Skip to main content
. Author manuscript; available in PMC: 2014 Apr 9.
Published in final edited form as: Plant Cell Environ. 2011 Jun 20;34(9):1431–1442. doi: 10.1111/j.1365-3040.2011.02341.x

Table 2.

Double bond index (DBI) of membrane lipids in S. medusa and S.-L. linearifolia during high and low temperature alteration in alpine screes. DBI = (Σ[N × mol% lipid])/100, where N is the total number of double bonds in the two fatty acid chains of each glycerolipid molecule. The relative change (RC) in DBI from −3 to 32°C is the percentage value for the difference between the DBI at −3 and 32°C over the DBI at −3°C; the largest relative change (LRC) in DBI is the percentage value for the difference between the maximum and minimum DBI over the minimum DBI. Values in the same row line with different letters are significantly different (P < 0.05). Values are means ± SD (n = 5).

Lipid
class		 Plant species Double bond index RC
(%)		 LRC
(%)
−1°C −3°C 32°C 6°C −3 to
32°C
DGDG S. medusa 5.55 ± 0.08a 5.41 ± 0.15a 5.44 ± 0.21a 5.41 ± 0.17a 0.6 2.6
S.-L. linearifolia 5.30 ± 0.07a 5.29 ± 0.05a 5.26 ± 0.04a 5.30 ± 0.03a −0.6 0.8
MGDG S. medusa 5.93 ± 0.01a 5.90 ± 0.05ab 5.89 ± 0.05ab 5.86 ± 0.05b −0.2 1.2
S.-L. linearifolia 5.90 ± 0.02a 5.90 ± 0.01a 5.85 ± 0.01b 5.89 ± 0.01a −0.9 0.9
PA S. medusa 3.27 ± 0.46ab 3.65 ± 0.28a 2.83 ± 0.72b 2.98 ± 0.68ab −23 29
S.-L. linearifolia 3.61 ± 0.28a 3.73 ± 0.39a 3.09 ± 1.04a 3.79 ± 0.42a −17 23
PC S. medusa 4.10 ± 0.14b 4.26 ± 0.23ab 4.15 ± 0.07b 4.39 ± 0.11a −2.6 7.1
S.-L. linearifolia 3.80 ± 0.08b 3.93 ± 0.09a 3.80 ± 0.04b 3.78 ± 0.07b −3.3 4.0
PE S. medusa 3.45 ± 0.33b 4.07 ± 0.28a 4.08 ± 0.50a 3.19 ± 0.61b 0.2 28
S.-L. linearifolia 3.75 ± 0.05a 3.74 ± 0.05a 3.70 ± 0.02a 3.70 ± 0.05a −1.1 1.4
PS S. medusa 2.22 ± 0.77a 2.64 ± 0.27a 2.73 ± 0.38a 2.74 ± 0.40a 3.4 23
S.-L. linearifolia 2.96 ± 0.04c 3.12 ± 0.11ab 3.17 ± 0.04a 3.07 ± 0.08b 1.6 7.1
PI S. medusa 2.32 ± 0.02bc 2.43 ± 0.11a 2.31 ± 0.05b 2.36 ± 0.07ab −4.9 5.2
S.-L. linearifolia 2.80 ± 0.09b 2.87 ± 0.03ab 2.89 ± 0.02a 2.85 ± 0.03ab 0.7 3.2
PG S. medusa 3.09 ± 0.08a 2.88 ± 0.25a 2.92 ± 0.19a 2.89 ± 0.22a 1.4 7.3
S.-L. linearifolia 2.88 ± 0.08a 2.85 ± 0.06a 2.74 ± 0.07b 2.93 ± 0.06a −3.9 6.9
Total double bond index
Total lipids S. medusa 5.12 ± 0.09a 5.14 ± 0.10a 5.14 ± 0.05a 5.15 ± 0.06a 0.0 0.6
S.-L. linearifolia 5.03 ± 0.17a 5.05 ± 0.09a 4.95 ± 0.27a 5.12 ± 0.12a −2.0 3.4