We investigated the effect of CO2 enrichment and initial inoculum density on competition between Skeletonema costatum and Heterosigma akashiwo,two common algae seen in algal blooms.The initial inoculum density(0.2...We investigated the effect of CO2 enrichment and initial inoculum density on competition between Skeletonema costatum and Heterosigma akashiwo,two common algae seen in algal blooms.The initial inoculum density(0.2×104,0.4×104,0.8×104 cells/ml) had a significant effect on population growth and competition between H.akashiwo and S.costatum.The time required for population growth to reach the exponential growth phase and stationary phase decreased significantly as the initial density increased.When the two species were cultured together,S.costatum tended to outcompete H.akashiwo,especially when present at higher initial ratios.CO_2 enrichment(5 000μl/L CO_2) increased the maximum population density and carrying capacity of H.akashiwo but decreased these measures for S.costatum.Thus,CO_2 enrichment favored the growth of H.akashiwo over S.costatum.展开更多
Optimal charcoal concentrations were examined for tuff formation of SBIs （single-basidiospore isolates） obtained from Rhizoctonia solani AG-1 IC, AG-2-2 IV and AG-2-3, and SPIs （single-protoplast isolates） from AG...Optimal charcoal concentrations were examined for tuff formation of SBIs （single-basidiospore isolates） obtained from Rhizoctonia solani AG-1 IC, AG-2-2 IV and AG-2-3, and SPIs （single-protoplast isolates） from AG-1 IA by using PDCA with different charcoal concentrations. The best charcoal concentration for SBIs from AG-1 IC was 0.5%, from AG-2-3 was 1%, and from AG-2-2 IV was 2%. The optimal concentration was 0% for SPIs from AG-1 IA. The optimal charcoal concentrations used for tuff formation between SBIs and between SPIs are quite varied, depending on the different AGs. The results of AFLP haplotypes suggest that tuff isolates formed between SBIs/SPIs are heterokaryon.展开更多
基金Supported by the Specialized Research Program for Marine Public Welfare Industry,SOA(No.200805066)
文摘We investigated the effect of CO2 enrichment and initial inoculum density on competition between Skeletonema costatum and Heterosigma akashiwo,two common algae seen in algal blooms.The initial inoculum density(0.2×104,0.4×104,0.8×104 cells/ml) had a significant effect on population growth and competition between H.akashiwo and S.costatum.The time required for population growth to reach the exponential growth phase and stationary phase decreased significantly as the initial density increased.When the two species were cultured together,S.costatum tended to outcompete H.akashiwo,especially when present at higher initial ratios.CO_2 enrichment(5 000μl/L CO_2) increased the maximum population density and carrying capacity of H.akashiwo but decreased these measures for S.costatum.Thus,CO_2 enrichment favored the growth of H.akashiwo over S.costatum.
文摘Optimal charcoal concentrations were examined for tuff formation of SBIs （single-basidiospore isolates） obtained from Rhizoctonia solani AG-1 IC, AG-2-2 IV and AG-2-3, and SPIs （single-protoplast isolates） from AG-1 IA by using PDCA with different charcoal concentrations. The best charcoal concentration for SBIs from AG-1 IC was 0.5%, from AG-2-3 was 1%, and from AG-2-2 IV was 2%. The optimal concentration was 0% for SPIs from AG-1 IA. The optimal charcoal concentrations used for tuff formation between SBIs and between SPIs are quite varied, depending on the different AGs. The results of AFLP haplotypes suggest that tuff isolates formed between SBIs/SPIs are heterokaryon.
