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Modulated Sink-Source Interactions Preserve PSII Electron Transport from Senescence-Induced Inactivation in a Model System with Expanded Life Span Induced by Decapitation of Bean Plants

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Abstract

One Of The Approaches To Create Different Physiological States In Plants Of The Same Ontogenetic Age Is Decapitation, I.E. Removal Of The Top Stem Bud Without Or In Combination With Consecutive Removal Of Newly Appearing Leaves. This Decapitation Procedure Can Be Used To Produce A Model System For Investigation Of Defoliation, Which Is Often Induced By Various Factors As Insects, Herbivores, Hail, Etc. In This Study, The Decapitation Of Bean Plants Was Performed Immediately After The Appearance Of The First, Second, Third Or Fourth Composite Leaf. We Studied Also A Variant With Primary Leaves And Stem With Apical Bud, But Without Composite Leaves. Analyses Of Chlorophyll Fluorescence And Millisecond Delayed Fluorescence Of Primary Leaves Were Undertaken To Investigate Alterations In Photosystem Ii (Psii) Electron Transport During The Decapitation-Induced Delay Of Senescence In The Non-Detached Leaves. Analysis Of The Okjip Transient By The Jip-Test Showed An Increase In Several Biophysical Parameters Of Photosystem Ii In Decapitated Plants, Namely The Density Of Reaction Centers On A Crosssection Basis, The Yields For Trapping And Electron Transport, And The Performance Index. The Effects Were Mostly Expressed When All Leaves Except The Primary Leaves Were Detached. The Variant With A Preserved Apical Bud Showed Values Similar To Those Of Decapitated Plants With Primary Leaves Only. The Changes In The Induction Curves Of Delayed Fluorescence Also Indicated An Acceleration Of The Electron Transport Beyond Psii In The Decapitated Plants.

Keywords

  • Decapitated plants
  • Phaseolus vulgaris
  • variable chlorophyll a fluorescence
  • JIP-test
  • delayed fluorescence
  • electron transport
  • photosystem II

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  • DOI: 10.1007/978-1-4020-6709-9_152
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Yordanov, I., Goltsev, V., Chernev, P., Zaharieva, I., Stefanov, D., Strasser, R.J. (2008). Modulated Sink-Source Interactions Preserve PSII Electron Transport from Senescence-Induced Inactivation in a Model System with Expanded Life Span Induced by Decapitation of Bean Plants. In: Allen, J.F., Gantt, E., Golbeck, J.H., Osmond, B. (eds) Photosynthesis. Energy from the Sun. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6709-9_152

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