A chlorophyll fluorescence analysis of the allocation of radiant energy absorbed in photosystem 2 antennae of cotton leaves during exposure to chilling

Title:

A chlorophyll fluorescence analysis of the allocation of radiant energy absorbed in photosystem 2 antennae of cotton leaves during exposure to chilling

Creator:

Kornyeyev, D., Logan, B. A., and Holaday, A. S.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:f894f0cb-feda-4eb3-abd3-7adc575e985f
uuid:f894f0cb-feda-4eb3-abd3-7adc575e985f
issn:0300-3604
doi:10.1023/A:1020150408908

Subject:

energy dissipation, Gossypium hirsutum, low temperature, and photoinhibition

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

When dark-acclimated cotton (Gossypium hirsutum L. cv. Coker 312) leaves, pre-treated with lincomycin to inhibit chloroplast protein repair processes, were exposed to 10 °C and a PPFD of 500 μmol m-2 s-1, the proportion of excitation energy entering photochemistry (P) increased, but only to 5 % of the total energy absorbed at steady state levels of P, which were reached at 40 min of irradiation. Thermal dissipation (D) of absorbed energy increased throughout the 360 min irradiation period and accounted for the greatest portion of absorbed energy at 10 °C. When D was partitioned into constitutive (DCON), regulated (DREG), and photoinhibitory (DPI) components, it was primarily composed of DREG, the readily reversible portion of D. However, the induction of D was slow at 10 °C. Sixty minutes were required for D to reach 70 % of the energy absorbed. Considerable absorption of energy in excess of that utilized in photochemistry or dissipated thermally (designated as E) occurred, especially during induction of P and D. Over the irradiation period, the time-dependent averaged E exhibited an inverse, linear relationship with the ratio of variable (Fv) to maximum (Fm) fluorescence (PS2 efficiency) and a linear relationship with DPI. We propose that time-dependent averaged E may be useful for estimating the potential for damage to PS2 under stressful environmental conditions. and D. Kornyeyev, B. A. Logan, A. S. Holaday.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

77-84

Source:

Photosynthetica | 2002 Volume:40 | Number:1

Harvested from:

CDK

Metadata only:

false