Abstract:
:Plants protect themselves against excessive light by the induction of Delta pH-dependent nonphotochemical quenching (qE) that is associated with de-epoxidation of violaxanthin (V) to zeaxanthin (Z) in thylakoid membranes. In this work, we report that low light (12 micromol photons m(-2) s(-1)) is sufficient for a marked stimulation of the V to Z conversion in shortly preheated wheat leaves (5 min, 40 degrees C), but without a substantial increase in qE. Re-irradiation of these leaves with high light led to a rapid induction of nonphotochemical quenching, implying a potential photoprotective role of low-light-induced Z in preheated leaves. On the contrary to low light conditions, preheated leaves exposed to high light behaved similar to nonheated leaves with respect to the V to Z conversion and qE induction. The obtained results indicate that low-light-induced lumen acidification in preheated leaves is high enough to activate V de-epoxidation, but not sufficiently high to induce the formation of quenching centers.
journal_name
Photochem Photobioljournal_title
Photochemistry and photobiologyauthors
Ilík P,Kotabová E,Spundová M,Novák O,Kana R,Strzałka Kdoi
10.1111/j.1751-1097.2009.00699.xsubject
Has Abstractpub_date
2010-05-01 00:00:00pages
722-6issue
3eissn
0031-8655issn
1751-1097pii
PHP699journal_volume
86pub_type
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