Heat tolerance and cold tolerance of cultivated potatoes measured by the chlorophyll-fluorescence method

Planta ◽  
1983 ◽  
Vol 159 (2) ◽  
pp. 119-124 ◽  
Author(s):  
Suzan E. Hetherington ◽  
Robert M. Smillie ◽  
P. Malagamba ◽  
Z. Huam�n
Keyword(s):  
Chlorophyll Fluorescence ◽  
Cold Tolerance ◽  
Heat Tolerance ◽  
Fluorescence Method ◽  
Cultivated Potatoes

Arboreality drives heat tolerance while elevation drives cold tolerance in tropical rainforest ants

Ecology ◽  
2021 ◽  
Author(s):  
Lily Leahy ◽  
Brett R. Scheffers ◽  
Stephen E. Williams ◽  
Alan N. Andersen
Keyword(s):  
Cold Tolerance ◽  
Heat Tolerance ◽  
Tropical Rainforest

Thermal diversity of North American ant communities: Cold tolerance but not heat tolerance tracks ecosystem temperature

2020 ◽  
Vol 29 (9) ◽  
pp. 1486-1494 ◽  
Author(s):  
Jelena Bujan ◽  
Karl A. Roeder ◽  
Kirsten Beurs ◽  
Michael D. Weiser ◽  
Michael Kaspari
Keyword(s):  
Cold Tolerance ◽  
Heat Tolerance ◽  
North American ◽  
Ant Communities ◽  
Thermal Diversity

scholarly journals Thermal tolerance patterns across latitude and elevation

2019 ◽  
Vol 374 (1778) ◽  
pp. 20190036 ◽  
Author(s):  
Jennifer Sunday ◽  
Joanne M. Bennett ◽  
Piero Calosi ◽  
Susana Clusella-Trullas ◽  
Sarah Gravel ◽  
...  
Keyword(s):  
Cold Tolerance ◽  
Heat Tolerance ◽  
Thermal Tolerance ◽  
Large Scale ◽  
Global Climate ◽  
Climate Extremes ◽  
Species Traits ◽  
Acclimation Temperature ◽  
Tolerance Limits ◽  
Thermal Limits

Linking variation in species' traits to large-scale environmental gradients can lend insight into the evolutionary processes that have shaped functional diversity and future responses to environmental change. Here, we ask how heat and cold tolerance vary as a function of latitude, elevation and climate extremes, using an extensive global dataset of ectotherm and endotherm thermal tolerance limits, while accounting for methodological variation in acclimation temperature, ramping rate and duration of exposure among studies. We show that previously reported relationships between thermal limits and latitude in ectotherms are robust to variation in methods. Heat tolerance of terrestrial ectotherms declined marginally towards higher latitudes and did not vary with elevation, whereas heat tolerance of freshwater and marine ectotherms declined more steeply with latitude. By contrast, cold tolerance limits declined steeply with latitude in marine, intertidal, freshwater and terrestrial ectotherms, and towards higher elevations on land. In all realms, both upper and lower thermal tolerance limits increased with extreme daily temperature, suggesting that different experienced climate extremes across realms explain the patterns, as predicted under the Climate Extremes Hypothesis . Statistically accounting for methodological variation in acclimation temperature, ramping rate and exposure duration improved model fits, and increased slopes with extreme ambient temperature. Our results suggest that fundamentally different patterns of thermal limits found among the earth's realms may be largely explained by differences in episodic thermal extremes among realms, updating global macrophysiological ‘rules’. This article is part of the theme issue ‘Physiological diversity, biodiversity patterns and global climate change: testing key hypotheses involving temperature and oxygen’.

Developing controlled environment screening for high-temperature tolerance in cotton that accurately reflects performance in the field

2012 ◽  
Vol 39 (8) ◽  
pp. 670 ◽  
Author(s):  
Nicola S. Cottee ◽  
Michael P. Bange ◽  
Iain W. Wilson ◽  
Daniel K. Y. Tan
Keyword(s):  
Chlorophyll Fluorescence ◽  
Gas Exchange ◽  
Cell Membrane ◽  
Heat Tolerance ◽  
Membrane Integrity ◽  
Screening Tools ◽  
Cultivar Differences ◽  
Physiological Performance ◽  
Cell Membrane Integrity ◽  
Multi Level

In this study we investigated the heat tolerance of high yielding Australian cotton (Gossypium hirsutum L.) cultivars using a multi-level approach encompassing physiological assays and measurements of performance. Two cultivars with known field performance were evaluated for heat tolerance under optimal (32°C) and high (42°C) temperatures in a growth cabinet with a cell membrane integrity assay. Impacts of temperature on growth were evaluated with leaf level measurements of gas exchange and chlorophyll fluorescence. To extend the multi-level approach, the expression of a Rubisco activase regulating gene (GhRCAα2) was also determined. Consistent with previously determined differences in the field, cultivar Sicot 53 outperformed Sicala 45 for the cell membrane integrity assay; this finding was reflective of cultivar differences in gas exchange and chlorophyll fluorescence. Cultivar differences were also consistent for expression of GhRCAα2, which may also help explain differences in physiological performance, particularly photosynthesis. This study reaffirmed that physiological and molecular assays were sufficiently sensitive to resolve genotypic differences in heat tolerance and that these differences translate to physiological performance. By comparing performance under high temperatures in the growth cabinet and field, this approach validates the use of rapid screening tools in conjunction with a multi-level approach for heat tolerance detection.

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