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Table 3 The content of each main membrane lipid class in C. bifida and C. panzhihuaensis treated at low temperatures

From: Differences in lipid homeostasis and membrane lipid unsaturation confer differential tolerance to low temperatures in two Cycas species

Lipid class

Species

Treatment

  

Control

Cold

Freezing

Recovery

  

Lipid content (μmol/g FW)

  

Control

Cold

Freezing

Recovery

PA

C. bifida

0.74 ± 0.41b

1.81 ± 0.59a

1.27 ± 0.30ab

0.26 ± 0.06b

 

C. panzhihuaensis

0.30 ± 0.16a

0.42 ± 0.06a*

0.36 ± 0.05a*

0.35 ± 0.07a

PC

C. bifida

0.21 ± 0.09b

0.46 ± 0.17a

0.42 ± 0.08a

0.13 ± 0.02b

 

C. panzhihuaensis

0.26 ± 0.15b

0.41 ± 0.01a

0.15 ± 0.02b*

0.22 ± 0.12b

PE

C. bifida

0.10 ± 0.01c

0.22 ± 0.04a

0.17 ± 0.02b

0.06 ± 0.00d

 

C. panzhihuaensis

0.12 ± 0.06b

0.19 ± 0.04a

0.09 ± 0.02b*

0.10 ± 0.04b

PG

C. bifida

0.27 ± 0.09b

0.52 ± 0.17a

0.49 ± 0.05a

0.18 ± 0.02b

 

C. panzhihuaensis

0.32 ± 0.04a

0.28 ± 0.04ab*

0.19 ± 0.03c*

0.25 ± 0.02b*

PI

C. bifida

0.45 ± 0.15b

0.85 ± 0.21ab

1.06 ± 0.04a

0.23 ± 0.05b

 

C. panzhihuaensis

0.47 ± 0.10b

0.57 ± 0.08ab*

0.78 ± 0.30a

0.37 ± 0.08b*

PS

C. bifida

0.03 ± 0.01b

0.04 ± 0.01a

0.04 ± 0.00ab

0.02 ± 0.00c

 

C. panzhihuaensis

0.03 ± 0.01a

0.04 ± 0.00a

0.04 ± 0.01a

0.04 ± 0.00a*

MGMG

C. bifida

0.04 ± 0.01b

0.07 ± 0.02a

0.07 ± 0.02a

0.04 ± 0.01b

 

C. panzhihuaensis

0.08 ± 0.05b

0.17 ± 0.05a*

0.07 ± 0.02b

0.08 ± 0.02b*

MGDG

C. bifida

0.50 ± 0.10b

1.15 ± 0.57a

1.03 ± 0.22a

0.55 ± 0.10b

 

C. panzhihuaensis

1.25 ± 0.76b

2.64 ± 0.35a*

0.65 ± 0.21b*

1.02 ± 0.46b

DGDG

C. bifida

0.56 ± 0.07c

1.13 ± 0.23b

1.36 ± 0.11a

0.09 ± 0.01d

 

C. panzhihuaensis

0.80 ± 0.24b

1.39 ± 0.17a

0.84 ± 0.45b

0.84 ± 0.41b*

SQDG

C. bifida

1.53 ± 0.36b

1.99 ± 0.36a

2.00 ± 0.20a

1.04 ± 0.13c

 

C. panzhihuaensis

1.72 ± 0.39a

1.98 ± 0.17a

1.91 ± 0.50a

1.69 ± 0.41a*

Total

C. bifida

4.46 ± 0.99b

8.25 ± 2.34a

7.94 ± 0.90a

2.63 ± 0.28b

 

C. panzhihuaensis

5.37 ± 1.86b

8.12 ± 0.54a

5.14 ± 1.61b*

5.00 ± 0.76b*

  1. Different letters in the same row indicate significant differences between treatments within species and * indicates significant difference between species within treatment (P < 0.05). Data are mean ± standard deviation (n = 5)
  2. DGDG Digalactosyldiacylglycerol, MGDG Monogalactosyldiacylglycerol, MGMG monogalactosylmonoacylglycerol, PA Phosphatidic acid, PC Phosphatidylcholine, PE Phosphatidylethanolamine, PG Phosphatidylglycerol, PI Phosphatidylinositol, PS Phosphatidylserine, SQDG Sulphoquinovosyldiacylglycerol