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Changes in Organization of Activity of Photosystem II in Oat Leaves under Osmotic Stress

  • PLANT BREEDING, PLANT PROTECTION, AND BIOTECHNOLOGY
  • Published:
Russian Agricultural Sciences Aims and scope

Abstract

The parameters of chlorophyll α rapid fluorescence were assessed in husked oats (A. sativa subsp. sativa) and naked oats (A. sativa subsp. nudisativa). The goal of the study was to identify differences between two subspecies of oats with respect to the control of primary energy storage processes under the influence of osmotic stress for the subsequent selection of parameters and oat-breeding strategies to increase photosynthetic productivity in early drought conditions. Plants were grown on a complete Knop’s nutrient solution; osmotic stress was created by 10% polyethylene glycol (PEG‑400), and osmotic pressure was 0.709 mPa. Fluorescence parameters were determined using a Fluor Pen FP 110/S fluorometer (Photon Systems Instruments, Czech Republic). The data was processed by principal component analysis. In husked genotypes, the four main factors were responsible for 94.2% (control) and 91.4% (stress) variability of the assessed parameters. In naked oats, three principal factors were found (90.5% of variability) in the absence of stress and four factors (97.1% variability) under stress conditions. The flows of trapped energy (TR0/RC) and electronic transport (ET0/RC) were controlled in naked oat by one and the same factor under stress and by two different factors in the absence of stress, whereas those in husked genotypes were by one factor in the absence of stress and by two different factors under stress. Osmotic stress led to passing the control over adsorbed (ABS/RC) and trapped (TR0/RC) energy flows from one factor to two factors in husked oats but did not affect naked oats. The parameter of efficiency of electron transfer to the primary acceptors of photosystem I (δRE) was controlled by two different factors and enhanced their effect (factor loading from 0.564 to 0.74). Under stress, the δRE parameter weakened the effect of both factors in naked genotypes (factor loading –0.625 and ‒0.705) and reduced the effect of one factor and strengthened the second factor in husked genotypes (factor loading –0.552 and 0.687).

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This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.

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  1. Rudnitskii Federal Agricultural Research Center of the Northeast, 610007, Kirov, Russia

    S. A. Churakova, E. M. Lisitsyn & G. A. Batalova

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  1. S. A. Churakova
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  2. E. M. Lisitsyn
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  3. G. A. Batalova
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Correspondence to S. A. Churakova.

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Translated by E. Kuznetsova

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Churakova, S.A., Lisitsyn, E.M. & Batalova, G.A. Changes in Organization of Activity of Photosystem II in Oat Leaves under Osmotic Stress. Russ. Agricult. Sci. 49, 583–587 (2023). https://doi.org/10.3103/S106836742306006X

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