Ice Party
ActiveLactuca sativa L. · Lettuce
Syngenta UK Ltd
NL
8 records
Variety traits
Heat tolerance of lettuce
Lactuca sativa L.
Heat tolerance of lettuce (thermotolerance) is the plant's ability to maintain normal growth and development at temperatures above 25–30 °C, preventing bolting and physiological leaf damage.
In the reference 7 varieties crop Lettuce, where this is mentioned in the description.
Evaluation of lettuce heat tolerance includes laboratory analysis of seed thermoinhibition by calculating the thermoinhibition coefficient, which is the ratio of germination at 30 °C to germination at 25 °C. Varieties with a high coefficient, close to unity, are considered the most thermotolerant. Physiological indicators such as mean germination time, chlorophyll fluorescence, and proline accumulation are also used.
In field and greenhouse conditions, resistance is determined by visual symptoms: the presence of tipburn, which is caused by disrupted calcium transport, and premature bolting. Important markers also include morphological changes, such as internode elongation and leaf blade deformation, which, in combination with damage scoring scales, allow for the assessment of the commercial suitability of varieties under heat stress conditions.
General information about the subject — on the page Heat tolerance.
Varieties of Lettuce mentioned in the description
Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.
Lalique
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
16 records
Sagess
ActiveLactuca sativa L. · Lettuce
Vilmorin-Mikado S.A.S.
CZ
FR
HR
HU
8 records
Tudela
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
ES
NL
7 records
Sierra
ActiveLactuca sativa L. · Lettuce
VILMORIN, S.A.
ES
FR
IT
7 records
Sangria
ActiveLactuca sativa L. · Lettuce
VILMORIN, S.A.
ES
FR
IT
7 records
Rouxai
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
FR
7 records
Justine
ActiveLactuca sativa L. · Lettuce
HM.CLAUSE
FR
IT
7 records
Glendana
ActiveLactuca sativa L. · Lettuce
Steven Mitchell, Daniel Trimboli, Enza Zaden Australia Pty Ltd
NL
6 records
Lital
ActiveLactuca sativa L. · Lettuce
VENTURA/AZOULAY/NETZER
BG
ES
6 records
Faustina
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
ES
FR
6 records
Extemp
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
8 records
Limor
ActiveLactuca sativa L. · Lettuce
The State of Israel - Ministry of Agriculture and Rural Development - Agricultural Research Organization (ARO)^^^Hazera (1939) Ltd.
NL
4 records
Great Lakes 118
ActiveLactuca sativa L. · Lettuce
BG
HR
IT
SI
8 records
Reglice
TerminatedLactuca sativa L. · Lettuce
Vilmorin-Mikado S.A.S.
FR
HR
4 records
Maravia
Application submittedLactuca sativa L. · Lettuce
Vilmorin-Mikado S.A.S.
CZ
FR
4 records
Carmen
ActiveLactuca sativa L. · Lettuce
Graines Gautier SA (FR)
FR
SK
6 records
SUCRINE
ActiveLactuca sativa L. · Lettuce
Domaine Public (FR)
FR
3 records
Paratie
TerminatedLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
FR
4 records
Deangelia
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
6 records
Contrai
ActiveLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel B.V.
NL
5 records
Casey
ActiveLactuca sativa L. · Lettuce
Enza Zaden Beheer
NL
7 records
Rubygo I
TerminatedLactuca sativa L. · Lettuce
Gautier Semences SAS (FR)
FR
2 records
Massimina
TerminatedLactuca sativa L. · Lettuce
Rijk Zwaan Zaadteelt en Zaadhandel BV (NL)
FR
3 records