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Photosynthetica

, Volume 52, Issue 1, pp 157–160 | Cite as

Photosynthesis, photosystem II efficiency, amino acid metabolism and ion distribution in rice (Oryza sativa L.) in response to alkaline stress

  • Z. -H. Wu
  • C. -W. Yang
  • M. -Y. Yang
Brief Communication

Abstract

Alkalies are important agricultural contaminants complexly affecting plant metabolism. In this study, rice seedlings were subjected to alkaline stress (NaHCO3:Na2CO3 = 9:1; pH 8.9) for 30 days. The results showed that stress mightily reduced net photosynthetic rate (P N), but slightly decreased transpiration rate and stomatal conductance. This indicated that decline of P N might be a result of nonstomatal factors. Alkaline stress caused a large accumulation of Na+ in leaves up to toxic concentration, which possibly affected chloroplast ultrastructure and photosynthesis. We found that alkaline stress reduced chlorophyll fluorescence parameters, such as ratios of Fv′/Fm′, Fv/Fm, photosystem (PS) II efficiency, and electron transport rates in rice plants, i.e. it influenced the efficiencies of photon capture and electron transport by PSII. This might be a main reason for the decrease of P N under such conditions. Deficiency of minerals could be another reason for the decline of P N. Alkaline stress lowered contents of N, K, Cu, Zn, P, and Fe in rice plants. In addition, the stress strongly affected metabolism of amino acids. This might be caused by imbalance in carbon metabolism as a result of photosynthesis reduction.

Additional key words

alkaline stress rice photosynthesis photosystem II efficiency amino acid metabolism 

Abbreviations

Ci

internal CO2 concentration

Chl

chlorophyll

E

transpiration rate

ETR

apparent rate of electron transport at the PSII level

Fv/Fm

maximum quantum yield of photosystem II

Fv′/Fm

efficiency of excitation capture by open PSII centres

gs

stomatal conductance

GDH

glutamate dehydrogenase

GS

glutamate synthetase

PN

net photosynthetic rate

PSII

photosystem II

ϕPSII

PSII efficiency

qN

nonphotochemical quenching

qP

photochemical quenching

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.Department of AgronomyJilin Agricultural UniversityChangchunJilin Province, China
  2. 2.Key Laboratory of Molecular Epigenetics of MOENortheast Normal UniversityChangchunJilin Province, China
  3. 3.School of Life ScienceJilin Agricultural UniversityChangchunJilin Province, China

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