NDLI: Irreversible changes in barley leaf chlorophyll fluorescence detected by the fluorescence temperature curve in a linear heating/cooling regime

Content Provider	Springer Nature Link
Author	Frolec, J. Ilík, P. Krchňák, P. Sušila, P. Nauš, J.
Copyright Year	2008
Abstract	The chlorophyll fluorescence (F) temperature curves in a linear time-temperature heating/cooling regime were used to study heat-induced irreversible F changes in primary green leaves of spring barley (Hordeum vulgare L. cv. Akcent). The leaf segments were heated in a stirred water bath at heating rates of 0.0083, 0.0166, 0.0333, and 0.0500 °C s$^{−1}$ from room temperature up to maximal temperature T $_{m}$ and then linearly cooled to 35 °C at the same rate. The F intensity was measured by a pulse-modulated technique. The results support the existence of the two critical temperatures of irreversible F changes postulated earlier, at 45–48 and 53–55 °C. The critical temperatures are slightly dependent on the heating rate. Two types of parameters were used to characterize the irreversibility of the F changes: the coefficient of irreversibility μ defined as the ratio of F intensity at 35 °C at the starting/ending parts of the cycle and the slopes of tangents of linear parts of the F temperature curve. The dependence of μ on T $_{m}$ revealed a maximum, which moved from 54 to 61 °C with the increasing heating/cooling rate v from 0.0083 to 0.0500 °C s$^{−1}$, showing two basic phases of the irreversible changes. The Arrhenius and Eyring approaches were applied to calculate the activation energies of the initial increase in μ. The values varied between 30 and 50 kJ mol$^{−1}$ and decreased slightly with the increasing heating rate.
Starting Page	537
Ending Page	546
Page Count	10
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	46
Issue Number	4
e-ISSN	15739058
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-12-10
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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