The acceptor side of photosystem II is damaged more severely than the donor side of photosystem II in ‘Honeycrisp’ apple leaves with zonal chlorosis

• Autorzy: Chen L.-S. , Cheng L.
• Języki publikacji: EN

Abstrakty

EN

To investigate the photoinhibition of photosynthesis in ‘Honeycrisp’ apple (Malus domestica Borkh. cv. Gala) leaves with zonal chlorosis, we compared pigments, CO₂ assimilation and chlorophyll (Chl) a fluorescence (OJIP) transient between chlorotic leaves and normal ones. Chl and carotenoids (Car) contents, Chl a/b ratio, and absorptance were lower in chlorotic leaves than in normal ones, whereas Car/Chl ratio was higher in the former. Although CO₂ assimilation and stomatal conductance were lower in chlorotic leaves, intercellular CO₂ concentration did not differ significantly between the two leaf types. Compared with normal leaves, chlorotic ones had increased deactivation of oxygen-evolving complexes (OEC), minimum fluorescence (Fₒ), dissipated energy, relative variable fluorescence at L-, W-, J- and I-steps, and decreased maximum fluorescence (Fm), maximum quantum yield for primary photochemistry (Fv/Fm or φRₒ/ABS), quantum yield for electron transport (ETₒ/ABS), quantum yield for the reduction of end acceptors of photosystem I (PSI) (uRo and REₒ/ABS), maximum amplitude of IP phase, amount of active photosystem II (PSII) reaction centers (RCs) per cross section (CS) and total performance index (PItot,abs). In conclusion, photoinhibition occurs at both the donor (i.e., the OEC) and the acceptor sides of PSII in chlorotic leaves. The acceptor side is damaged more severely than the donor side, which possibly is the consequence of over-reduction of PSII due to the slowdown of Calvin cycle. In addition to decreasing light absorptance by lowering Chl level, energy dissipation is enhanced to protect chlorotic leaves from photo-oxidative damage.

Słowa kluczowe

EN

photosystem II; Honeycrisp cultivar; apple; Malus domestica; leaf; chlorosis; chlorophyll a fluorescence; carbon dioxide assimilation; photoinhibition; photosynthesis

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2010
• Tom: 32
• Numer: 2
• Opis fizyczny: p.253-261,fig.,ref.

Twórcy

autor

Chen L.-S.

• Institute of Horticultural Plant Physiology, Biochemistry and Molecular Biology, Fujian Agriculture and Forestry University, 350002 Fuzhou, China
• College of Horticulture, Fujian Agriculture and Forestry University, 350002 Fuzhou, China
• Fujian Key Laboratory for Plant Molecular and Cell Biology, Fujian Agriculture and Forestry University, 350002 Fuzhou, China

autor

Cheng L.

• Department of Horticulture, Cornell University, Ithaca, NY 14853, USA

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