Biochemical and physiological characterization of three rice cultivars under different daytime temperature conditions

Heat stress due to high daytime temperatures is one of the main limiting factors in rice (Oryza sativa L.) yield in Colombia. Thus, the objective of the present research was to analyze the effect of three different daytime temperatures on the physiological responses of three Colombian rice cultivars...

Full description

Saved in:
Bibliographic Details
Published in:Chilean journal of agricultural research 2014-12, Vol.74 (4), p.373-379
Main Authors: Sánchez-Reinoso, Alefsi David, Garcés-Varón, Gabriel, Restrepo-Díaz, Hermann
Format: Article
Language:English
Subjects:
Acids
AGRICULTURE, MULTIDISCIPLINARY
AGRONOMY
Chlorophyll
Cultivars
Electrolytes
Heat
Lipids
Oxidation
Photosynthesis
Physiology
Respiration
Temperature
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Heat stress due to high daytime temperatures is one of the main limiting factors in rice (Oryza sativa L.) yield in Colombia. Thus, the objective of the present research was to analyze the effect of three different daytime temperatures on the physiological responses of three Colombian rice cultivars, thereby contributing to the knowledge of rice acclimation mechanisms. For 10 d, eight plants of each of the three cultivars were subjected daily to 5 h periods of 35 degrees Celsius and 40 degrees Celsius. The control treatment corresponded to normal growth conditions. Thermal stress was assessed based on a series of physiological and biochemical parameters. The 35 degrees Celsius treatment produced photosynthetic and respiratory differences in all three cultivars. At 40 degrees Celsius, F60 displayed the lowest photosynthetic rate and the highest respiratory rate. Although this cultivar experienced particularly strong electrolyte leakage and changes in proline when subjected to the high-temperature treatments, similar trends were observed in F733 and F473.
ISSN:0718-5839
0718-5820
0718-5839
DOI:10.4067/S0718-58392014000400001