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In the absence of P23, the increases in frond number and biomass production of L. minor were significantly lower (P < 0.05) in non-sterile pond water than in sterile pond water (Figure 6, Table 2). This result indicates that indigenous microorganisms in the pond water inhibited the growth of L. minor.
Table 2

Effects of P23 on the growth of L. minor in sterile or non-sterile pond water

Pond waterTreatmentIncrease in number of fronds per flask during 15 daysa (and ratio of P23 to control)Biomass production (increase in dry weight; mg) of plants per flask during 15 daysa (and ratio of P23 to control)
Sterile P23 38 ± 6.8 (1.3)* 22.6 ± 2.5 (1.9)* 
Control 30 ± 4.5 12.0 ± 0.2 
Non-sterile P23 42 ± 3.0 (3.8)* 18.2 ± 1.2 (2.4)* 
Control 11 ± 1.07 7.7 ± 1.0 
Pond waterTreatmentIncrease in number of fronds per flask during 15 daysa (and ratio of P23 to control)Biomass production (increase in dry weight; mg) of plants per flask during 15 daysa (and ratio of P23 to control)
Sterile P23 38 ± 6.8 (1.3)* 22.6 ± 2.5 (1.9)* 
Control 30 ± 4.5 12.0 ± 0.2 
Non-sterile P23 42 ± 3.0 (3.8)* 18.2 ± 1.2 (2.4)* 
Control 11 ± 1.07 7.7 ± 1.0 

Values are means ± SD. Values in parentheses are the ratio of the P23 value to the control (no P23) value.

aFinal value minus initial value.

*Significant difference (P < 0.05) between values with and without P23 within a treatment.

Figure 6

Effects of P23 (0.05 mg dry weight/mL) on the growth of L. minor in sterile or non-sterile pond water for 15 days. (a) Changes in number of fronds growing in sterile (▪, □) or non-sterile (●, ○) pond water without (▪, ●, control) or with P23 cells (□, ○). (b) Biomass production (final minus initial dry weight) of L. minor in sterile or non-sterile pond water with or without P23 cells. Values are mean ± SD (n = 3). *Significant difference (P < 0.05) between dry weights.

Figure 6

Effects of P23 (0.05 mg dry weight/mL) on the growth of L. minor in sterile or non-sterile pond water for 15 days. (a) Changes in number of fronds growing in sterile (▪, □) or non-sterile (●, ○) pond water without (▪, ●, control) or with P23 cells (□, ○). (b) Biomass production (final minus initial dry weight) of L. minor in sterile or non-sterile pond water with or without P23 cells. Values are mean ± SD (n = 3). *Significant difference (P < 0.05) between dry weights.

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