Effects and aftereffects of typical temperatures of cultivar habitat (background temperature), heat-hardening, and cold-hardening temperatures on dark respiration of leaf segments and intact plants were investigated on plant species differing in cold tolerance—cucumber (Cucumis sativus L.), tomato (Lycopersicon esculentum Mill.), cicer milkvetch (Astragalus cicer L.), and narrow-leaved lupine (Lupinus angustifolium L.). At cold-hardening temperatures, the respiratory metabolism underwent rearrangements serving to compensate for elevated energy losses during plant adaptation. This was manifested in the increase in the respiratory coefficient (RC) and the Q 10 coefficient during hardening. The preconditioning of plants at hardening temperatures enhanced O2 uptake and elevated the ratio of growth respiration to maintenance respiration in the post-treatment period. Conversely, temperature variations within the background range had no aftereffect on RC, Q 10, and O2 uptake.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 17, 2004
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