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Table 4 Acyl chain length (ACL) 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
   ACL    
PA C. bifida 35.26 ± 0.67b 35.03 ± 0.10b 35.08 ± 0.08b 35.91 ± 0.51a
  C. panzhihuaensis 36.36 ± 0.62a* 35.73 ± 0.16b* 35.70 ± 0.21b* 36.00 ± 0.32ab
PC C. bifida 34.99 ± 0.27b 34.89 ± 0.11b 34.99 ± 0.06b 35.50 ± 0.09a
  C. panzhihuaensis 35.13 ± 0.07b 35.11 ± 0.04b* 35.33 ± 0.10a* 35.12 ± 0.17b*
PE C. bifida 39.20 ± 4.61a 36.26 ± 0.37a 36.37 ± 0.16a 37.61 ± 0.98a
  C. panzhihuaensis 39.33 ± 2.02b 37.07 ± 0.81c 44.68 ± 1.23a* 40.04 ± 1.75b*
PG C. bifida 34.73 ± 0.78a 33.64 ± 0.19b 33.77 ± 0.07b 35.28 ± 0.55a
  C. panzhihuaensis 36.20 ± 1.43a 35.06 ± 0.58a* 35.93 ± 0.22a* 36.02 ± 0.65a
PI C. bifida 35.85 ± 1.97ab 34.41 ± 0.40b 34.96 ± 0.63ab 36.51 ± 0.25a
  C. panzhihuaensis 35.21 ± 0.83b 36.02 ± 0.54b* 38.27 ± 0.47a* 36.06 ± 0.72b
PS C. bifida 33.11 ± 0.02b 33.40 ± 0.11a 33.40 ± 0.18a 33.32 ± 0.04a
  C. panzhihuaensis 33.44 ± 0.28b 33.82 ± 0.15a* 33.10 ± 0.03c* 33.29 ± 0.25bc
Phospholipids C. bifida 36.04 ± 1.83a 34.81 ± 0.12a 35.03 ± 0.22a 36.43 ± 0.48a
  C. panzhihuaensis 36.25 ± 0.10b 36.03 ± 0.24b* 38.06 ± 0.52a* 36.49 ± 0.47b
MGMG C. bifida 17.23 ± 0.34a 17.41 ± 0.42a 17.50 ± 0.22a 17.15 ± 0.08a
  C. panzhihuaensis 17.41 ± 0.12b 17.70 ± 0.14a 17.49 ± 0.12ab 17.64 ± 0.24a
MGDG C. bifida 35.22 ± 0.53a 35.19 ± 0.16a 35.30 ± 0.07a 35.04 ± 0.07a
  C. panzhihuaensis 35.41 ± 0.25b 35.26 ± 0.05b 35.78 ± 0.03a* 35.66 ± 0.07a*
DGDG C. bifida 34.54 ± 0.23a 34.43 ± 0.24a 34.63 ± 0.18a 33.57 ± 0.46b
  C. panzhihuaensis 34.71 ± 0.07c 34.96 ± 0.05a* 34.87 ± 0.02b* 34.92 ± 0.10ab*
SQDG C. bifida 39.68 ± 0.36a 39.69 ± 0.30a 39.61 ± 0.04a 39.93 ± 0.01a
  C. panzhihuaensis 39.71 ± 0.11a 39.77 ± 0.11a 39.29 ± 0.30b 39.76 ± 0.06a*
Saccharolipids C. bifida 37.39 ± 0.29ab 36.94 ± 0.57b 36.75 ± 0.23b 37.52 ± 0.17a
  C. panzhihuaensis 36.91 ± 0.42a 36.19 ± 0.27b* 37.20 ± 0.38a 37.05 ± 0.71a
Total C. bifida 36.79 ± 0.75a 35.89 ± 0.20b 35.99 ± 0.11b 37.13 ± 0.23a
  C. panzhihuaensis 36.73 ± 0.57b 36.15 ± 0.22b 37.47 ± 0.28a* 36.89 ± 0.64ab
  1. ACL = (∑[n × mol % lipid])/100, where n is the number of acyl carbons in each lipid molecule. 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