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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