biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 58:589-594, 2014 | DOI: 10.1007/s10535-014-0428-3

Effect of endophyte infection on chlorophyll a fluorescence in salinity stressed rice

X. M. Li1,*, M. J. Chen1, J. Li1, L. J. Ma1, N. Bu1, Y. Y. Li1, L. H. Zhang2,*
1 College of Chemistry and Life Science, Shenyang Normal University, Shenyang, P.R. China
2 Environmental Science Department of Liaoning University, Shenyang, P.R. China

We have earlier reported that the endophyte infection can enhance photosynthetic capacity and antioxidant enzyme activities in rice exposed to salinity stress. Now, the changes in primary photochemistry of photosystem (PS) II induced by Na2CO3 stress in endophyte-infected (E+) and endophyte-uninfected (E-) rice seedlings were studied using chlorophyll a fluorescence (OJIP-test). Performance indices (PIABS and PITotal) of E- and E+ rice seedlings revealed the inhibitory effects of Na2CO3 on PS II connectivity (occurrence of an L-band), oxygen evolving complex (occurrence of a K-band), and on the J step of the induction curves, associated with an inhibition of electron transport from plastoquinone A (QA) to plastoquinone B (QB). In E+ seedlings, Na2CO3 effects on L and K bands were much smaller, or even negligible, and also there was no pronounced effect on the J step. Furthermore, the OJIP parameters indicated that 20 mM Na2CO3 had a greater influence on the photosystem (PS) II electron transport chain than did the 10 mM Na2CO3, and that changes were greater in E- than in E+. Endophyte infection was therefore deemed to enhance the photosynthetic mechanism of Oryza sativa exposed to salinity stress.

Keywords: electron transport chain; Na2CO3; OJIP test; Oryza sativa; photosystem
Subjects: chlorophyll a fluorescence; salinity; endophyte infection; rice

Received: September 22, 2013; Revised: January 22, 2014; Accepted: January 24, 2014; Published: September 1, 2014  Show citation

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Li, X.M., Chen, M.J., Li, J., Ma, L.J., Bu, N., Li, Y.Y., & Zhang, L.H. (2014). Effect of endophyte infection on chlorophyll a fluorescence in salinity stressed rice. Biologia plantarum58(3), 589-594. doi: 10.1007/s10535-014-0428-3
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