,与对照相比,木榄幼苗的均高增加24．07％-10．22％,生物量增加32．36％-19．71％,叶片的氮含量增加23．39％-4．05％,叶片的磷含量增加32．79％-4．99％;差异显著性检验表明:Au4和Phy 2个菌种对木榄幼苗的促生效果比其它固氮菌更显著。Abstract: A pot experiment was conducted to investigate the growth-promoting effects of inoculation with plant growth-promoting bacteria on Bruguiera gymnorrhiza seedlings, including six phosphate solubilizing bacterial strains (i. e. B. amy, Vib,B. atr,Xan,B. Lie,P. M.) and five nitrogen-fixing bacterial strains (i. e. Au4,Phy ,24S,JA4,cd) . Results showed that: (1) After inoculated with the PSB for six months, the growth of the B. gymnorrhiza seedlings was accelerated significantly. The average height of B. gymnorrhiza seedlings was increased by 21. 57%-9. 54% compared to those of controls, and the biomass was accordingly increased by 27. 49%-20. 32% . The total N and P contents of inoculated seedling leaves were 33.33%-1.35% and 24.42%-2.04% respectively higher than those of controls; (2)The test of significance of difference also indicated that the growth-promoting effects of B. amy and Vib were significantly higher than those of other PSBs; (3) Six months after the inoculation of nitrogen-fixing bacterial strains, the average height of B. gymnorrhiza seedlings were increased by 24.07%-10.22% , and the biomass was accordingly increased by 32.36%-19.71% . The total N and P contents of inoculated seedling leaves were 23. 39%-4.05% and 32. 79%-4. 99% respectively higher than those of controls; (4) The test of significance of difference also indicated that the growth-promoting effects of Au4 and Phy were significantly higher than those of other nitrogen-fixing bacterial strains.
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