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Table 1 Biomass, amylose (Am), and amylopectin (Ap) production in T. subcordiformis exposed to nitrogen deprivation under NICD and HICD conditions with GABA supply on Day 4

From: Fine-tuned regulation of photosynthetic performance via γ-aminobutyric acid (GABA) supply coupled with high initial cell density culture for economic starch production in microalgae

ICD

GABA (mM)

Biomass theoretical productivity (mg L−1 day−1)

Am/Ap ratio

Am content (%DW)

Am yield (g L−1)

Am theoretical productivity (mg L−1 day−1)

Ap content (%DW)

Ap yield (g L−1)

Ap theoretical productivity (mg L−1 day−1)

NICD

0

366.39 ± 54.20

0.51 ± 0.03

17.81 ± 0.34

0.46 ± 0.05

101.70 ± 11.80

32.79 ± 2.90

0.85 ± 0.13

166.92 ± 32.30

2.5

462.78 ± 43.41*

0.47 ± 0.03

20.22 ± 1.45

0.60 ± 0.06*

136.79 ± 16.18*

39.38 ± 8.94

1.17 ± 0.28

247.04 ± 69.28

5

462.22 ± 82.32*

0.42 ± 0.04**

18.52 ± 1.49

0.55 ± 0.11

124.76 ± 26.55

49.86 ± 4.79***

1.49 ± 0.30***

326.33 ± 73.99***

10

494.44 ± 32.50**

0.40 ± 0.01***

16.96 ± 2.61

0.52 ± 0.08

117.86 ± 21.14

51.39 ± 4.78***

1.59 ± 0.16***

351.87 ± 41.03***

HICD

0

274.72 ± 24.07

0.38 ± 0.02

14.84 ± 0.79

0.58 ± 0.04

68.13 ± 11.09

39.39 ± 3.91

1.55 ± 0.19

314.96 ± 46.55

2.5

316.11 ± 39.06

0.40 ± 0.01**

17.76 ± 3.10*

0.73 ± 0.15*

104.89 ± 37.87*

43.83 ± 7.27

1.80 ± 0.36

378.14 ± 90.08

5

293.89 ± 33.69

0.43 ± 0.01***

16.84 ± 0.97

0.68 ± 0.06

91.13 ± 15.52

39.26 ± 3.39

1.58 ± 0.19

321.38 ± 47.13

10

234.17 ± 27.57

0.42 ± 0.01***

14.56 ± 0.91

0.55 ± 0.03

59.27 ± 7.13

34.52 ± 2.02

1.30 ± 0.05

252.20 ± 13.09

  1. *, **, and *** denote the significant differences at p < 0.1, p < 0.05, and p < 0.01 levels, respectively, under different GABA conditions (2.5–10 mM) compared to those under 0 mM GABA (means ± SD, n = 3)