Photosynthetica, 2010 (vol. 48), issue 3

Photosynthetica 2010, 48(3):457-468 | DOI: 10.1007/s11099-010-0060-1

Influence of low temperatures on photosystem II photochemistry and expression of the NADPH:protochlorophyllide oxidoreductase in the alpine, subnival perennial, Chorispora bungeana

Y. H. Li1, Z. L. Sun1, X. L. Xu1, M. Jin1, Y. J. Liu1, H. Zhang1, L. Z. An1,*
1 Key Laboratory of Arid and Pasture Agroecology of Ministry of Education, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, P.R. China

Low temperature significantly influences chloroplast development and chlorophyll (Chl) biosynthesis, so effect of coldness on Chl content and Chl fluorescence characteristics was investigated in C. bungeana (Chorispora bungeana Fisch. & C.A. Mey). The levels of transcript and protein of an enzymatic step during Chl biosynthesis in response to chilling (4°C) and freezing (-4°C) were also examined in this work. Significant reduction in total Chl content was observed, but the reduction was much less at 4°C than that at -4°C. Moreover, the maximal quantum efficiency of photosystem II (PSII) photochemistry, indicated by Fv/Fm, decreased in the first 12 h, but then started to increase and reached higher levels than the control at 24 h and 48 h at 4°C, but decreased continuously at -4°C. Whereas quantum yield of PSII (ΦPSII) showed no significant difference between the chilling-stressed and the control seedlings, at -4°C, ΦPSII was markedly reduced with the prolonged treatment. In general, there were no significant responses of photochemical quenching (qP) and non-photochemical quenching (NPQ) to cold treatment. Meanwhile, the full-length cDNA of NADPH:protochlorophyllide oxidoreductase (POR, EC 1.3.1.33) was isolated and termed CbPORB (GenBank Accession No. FJ390503). Its transcript and protein content only slightly declined at 4°C, but dramatically reduced at -4°C with the time. These results strongly suggest that CbPORB possesses certain resistant characteristics and is a major player in Chl biosynthesis process involved in plant growth and development of C. bungeana under cold environmental conditions.

Keywords: chlorophyll biosynthesis; chlorophyll fluorescence; Chorispora bungeana; low temperature; NADPH: protochlorophyllide oxidoreductase

Received: January 31, 2010; Accepted: May 28, 2010; Published: September 1, 2010Show citation

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Li, Y.H., Sun, Z.L., Xu, X.L., Jin, M., Liu, Y.J., Zhang, H., & An, L.Z. (2010). Influence of low temperatures on photosystem II photochemistry and expression of the NADPH:protochlorophyllide oxidoreductase in the alpine, subnival perennial, Chorispora bungeana. Photosynthetica48(3), 457-468. doi: 10.1007/s11099-010-0060-1.
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