The Photomorphogenic Signal: An Essential Component of Photoautotrophic Life

Iñigo, Sabrina; Barber, Mariana; Sanchez-Lamas, Maximiliano; Iglesias, Francisco Manuel; Cerdán, Pablo D.

doi:10.5772/29034

Cited by 1 publication

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References 114 publications

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“…Recently, we have demonstrated that leaves of barley and other plant species grown under monochromatic green light (GL) accumulated a large pool of geranylgeranyl-Chl a , Chl intermediates with incomplete hydrogenation of their phytyl chains (Materová et al 2017 ). The effect of GL on this step is surprising because in the Chl a synthesis pathway the only light-dependent process is the conversion of protochlorophyllide to chlorophyllide (Reinbothe et al 2010 ; Schoefs 1999 ; Iñigo et al 2012 ). After this step, two pathways leading to final production of Chl a have been described (Shpilyov et al 2005 ).…”

Section: Introductionmentioning

confidence: 99%

Accumulation of geranylgeranylated chlorophylls in the pigment-protein complexes of Arabidopsis thaliana acclimated to green light: effects on the organization of light-harvesting complex II and photosystem II functions

et al. 2021

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Light quality significantly influences plant metabolism, growth and development. Recently, we have demonstrated that leaves of barley and other plant species grown under monochromatic green light (500–590 nm) accumulated a large pool of chlorophyll a (Chl a) intermediates with incomplete hydrogenation of their phytyl chains. In this work, we studied accumulation of these geranylgeranylated Chls a and b in pigment-protein complexes (PPCs) of Arabidopsis plants acclimated to green light and their structural–functional consequences on the photosynthetic apparatus. We found that geranylgeranylated Chls are present in all major PPCs, although their presence was more pronounced in light-harvesting complex II (LHCII) and less prominent in supercomplexes of photosystem II (PSII). Accumulation of geranylgeranylated Chls hampered the formation of PSII and PSI super- and megacomplexes in the thylakoid membranes as well as their assembly into chiral macrodomains; it also lowered the temperature stability of the PPCs, especially that of LHCII trimers, which led to their monomerization and an anomaly in the photoprotective mechanism of non-photochemical quenching. Role of geranylgeranylated Chls in adverse effects on photosynthetic apparatus of plants acclimated to green light is discussed.

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