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Electronic Journal of Biotechnology ISSN: 0717-3458
  © 2010 by Universidad Católica de Valparaíso -- Chile
Vol. 13 No. 1, Issue of January 15, 2010
 


Table 2. Relationship between cold injury, ice nucleation and freezing temperature in four Eucalyptus globulus genotypes subjected to different drought hardening regimes. Values are means of 5 replicates for the thermal analysis and 8 replicates for the LT50 ± 1 SE. Means with different letters are significantly different (P ≤ 0.05). Lower case letters compare nucleation and freezing temperatures (Columns and rows). Upper case letter compare only within the LT50 column. LT50 = lethal temperature for 50% of leaf cellular damage evaluated by relative conductivity; FS = freezing sensitive, FT = freezing tolerant.


Genotype

Hardening
regime
(MPa)

Nucleation
temperature
(ºC)

Freezing
temperature
(ºC)

LT50
(ºC)

Freezing
resistance
category

EG-13

-0.2

-7.3 ± 0.2 cd

-4.6 ± 0.2 efgh

-7.7 ± 0.2 E

FS

-1.8

-7.6 ± 0.3 d

-4.9 ± 0.1 fgh

-6.3 ± 0.2 BC

FS

-2.6

-5.8 ± 0.2 abc

-3.0 ± 0.2 e

-7.0 ± 0.3 CDE

FT

EG-23

-0.2

-7.3 ± 0.3 cd

-5.3 ± 0.4 gh

-7.6 ± 0.2 E

FS

-1.8

-7.0 ± 0.3 bcd

-5.6 ± 0.4 h

-6.0 ± 0.3 AB

FS

-2.6

-4.8 ± 0.3 a

-3.1 ± 0.2 e

-7.0 ± 0.2 CDE

FT

EG-22

-0.2

-6.5 ± 0.3 abcd

-4.6 ± 0.3 efgh

-6.8 ± 0.0 BCD

FS

-1.8

-6.8 ± 0.7 bcd

-5.1 ± 0.5 bgh

-6.7 ± 0.1 BCD

FS

-2.6

-5.4 ± 0.3 ab

-3.2 ± 0.6 ef

-6.7 ± 0.1 BCD

FT

EG-14

-0.2

-5.6 ± 0.3 abc

-3.3 ± 0.3 ef

-5.2 ± 0.0 A

FS

-1.8

-5.8 ± 0.3 abc

-3.9 ± 0.2 efgh

-7.4 ± 0.1 DE

FT

-2.6

-5.9 ± 0.5 abcd

-3.6 ± 0.4 efg

-6.6 ± 0.1 BCD

FS

 

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