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Rice leaf heterogeneity in chlorophyll fluorescence parameters under short-term osmotic stress

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Biologia Plantarum

Abstract

The effects of short-term osmotic stress [a polyethylene glycol (PEG) treatment] on photosystem II (PS II) of upland and lowland rice seedlings were investigated using chlorophyll (Chl) fluorescence imaging. Spatial heterogeneity in the top fully expanded leaf for all Chl fluorescence parameters was found under stress conditions. After exposure to PEG, a decrease in the effective quantum yield of PS II photochemistry (φPS II) and photochemical quenching (qP), and an increase in non-photochemical quenching (NPQ) proceeded from the upper section to the base of the leaf. The most sensitive position in the leaf was different between the two ecotypes. Chl fluorescence parameters, net photosynthetic rates (PN), and stomatal conductance (gs) were more sensitive to the PEG stress in upland rice than in lowland rice. These results also indicate different leaf anatomy and development in the two rice ecotypes. Additionally, the findings suggest a more rapid stress response in upland rice.

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Abbreviations

ci :

intercellular CO2 concentration

gs :

stomatal conductance

NPQ:

non-photochemical quenching

PEG:

polyethylene glycol

PN :

net photosynthetic rate

PS II:

photosystem II

qP:

photochemical quenching

φPS II:

effective quantum yield of PS II photochemistry

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Authors and Affiliations

  1. Collaborative Innovation Center of Henan Grain Crops, Rice Engineer Center and Key Laboratory of Physiology, Ecology and Genetics Improvement of Food Crop in Henan Province, Henan Agricultural University, Zhengzhou, 450002, P.R. China

    J. Z. Li, Y. P. Chen, K. Q. Teng, L. Z. Qin, Y. X. Du, J. Zhang & Q. Z. Zhao

Authors
  1. J. Z. Li
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  2. Y. P. Chen
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  3. K. Q. Teng
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  4. L. Z. Qin
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  5. Y. X. Du
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  6. J. Zhang
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  7. Q. Z. Zhao
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Corresponding author

Correspondence to Q. Z. Zhao.

Additional information

Acknowledgements: This work was supported by the National Natural Science Foundation of China (31101132), the Key Public Welfare Scientific Research Project of Henan Province, and the Project of Construction Key Laboratory of Water-saving Agriculture of Zhengzhou City (121PYFZX185).

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Li, J.Z., Chen, Y.P., Teng, K.Q. et al. Rice leaf heterogeneity in chlorophyll fluorescence parameters under short-term osmotic stress. Biol Plant 59, 187–192 (2015). https://doi.org/10.1007/s10535-014-0481-y

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  • DOI: https://doi.org/10.1007/s10535-014-0481-y

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