Effects of different irradiances on the photosynthetic process during ex-vitro acclimation of Anoectochilus plantlets

Title:

Effects of different irradiances on the photosynthetic process during ex-vitro acclimation of Anoectochilus plantlets

Creator:

Pandey, D. M., Yu, K. W., Wu, R. Z., Hahn, E.-J., and Paek, K.-Y.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:72343786-f46c-4a85-a373-dcc6b89f96d2
uuid:72343786-f46c-4a85-a373-dcc6b89f96d2
issn:0300-3604
doi:10.1007/s11099-006-0045-2

Subject:

chlorophyll a fluorescence, electron transfer rate, photoinhibition, photosystem 2, ribulose-1,5-bisphosphate carboxylase, oxygenase, stomatal conductance, transpiration, and xanthophylls

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Six months old in vitro-grown Anoectochilus formosanus plantlets were transferred to ex-vitro acclimation under low irradiance, LI [60 µmol(photon) m-2 s-1], intermediate irradiance, II [180 µmol(photon) m-2 s-1], and high irradiance, HI [300 µmol(photon) m-2 s-1] for 30 d. Imposition of II led to a significant increase of chlorophyll (Chl) b content, rates of net photosynthesis (PN) and transpiration (E), stomatal conductance (gs), electron transfer rate (ETR), quantum yield of electron transport from water through photosystem 2 (ΦPS2), and activity of ribulose-1,5-bisphosphate carboxylase/ oxygenase (RuBPCO, EC 4.1.1.39). This indicates that Anoectochilus was better acclimated at II compared to LI treatment. On the other hand, HI acclimation led to a significant reduction of Chl a and b, PN, E, gs, photochemical quenching, dark-adapted quantum efficiency of open PS2 centres (Fv/Fm), probability of an absorbed photon reaching an open PS2 reaction centre (Fv'/Fm'), ETR, ΦPS2, and energy efficiency of CO2 fixation (ΦCO2/ΦPS2). This indicates that HI treatment considerably exceeded the photo-protective capacity and Anoectochilus suffered HI induced damage to the photosynthetic apparatus. Imposition of HI significantly increased the contents of antheraxanthin and zeaxanthin (ZEA), non-photochemical quenching, and conversion of violaxanthin to ZEA. Thus Anoectochilus modifies its system to dissipate excess excitation energy and to protect the photosynthetic machinery. and D. M. Pandey ... [et al.].

Language:

Multiple languages

Rights:

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

Coverage:

419-424

Source:

Photosynthetica | 2006 Volume:44 | Number:3

Harvested from:

CDK

Metadata only:

false