NDLI: Developmental changes in energy dissipation in etiolated wheat seedlings during the greening process

Content Provider	Springer Nature Link
Author	Garmash, E. V. Dymova, O. V. Malyshev, R. V. Plyusnina, S. N. Golovko, T. K.
Copyright Year	2013
Abstract	We studied the developmental changes in photosynthetic and respiration rates and thermal dissipation processes connected with chloroplasts and mitochondria activity in etiolated wheat (Triticum aestivum L., var. Irgina) seedlings during the greening process. Etioplasts gradually developed into mature chloroplasts under continuous light [190 μmol(photon) m$^{−2}$ s$^{−1}$] for 48 h in 5-day-dark-grown seedlings. The net photosynthetic rate of irradiated leaves became positive after 6 h of illumination and increased further. The first two hours of de-etiolation were characterized by low values of maximum (F$_{v}$/F$_{m}$) and actual photochemical efficiency of photosystem II (PSII) and by a coefficient of photochemical quenching in leaves. F$_{v}$/F$_{m}$ reached 0.8 by the end of 24 h-light period. During greening, energy-dependent component of nonphotochemical quenching of chlorophyll fluorescence, violaxanthin cycle (VXC) operation, and lipoperoxidation activity changed in a similar way. Values of these parameters were the highest at the later phase of de-etiolation (4–12 h of illumination). The respiration rate increased significantly after 2 h of greening and it was the highest after 4–6 h of illumination. It was caused by an increase in alternative respiration (AP) capacity. The strong, positive linear correlation was revealed between AP capacity and heat production in greening tissues. These results indicated that VXC in chloroplasts and AP in mitochondria were intensified as energy-dissipating systems at the later stage of greening (after 4 h), when most of prolamellar bodies converted into thylakoids, and they showed the greatest activity until the photosynthetic machinery was almost completely developed.
Starting Page	497
Ending Page	508
Page Count	12
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	51
Issue Number	4
e-ISSN	15739058
Language	English
Publisher	The Institute of Experimental Biology of the Czech Academy of Sciences
Publisher Date	2016-06-03
Publisher Place	Praha
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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