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Table 5 Double bond index (DBI) 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

  

DBI

   

PA

C. bifida

1.57 ± 0.40a

1.48 ± 0.09a

1.53 ± 0.05a

1.60 ± 0.23a

 

C. panzhihuaensis

1.87 ± 0.12b

2.02 ± 0.13a*

1.81 ± 0.07b*

1.95 ± 0.11ab*

PC

C. bifida

2.03 ± 0.30a

2.26 ± 0.32a

2.19 ± 0.21a

2.70 ± 0.35a

 

C. panzhihuaensis

2.84 ± 0.37b*

3.69 ± 0.14a*

2.43 ± 0.16b

2.55 ± 0.49b

PE

C. bifida

2.43 ± 0.38a

2.40 ± 0.22a

2.34 ± 0.08a

2.57 ± 0.09a

 

C. panzhihuaensis

3.08 ± 0.23b*

3.53 ± 0.22a*

2.92 ± 0.10b*

2.98 ± 0.29b*

PG

C. bifida

1.74 ± 0.23a

1.75 ± 0.19a

1.82 ± 0.10a

1.71 ± 0.06a

 

C. panzhihuaensis

1.69 ± 0.18c

1.97 ± 0.09ab

2.02 ± 0.03a*

1.85 ± 0.06b*

PI

C. bifida

1.65 ± 0.33a

1.51 ± 0.08a

1.59 ± 0.06a

1.48 ± 0.06a

 

C. panzhihuaensis

1.94 ± 0.08b

2.05 ± 0.08a*

2.09 ± 0.06a*

2.06 ± 0.04a*

PS

C. bifida

0.10 ± 0.02b

0.37 ± 0.13a

0.36 ± 0.16a

0.29 ± 0.04ab

 

C. panzhihuaensis

0.39 ± 0.25b

0.80 ± 0.18a*

0.10 ± 0.04c*

0.25 ± 0.20bc

Phospholipids

C. bifida

1.70 ± 0.35a

1.67 ± 0.12a

1.72 ± 0.10a

1.80 ± 0.06a

 

C. panzhihuaensis

2.10 ± 0.19b

2.50 ± 0.14a*

2.06 ± 0.05b*

2.13 ± 0.20b*

MGMG

C. bifida

1.58 ± 0.49a

1.92 ± 0.67a

2.03 ± 0.39a

1.44 ± 0.13a

 

C. panzhihuaensis

1.93 ± 0.18b

2.44 ± 0.22a

2.02 ± 0.23b

2.29 ± 0.40ab*

MGDG

C. bifida

4.53 ± 1.07a

4.70 ± 0.41a

4.80 ± 0.26a

4.08 ± 0.14a

 

C. panzhihuaensis

5.27 ± 0.13c

5.46 ± 0.08b*

5.77 ± 0.08a*

5.51 ± 0.13b*

DGDG

C. bifida

2.93 ± 0.44b

2.82 ± 0.26b

3.11 ± 0.33b

3.69 ± 0.12a

 

C. panzhihuaensis

3.35 ± 0.18c

3.88 ± 0.18a*

3.49 ± 0.06bc*

3.56 ± 0.13b

SQDG

C. bifida

6.96 ± 0.03a

6.95 ± 0.03a

6.95 ± 0.01a

6.97 ± 0.00a

 

C. panzhihuaensis

6.89 ± 0.09a

6.95 ± 0.03a

6.94 ± 0.01a

6.95 ± 0.01a*

Saccharolipids

C. bifida

5.56 ± 0.34ab

5.32 ± 0.24b

5.22 ± 0.06b

5.75 ± 0.09a

 

C. panzhihuaensis

5.55 ± 0.12a

5.51 ± 0.02a

5.84 ± 0.17a*

5.70 ± 0.36a

Total

C. bifida

3.99 ± 0.46ab

3.55 ± 0.16b

3.69 ± 0.30b

4.39 ± 0.17a

 

C. panzhihuaensis

4.55 ± 0.07b

4.79 ± 0.09a*

4.59 ± 0.06b*

4.72 ± 0.20ab*

  1. DBI = Σ(N× mol% lipid)/100, where N is the number of double bonds 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
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BMC Plant Biology

ISSN: 1471-2229

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